JPH0828953A - Method and apparatus for discriminating cause of off signal of reheating water-flow detecting sensor of bath boiler - Google Patents

Abstract

PURPOSE:To discriminate and display a cause of an OFF signal when the OFF signal is output after a bath temperature keeping function operation is started from a water flow switch provided in a reheating circulating path of a bath boiler. CONSTITUTION:A bath reheating circulating path 3 and hot water supply means 4 are provided in an implement case 2. The path 3 is connected to the hot water supply tube of a hot water supply heat exchanger 14 by a hot water supply tube 23, and a hot water supply valve 24 is provided at the tube 23. When an OFF signal is output from a water flow switch 5 after a reheating circulating pump 7 is driven to start a bath temperature keeping function, the valve 24 is opened to guide the hot water of the exchanger 14 side to the path 3 via the tube 23, and supplied to the switch 5. When an ON signal is output from the switch 5, a bathtub 12 is decided to be vacant. When the OFF signal is output from the switch 5, the switch 5 itself is decided to be a trouble, and the decided result is distinctly displayed on the display of a remote controller 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for determining an off operation factor of a reheating water detection sensor for a bath cooker.

[0002]

2. Description of the Related Art FIG. 4 shows the system configuration of a conventional general bathtub 1 having a hot water supply function. In the figure, in the equipment case 2, a reheating circulation path 3 and a hot water supply means 4 are provided.
The reheating circuit 3 is provided with a running water switch 5 as a reheating water detection sensor for detecting the flow of the reheating hot water, and a bath temperature sensor 6 such as a thermistor for detecting the bath temperature. A reheating circulation pump 7 that circulates the reheating hot water and a reheating heat exchanger 8 that heats the circulating hot water are interposed. The forward pipe 10 and the return pipe 11 of the reheating circulation path 3 are connected to the side wall of the bathtub 12.

A reheating burner 13 is provided on the lower side of the reheating heat exchanger 8 so that the combustion flame of the reheating burner 13 heats the reheating heat exchanger 8.

As the running water switch 5, generally,
A swing type sensor as shown in FIG. 5 is used. This kind of running water switch 5 has a pin 28 inside the sensor chamber 27.
A rotatable support plate 30 is provided by the support plate 30.
The magnet 31 is disposed on the surface of the. When no water is flowing in the pipeline, the support plate 30 is stationary almost downward due to its own weight, and the magnet 31 is reed switch 32.
It is located away from. In this state, when hot water flows into the pipe, the hot water acts on the support plate 30, the support plate 30 rotates in the direction of the arrow in FIG. 5, and the magnet 31 contacts the reed switch 32 side. Maintain contact. As a result, the reed switch 32 outputs the ON signal of the flowing water detection signal.

The hot water supply means 4 comprises a hot water supply heat exchanger 14, a water supply pipe 15 is connected to the inlet side of the hot water supply heat exchanger 14, and a flow sensor 16 for detecting the flow rate of the supplied water is connected to the water supply pipe 15.
An incoming water temperature sensor 17 such as a thermistor for detecting the water supply temperature is provided.

A hot-water supply pipe 18 is connected to the outlet side of the hot-water supply heat exchanger 14, and the hot-water supply pipe 18 at the outlet side of the hot-water supply heat exchanger 14 detects the temperature of hot water discharged from the hot-water supply heat exchanger 14. A hot water temperature sensor 20 is provided. A hot water supply burner 21 is arranged below the hot water supply heat exchanger 14, and the hot water supply heat exchanger 14 is heated by the combustion flame of the hot water supply burner 21. Further, the hot water supply pipe 18, the reheating circulation pump 7 and the reheating heat exchanger 8 in the reheating circulation path 3
The pipe line 22 between is connected by a pouring pipe 23 for communication.
A pouring valve 24 such as a solenoid valve is interposed in the pouring pipe 23.

The temperature detection signals of the temperature sensors 6, 17 and 20, the running water detection signal of the running water switch 5, and the flow sensor
The 16 flow rate detection signals are applied to a control device 25, and a remote controller 26 is connected to the control device 25. This remote control 26 has a hot water supply operation button for instructing a hot water supply operation,
A reheating operation operation button for instructing a reheating operation, a button for instructing a water filling operation in the bathtub 12, a hot water supply temperature setting button for setting a hot water supply temperature, a bath temperature setting operation button for setting a bath temperature, and a bathtub Various buttons such as a water level setting button for designating a water level, and a display unit for displaying the command contents of each button, each detected temperature, and an error display such as a failure are provided.

The control device 25 includes sensors 5, 6, 16, 17,
Receiving signals such as 20 and signals from the remote controller 26, the hot water supply operation and the reheating operation are controlled according to a built-in sequence program.

That is, when a reheating operation command is given by the reheating operation button of the remote controller 26, a combustion fan (not shown) is rotationally driven to drive the reheating circulation pump 7. When the running water switch 5 detects the flow of the reheating circulating hot water from the bathtub 12, the reheating burner 13
Is ignited to perform burner combustion, and the circulating hot water is heated by the heat exchanger 8 to perform additional heating. When the bath temperature sensor 6 detects the temperature of the bath water equal to the bath set temperature, the reheating circulation pump 7 is stopped, the combustion of the reheating burner 13 is stopped, and the bath water reheating operation is performed. To stop.

When a hot water supply operation is commanded by the remote controller 26, a hot water supply tap (not shown) on the faucet side of the hot water supply pipe 18 is opened, and a flow rate detection signal is applied from the flow sensor 16, a combustion fan ( (Not shown) is rotated, the hot water burner 21 is burned to heat the water passing through the hot water heat exchanger 14 to hot water of a set temperature, and this hot water is supplied to a desired hot water supply place such as a kitchen through the hot water supply pipe 18. . Then, when the hot water tap is closed and an off signal is applied from the flow sensor 16, the hot water burner
The combustion of 21 is stopped and the hot water supply operation is ended.

When the operation of filling the bathtub 12 is instructed, the pouring valve 24 is opened, and the hot water produced on the side of the hot water supply heat exchanger 14 is introduced into the reheating circulation path 3 and the reheating circulation path 3 is supplied. Hot water is poured into the bathtub 12 through 3, and the bathtub 12 is filled with water.

[0012]

However, in this type of bath kettle, when the reheating operation is commanded and the reheating circulation pump 7 is driven to start reheating the hot water of the bathtub, the running water switch 5 is operated. When the off signal is output, the control device 25 detects that the flowing water switch 5 has failed because the flowing water switch 5 does not detect the flow of water although the reheating circulation pump 7 is being driven. When the judgment is made, the failure of the running water switch 5 is displayed on the display part of the remote controller 26, and the reheating burner 13 is not ignited and the reheating operation is stopped.

In this way, the remote control 26 has a running water switch 5
Is displayed and the reheating operation is not performed, so the bath user will request the repair station of the bath kettle manufacturer to repair the fault, but the repair worker will come to the site. As a result of conducting the reheating operation with the bath 12 not filled with water,
Even when the running water switch 5 started the reheating operation, it was found that the flow of water could not be detected and the OFF signal continued to be output from the running water switch 5, indicating a failure indication, and the running water switch 5 actually failed. Even if it is not done, there is a problem that the worker of the trouble repair is swayed by the useless repair work by displaying the trouble display of the running water switch 5.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to, when an off signal is output from the running water switch after the start of reheating operation, the off signal is caused by a failure. Whether it was issued or it was issued because the reheating operation was started when the bathtub was empty was displayed separately, and the failure display was displayed despite the fact that the running water switch was not broken, and the repair work It is an object of the present invention to provide a method and an apparatus for determining an off-operation factor of a reheating water detection sensor for a bath kettle that is not swayed by an erroneous display.

[0015]

In order to achieve the above object, the present invention is constructed as follows. That is, the method of the present invention, in the reheating circulation path connected to the bathtub, the reheating circulation pump for circulating driving the hot water of the bathtub, the reheating circulation water detection sensor for detecting the flow of the reheating circulation hot water, and the circulating hot water. In the bath kettle, which is equipped with a reheating heat exchanger that heats, the reheating circulation path is connected to a pouring pipe that guides the hot water from the hot water supply heat exchanger side through a pouring valve to the reheating circulation. After driving the pump to start the operation of reheating the hot water in the bathtub, when the off-heating recirculation hot water detection sensor outputs an off signal which is a non-detection signal for the reheating recirculation hot water, the reheating circulation pump is stopped and injected. Open the hot water valve, guide the hot water on the side of the hot water heat exchanger to the reheating circulation circuit, monitor the output signal of the reheating water detection sensor while passing water through the reheating water flow sensor, and the signal of the reheating water flow detection sensor is detected. When it is a signal, it is determined that the reheating water flow detection sensor is faulty and a fault is displayed, and when the reheating water flow detection sensor outputs an ON signal for water flow detection, it is determined that the bathtub is empty. Is configured to be displayed.

Further, the apparatus of the present invention includes a reheating circulation pump for circulating the hot water of the bathtub and a reheating circulation water detection sensor for detecting the flow of the reheating circulation hot water in the reheating circulation path connected to the bathtub. , A reheating heater for heating the circulating hot water is incorporated, and in this reheating circulation path, a pouring pipe for guiding the hot water of the hot water supply heat exchanger side is connected via a pouring valve, After starting the reheating operation of the bathtub hot water by driving the reheating circulation pump, the reheating circulation pump is stopped when the off signal, which is a non-detection signal of the reheating circulation hot water, is output from the reheating circulation water detection sensor. And open the pouring valve to guide the hot and cold water on the side of the hot water heat exchanger to the reheating circulation circuit to drive the hot water supply through the reheating water flow sensor and the hot water supply introduction means and the reheating water flow after the pouring valve is opened. Detection The output signal of the service is monitored, and when the output signal is an off signal, it is determined that the reheating water flow detection sensor has failed, and when the output signal of the reheating water flow detection sensor is an on signal for water flow detection, the bathtub is in an empty state. It is characterized in that it has a sensor-off factor discriminating section for judging and a display section for displaying the judgment result of the sensor-off factor judging section in a distinguishable manner.

[0017]

In the present invention having the above structure, when the reheating operation is commanded, the reheating circulation pump is driven, and the reheating operation is started, when the off signal is output from the reheating water detection sensor. , To determine whether the reheating water flow detection sensor itself is in a failed state, or whether the off signal is being output from the reheating water flow detection sensor because the reheating operation has started when the bathtub is empty. Then, the check operation is performed.

First, when an off signal is output from the reheating water detection sensor, the reheating circulation pump is stopped, the pouring valve is opened, and hot water on the side of the hot water supply heat exchanger is guided to the reheating circulation path. Pass the water in the pipeline where the reheating water sensor is installed. Due to this water flow, when the ON signal for running water detection is output from the additional heating water detection sensor, the additional heating water detection sensor is not a failure, and the OFF signal is output from the additional heating water detection sensor when the bathtub is empty. In this state, it is determined that the reheating operation has started, and the fact that the bathtub is empty is displayed on the display unit such as a remote controller. On the other hand, when the off signal is continuously output from the reheating water sensor even after passing hot water from the hot water supply heat exchanger side, it is determined that the running water sensor itself has failed and the failure display of the reheating water detection sensor is displayed. Is similarly displayed on the display unit such as a remote controller.

The user of the bath can easily know by seeing these displays whether the bathtub is empty or the additional reheating water detection sensor itself is in a failure state, and the user can quickly find out whether the bathtub is in the failed state. Can take measures.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same parts as those in the conventional example are designated by the same reference numerals, and the duplicate description thereof will be omitted.

FIG. 1 shows the system configuration of the bath in this embodiment. This embodiment is different from the conventional example in that a running water switch 5 as a reheating water flow detection sensor is provided in a pipe line 22 between the recharging circulation pump 7 discharge side of the reheating circulation path 3 and the reheating heat exchanger 8. A pouring pipe 23 is provided in the pipe line between the flowing water switch 5 and the reheating circulation pump 7.
And a device for determining the operating factor of the OFF signal of the water flow switch 5 is built in the control device 25, and the other configuration is the same as the conventional example.

FIG. 2 shows a block configuration of an apparatus for discriminating an OFF operation factor of the water flow switch 5 which is characteristic of the present embodiment. The signal input section 33, hot water supply / hot water introduction drive means 34,
The off-factor determining section 35 and the display section 36 are provided. The signal input unit 33, hot water supply hot water introduction drive means 34,
The off factor determination unit 35 is formed in the control device 25, and is a display unit.
36 is formed on the remote controller 26.

The signal input section 33 receives the running water detection signal of the running water switch 5, the signal of the remote controller 26 and the signal of the flow sensor 16, and outputs the corresponding signals to the hot water supply / hot water introduction drive means 34 and the off factor determining section. Add to 35.

The hot water supply / hot water introduction drive means 34 has a pump drive control section 37 and a pouring valve drive control section 38. When the pump drive control section 37 is instructed by the remote controller 26 to perform a reheating operation. The recirculation pump 7 is driven. On the other hand, after driving the reheating circulating pump 7, when the off signal which is a non-detection signal of the flowing water is added from the flowing water switch 5, the reheating circulating pump 7 is stopped. The pouring valve drive control unit 38 opens the pouring valve 24 when the pump drive control unit 37 confirms that the OFF signal is output from the water flow switch 5 and stops the reheating circulation pump 7. .

The off-factor determining section 35 receives the opening operation signal of the pouring valve 24 from the pouring valve drive control section 38, monitors the signal of the running water switch 5, and outputs the ON signal from the flow sensor 16. When the OFF signal continues to be output from the running water switch 5 despite the fact that it is present, it is determined that the running water switch 5 itself has failed, and a failure determination signal of the running water switch 5 is sent to the display unit 36. That is, when the pouring valve 24 is opened, water is supplied from the water supply pipe 15 to the hot water supply heat exchanger 14, the hot water supply burner 21 burns, and the hot water on the side of the hot water supply heat exchanger 14 is a pouring pipe 23 and a running water switch. 5 in order, and further passes through the reheating heat exchanger 8 and is dropped from the outward pipe 10 into the bath 12. Where the flow of hot and cold water passing through the running water switch 5 should normally be detected by the running water switch 5,
The fact that the OFF signal of the non-detection signal is output from the running water switch 5 means that the running water switch 5 itself has failed, and the OFF factor determination unit 35 determines that this is the failure of the running water switch 5 itself and the determination signal. Is added to the display unit 36.

On the other hand, when the ON factor, which is a flowing water detection signal, is received from the flowing water switch 5 after the pouring valve 24 is opened, the OFF factor discriminating section 35 has no malfunction in the flowing water switch 5 itself. After the reheating operation was started, the OFF signal was output from the running water switch 5 to determine that the reheating operation was started in an empty state in which the bathtub 12 was not filled with hot water, and The judgment signal is added to the display unit 36.

The display unit 36 displays the failure determination of the running water switch 5 and the empty bath determination based on the determination result of the off factor determination unit 35. This display method is performed by blinking or lighting a lamp, identifying display by color (color), and appropriately distinguishing display by symbols or messages on the liquid crystal screen.

This embodiment is constructed as described above,
Next, the operation of determining the OFF operation factor of the running water switch 5 will be described based on the flowchart of FIG. First, the reheating operation is turned on, and the reheating circulation pump 7 is driven on. Then, in step 102, it is determined whether or not an ON signal (flowing water detection signal) is applied from the running water switch 5. When an ON signal is applied from the running water switch 5, the combustion fan is rotated to burn the reheating burner 13 to heat the circulating hot and cold water in the bathtub 12 by the reheating heat exchanger 8 to perform the reheating. During this reheating, the temperature of the bath water is detected by the bath temperature sensor 6 in step 104, and it is determined in step 105 whether the detected temperature has reached the bath set temperature. The detected temperature is lower than the bath set temperature. During that time, the reheating operation is continued. When the detected temperature reaches the bath set temperature, it is determined that the bath is in the boiling state, and in step 106, the reheating circulation pump 7
To stop the reheating operation.

In step 102, the reheating circulation pump 7
When it is detected that the off signal is being output from the water flow switch 5 despite the fact that the
Stop reheating circulation pump 7 at 7. And pouring valve
24 is opened, and it is determined whether or not the ON signal of the flow rate detection signal is added from the flow sensor 16. When the ON signal is applied from the flow sensor 16, there is no accident of water interruption and
It means that water is being supplied through 15, and the water of this water is heated by the hot water heat exchanger 14 into hot water when passing through the hot water heat exchanger 14, and the hot water is passed through the pouring pipe 23. It enters into the reheating circulation path 3, flows through the running water switch 5 and the reheating heat exchanger 8 in order, and flows from the outward pipe 10 to the bath 12. In this operation state, in step 110, it is judged whether or not the ON signal is applied from the water flow switch 5. When the ON signal is applied from the running water switch 5, the running water switch 5 determines that there is no failure and is in a normal state, and after closing the pouring valve 24, in step 112, an empty bathtub is displayed on the display unit of the remote controller 26.

When it is detected in step 110 that the ON signal is not applied from the running water switch 5, that is,
When the OFF signal is continuously output from the running water switch 5, it is determined that the running water switch 5 itself is in a failure state, the pouring valve 24 is closed in step 113, and the running water switch 5 is displayed on the display section of the remote controller 26 in step 114. Display a fault.

The user of the bath can look at the display of the remote controller 26, and when the bathtub is empty, the bath can be filled with hot water and then reheated as needed to use the bath. If it is out of order, we will ask the after-sales service station for repair.

According to the present embodiment, when the off signal is output from the running water switch 5 after the reheating operation is started, the cause of the off operation of the running water switch 5 is due to a failure, or the bathtub Since it is automatically judged whether it is due to the empty state and the result is displayed, when the bathtub is empty, you can immediately start filling the bath and use the bath. The conventional inconvenience of not being able to use the bath without knowing it can be eliminated.

When the water flow switch 5 fails,
A request for repair is made to the after-sales service station, but the repair person can see the cause of the failure at a glance on the display of the remote controller 26, and immediately repair or replace the running water switch 5 to promptly take countermeasures against the failure. You can In the conventional example, an error may be simply displayed on the display unit of the remote controller 26, in which case the cause of the error must be investigated over a long period of time, and the cause of the error cannot be determined. Although it took a lot of hands, in this embodiment, when the reheating operation cannot be performed because the bathtub is empty, the user of the bath can immediately use the bath by seeing the display on the display and filling the bath with water. Since there is no need to request a repair request to the repair worker, it is very convenient that the repair worker is not swayed by the repair request even though the running water switch 5 itself is not broken.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, in the above embodiment, the swing-up running water switch 5 as shown in FIG. 5 is used as the reheating water flow detecting sensor, but it may be constituted by a flow sensor for detecting the flow rate. When the reheating water flow detection sensor is configured by a swing type water flow switch, the flowing water is detected only when the flow direction of the flow water flows in the same direction as the flow direction of the reheating circulation pump 7, and the reverse direction is detected. In the case of flow, as shown in FIG. 5, the magnet 31 separates from the reed switch 32,
Since the support plate 30 closes the pipeline opening 40, running water cannot be detected. From this, as shown in FIG. 1, it is necessary to connect the pouring pipe 23 to the upstream side of the running water switch 5, and as shown in FIG. 4 of the conventional example, the pouring pipe 23 is placed downstream of the running water switch 5. In the method of connecting 23, even if the pouring valve 24 is opened and the hot water on the hot water supply heat exchanger 14 side is reheated and guided to the circulation path 3, the flow of hot water cannot be detected by the running water switch 5. Therefore, when the hot water of the hot water supply heat exchanger 14 side is introduced to check the OFF operation factor of the running water switch 5, the pouring pipe 23 must be connected to the upstream side of the running water switch 5 as in this embodiment. There is.

On the other hand, when the reheating water flow detection sensor is constituted by a flow sensor, the flow of water, that is, the flow rate is detected by the flow sensor regardless of the direction of the flow of water, so the pouring pipe 23 Can be connected to either the upstream side or the downstream side of the flow sensor, and in the case of the conventional piping system shown in FIG. 4, the pouring valve 24 is opened to introduce hot water from the hot water heat exchanger 14 side. Then, it is possible to determine the off-operation factor of the reheating water flow detection sensor without any trouble.

However, the flow sensor is more expensive than the flowing water switch 5, and there is a problem that hair or the like is entangled in the impeller of the flow sensor. In this respect, the swing type flowing water switch 5 is cheap in price. Since the problem of hair entanglement hardly occurs, it is excellent in reducing the cost of the bathtub and facilitating maintenance.

In the above embodiment, the reheating heat exchanger 8 and the hot water supply heat exchanger 14 are housed in the equipment case 2 to form a combined reheating and hot water supply device. The exchanger 8 and the hot water supply heat exchanger 14 are configured as separate appliances housed in separate appliance cases, and the hot water supply pipe of the hot water supply device and the reheating circulation path 3 of the bath kettle are poured through a hot water supply valve 24. The present invention is also applied to a so-called automatic bathtub connected by 23.

Further, in the above embodiment, the running water switch 5 is used.
Although the determination result of the OFF operation factor is displayed on the display unit of the remote controller 26, this display unit may be provided on a portion visible from the outside such as the panel surface of the control device 25 or the instrument case 2.

Further, in the above embodiment, the running water switch 5 is used.
When determining the off operation factor of No., depending on whether the signal of the running water switch 5 is on or off after confirming that the on signal is output from the flow sensor 16 after opening the pouring valve 24. It was determined whether the bathtub 12 was empty or the flow switch 5 itself was defective, but without checking the signal of the flow sensor 16, the signal of the flow switch 5 was detected after the pouring valve 24 was opened. It may be possible to immediately determine the off operation factor of the water flow switch 5 depending on whether it is on or off. Normally, it is extremely rare to cut off the water after starting the reheating operation, and when the pouring valve 24 is opened, water is immediately passed from the hot water supply heat exchanger 14 side to the running water switch 5 side.
Even if the signal of 16 is not confirmed, the off operation factor of the water flow switch 5 can be determined without any trouble. However, as in the present embodiment, the flow sensor 16 confirms the water flow to determine the off-operation factor, so that the determination is not performed when the water is cut off, so avoid erroneous determinations due to water cutoff. You can

[0040]

According to the present invention, when an off signal is output from the reheating water detection sensor after the reheating operation is started, the off operation factor of the off signal is discriminated and displayed separately. Since the reheating operation is started when the bathtub is empty, the off signal is output from the reheating water detection sensor or the off signal is output due to the failure of the reheating water detection sensor itself. The distinction between hot and cold can be known by just looking at the display on the display, and the user of the bath can fill the bathtub with water without any trouble by noticing the mistake of starting reheating while the bathtub is empty. Since it is possible to use the bath, only when the reheating water flow detection sensor itself fails, the repair request will be sent to the service station etc. Do there is no fact that workers are swayed by the demands of work in spite of the running water detection sensor itself reheating has not failed.

Further, when repair is requested, it is possible to judge at a glance that the reheating water flow detection sensor itself has failed by looking at the display on the display section, and it is necessary to find out the cause of the failure over a long period of time. Is unnecessary, and the trouble repair work can be performed quickly.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of a bathtub including an off-operation factor determination device for a reheating water flow detection sensor according to the present invention.

FIG. 2 is a block configuration diagram of an off-operation factor determination device of a reheating water flow detection sensor of the same embodiment.

FIG. 3 is a flowchart of an operation of determining a turning-off operation factor of a flowing water switch in the present embodiment.

FIG. 4 is a system configuration diagram of a bathtub equipped with a conventional general hot water supply means.

FIG. 5 is an explanatory diagram of a general swing-type running water switch.

[Explanation of symbols]

 1 Bath Kettle 3 Reheating Recirculation Circuit 5 Flow Switch 7 Reheating Recirculation Pump 8 Reheating Heat Exchanger 14 Hot Water Heat Exchanger 23 Pouring Pipe 24 Pouring Valve 25 Control Device 34 Hot Water Hot Water Introducing Means 35 Off Factor Determining Section 36 Display

Claims (2)

[Claims] 1. A reheating circulation pump connected to the bathtub for reheating the hot water of the bathtub, a reheating circulation water detection sensor for detecting the flow of the reheating circulation hot water, and heating the circulation hot water. Drives the reheating circulation pump in a bath kettle in which a reheating heat exchanger is incorporated and a pouring pipe for guiding hot water from the hot water supply heat exchanger side is connected to the reheating circulation path via a pouring valve. After starting the reheating operation of the hot water in the bathtub, when the off signal, which is a non-detection signal for the reheating circulating hot water, is output from the reheating circulating water detection sensor, the reheating circulating pump is stopped and the pouring valve is turned on. Open, guide the hot water on the side of the hot water supply heat exchanger to the reheating circulation circuit, monitor the output signal of the reheating water detection sensor while passing through the reheating water sensor, and when the signal of the reheating water detection sensor is an off signal. Indicates that the reheating water flow detection sensor is faulty and displays a failure indication.When the reheating water flow detection sensor outputs an ON signal for water flow detection, it is determined that the bathtub is empty and a bath kettle is displayed to that effect. Method for determining the off-operation factor of the reheating water detection sensor of the above. 2. A reheating circulation pump connected to the bathtub for reheating the hot water of the bathtub, a reheating recirculation water detection sensor for detecting the flow of the reheating circulation hot water, and heating the circulation hot water. Drives the reheating circulation pump in a bath kettle in which a reheating heat exchanger is incorporated and a pouring pipe for guiding hot water from the hot water supply heat exchanger side is connected to the reheating circulation path via a pouring valve. After starting the reheating operation of the hot water in the bathtub, when the off signal, which is a non-detection signal for the reheating circulating hot water, is output from the reheating circulating water detection sensor, the reheating circulating pump is stopped and the pouring valve is turned on. Open the hot water supply heat exchanger side to the hot water circulation circuit to guide the hot water flow through the hot water flow sensor, and the hot water supply water introduction drive means and the output signal of the hot water flow detection sensor after the pouring valve is opened. monitor However, when the output signal is an OFF signal, it is determined that the reheating water flow detection sensor has failed, and when the output signal of the reheating water flow detection sensor is an ON signal for water flow detection, the bathtub is in an empty state. When,
An off-operation factor determining device for a reheating water detection sensor for a bathtub, which has a display section for displaying the determination result of the sensor-off factor determining section.