JP3993332B2 - Control device and control method for electric refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device and a control method for an electric refrigerator, and more particularly, to a control device and a control method for performing processing when an abnormality occurs or a failure is diagnosed in an electric refrigerator.
[0002]
[Prior art]
4 and 5 are a schematic diagram showing a schematic configuration of a general electric refrigerator and a control block diagram showing a circuit configuration, respectively. An electric refrigerator (hereinafter referred to as a refrigerator) 1 has, for example, a compressor 11 at the lower part thereof, a control board 12 at the back side thereof, and a buzzer device 13 at the upper part thereof, and an automatic ice maker in the cabinet. 14 and an operation panel 15 are provided. The control board 12 can be confirmed and handled by opening the lid on the back of the refrigerator body 10. On the other hand, the operation panel 15 can be confirmed and handled by opening the door 16 of the refrigerator body 10.
[0003]
The operation panel 15 includes a display unit 151 for displaying a result of the failure diagnosis and a result of the ice machine test, a temperature setting unit 152 for adjusting the internal temperature, and an ice making unit for starting the ice machine test process. A machine test input unit 153 is provided. The ice making machine test input unit 153 also serves as a failure diagnosis start input unit for performing a failure diagnosis process start operation.
[0004]
The control board 12 includes a control unit 17, a non-insulated inverter unit 18, and a transmission unit 19 for exchanging signals between the control unit 17 and the inverter unit 18. The control unit 17 includes a microcomputer 171 and an internal temperature detection unit 172 that detects the internal temperature. The inverter unit 18 includes a microcomputer 181, an inverter generation unit 182 that supplies power to the compressor 11, a rotation speed detection unit 183 that detects supply power of the inverter generation unit 182 in order to monitor the operation state of the compressor 11, and A failure display unit 184 for displaying details of an abnormality that has occurred in the compressor 11 is provided.
[0005]
The transmission unit 19 includes three photocouplers 191, 192, and 193. Two of the photocouplers 191 and 192 are used to transmit an operation command from the microcomputer 171 of the control unit 17 to the microcomputer 181 of the inverter unit 18. The remaining one photocoupler 193 is for transmitting a signal notifying the occurrence of abnormality of the compressor 11 from the microcomputer 181 of the inverter unit 18 to the microcomputer 171 of the control unit 17.
[0006]
Here, the operation command is an instruction that instructs whether to set or change the operation state of the compressor 11 to high speed, medium speed, low speed, or stop.
[0007]
The buzzer device 13 has a buzzer substrate 131. The microcomputer 171 is connected to the display unit 151, the temperature setting unit 152, the ice making machine test input unit 153, the buzzer substrate 131, the internal temperature detection unit 172, and the photocouplers 191, 192, and 193. On the other hand, the microcomputer 181 is connected to three photocouplers 191, 192, 193, an inverter generation unit 182, a rotation speed detection unit 183, and a failure display unit 184.
[0008]
Next, the operation of the refrigerator 1 will be described. FIG. 6 is a flowchart showing the control when the refrigerator 1 is operating normally. First, the microcomputer 171 of the control unit 17 compares the internal temperature detected by the internal temperature detection unit 172 with the temperature set by the user in the temperature setting unit 152 of the operation panel 15 (step S1). Based on the result, it is determined whether the compressor 11 is to be operated in a high speed operation, a medium speed operation, a low speed operation or an operation stop (step S2).
[0009]
For example, when the internal temperature is remarkably higher than the set temperature, the operation pattern of the compressor 11 is set to high speed operation, and when the internal temperature is slightly higher, the medium speed operation is set, and the temperatures are substantially the same. Operates at low speed and stops operation when the internal temperature is lower than the set temperature.
[0010]
When the operation pattern is determined, the microcomputer 171 encodes the operation command into a 2-bit signal and transmits it to the microcomputer 181 of the inverter unit 18 via the photocouplers 191 and 192 of the transmission unit 19 (step S3). The photocouplers 191 and 192 are insulated by light transmission (the same applies to the photocoupler 193).
[0011]
The control so far is performed by the microcomputer 171 of the control unit 17. The control described below is performed by the microcomputer 181 of the inverter unit 18.
[0012]
In the inverter unit 18, the microcomputer 181 receives the operation command signal sent from the microcomputer 171 of the control unit 17, decodes it and obtains the operation command (step S 4), and the compressor 11. The current state is acquired from the rotation speed detection unit 183 (step S5).
[0013]
When the operation command is any of high speed operation, medium speed operation, and low speed operation when the compressor 11 is stopped (step S6), the microcomputer 181 executes the start sequence to start the compressor 11. (Step S7). The rotational speed detection unit 183 detects the operating state of the compressor 11, and based on the detection result, the microcomputer 181 corrects the rotational speed of the compressor 11 by feedback-controlling the inverter generation unit 182 (step S8). ), The process is terminated.
[0014]
If it is determined in step S6 that the operation command is stopped when the compressor 11 is stopped, the process proceeds to step S8, where it is confirmed that the number of rotations of the compression 11 is zero or zero. Exit.
[0015]
On the other hand, when the compressor 11 is operating in step S5 and the operation command is stopped (step S9), the microcomputer 181 controls the inverter generator 182 to stop the compressor 11 (step S9). In step S10, the process proceeds to step S8, where it is confirmed that the number of rotations of the compression 11 has become zero, and the process ends.
[0016]
In step S9, if the driving command is any one of high-speed driving, medium-speed driving, and low-speed driving, the process proceeds to step S8, and the rotational speed of the compression 11 is corrected so that the driving state corresponding to the driving command is obtained. ,finish.
[0017]
FIG. 7 is a flowchart showing control during failure diagnosis of the refrigerator 1. When the operation command from the control unit 17 is switched from stop to high speed operation, medium speed operation, or low speed operation, and the stopped compressor 11 is started in accordance with the start sequence, the rotation speed detection unit 183 causes the compressor 11 to The microcomputer 181 of the inverter unit 18 confirms that the rotational speed of the compressor 11 is normal based on the detection result (step S11).
[0018]
If there is an abnormality in the compressor 11, the microcomputer 181 controls the inverter generator 182 to immediately stop the compressor 11 (step S12). The microcomputer 181 controls the photocoupler 193 of the transmission unit 19 to transmit an abnormality occurrence signal to the microcomputer 171 of the control unit 17 and generates a display signal corresponding to the content of the abnormality that has occurred, and displays it as a failure display. The information is sent to the unit 184 (step S13), and the failure display unit 184 displays information corresponding to the abnormality content (step 14). The abnormality occurrence signal is merely a binary signal that only informs the controller 17 of the occurrence of the abnormality, and does not inform the abnormality content.
[0019]
The control so far is performed by the microcomputer 181 of the inverter unit 18. The control described below is performed by the microcomputer 171 of the control unit 17.
[0020]
In the control unit 17, when receiving the abnormality occurrence signal sent from the microcomputer 181 (step S15), the macro computer 171 switches the operation command to stop (step S16). Thereby, the compressor 11 stops according to steps S5, S9, S10, and S8 of FIG.
[0021]
The failure diagnosis of the refrigerator 1 is performed when a user or the like (including a technician who performs repair or the like) inputs diagnosis start from the ice making machine test input unit 153 of the operation panel 15. If the compressor 11 stops abnormally, the interior of the refrigerator will not cool down, so the user etc. will perform a failure diagnosis.
[0022]
When the microcomputer 181 receives a diagnosis start signal from the ice making machine test input unit 153 (step S17), the microcomputer 181 performs a failure diagnosis for the internal temperature detection unit 172 and the automatic ice making machine 6 (step S18). If there is an abnormality (step S19), the microcomputer 181 generates a display signal corresponding to the abnormality content and sends it to the display unit 151, where the display corresponding to the abnormality content is performed (step 20). The process is terminated.
[0023]
If it is determined in step S11 that the rotation speed of the compressor 11 is normal, steps S12, S13, and 14 are skipped. If no abnormality occurrence signal is sent to the macro computer 171 of the control unit 17 in step S15, the process proceeds to step S17 to determine whether a diagnosis start signal is input from the ice making machine test input unit 153. . If the diagnosis start signal is not input, the process is terminated. If there is no abnormality as a result of the failure diagnosis in step S19, the process is terminated.
[0024]
[Problems to be solved by the invention]
However, in the conventional refrigerator 1, the abnormality of the compressor 11 is displayed on the failure display unit 184, which must be confirmed from the back side of the refrigerator body 10, while the internal temperature detection unit 172 and the automatic ice maker 6. Is displayed on the display unit 151 provided in the cabinet, the repair of the refrigerator 1 must be performed while checking the two display units 184 and 151. Has the disadvantage of being bad.
[0025]
Moreover, since the refrigerator 1 is usually arranged with the back surface of the room wall with a slight gap or without a gap, it is necessary to move the refrigerator 1 in order to check the failure display portion 184. However, in addition to the refrigerator itself being heavy, there are also disadvantages in that it is a heavy labor to move because various items stored in the cabinet are relatively heavy.
[0026]
The present invention has been made to solve the above-mentioned problems, and it is possible to display a compressor abnormality display and a failure diagnosis result display at the same place, and if possible, control from the front side of the refrigerator. The object is to obtain a device.
[0027]
It is another object of the present invention to obtain an electric refrigerator control method for displaying a compressor abnormality display and a failure diagnosis result display at the same location.
[0028]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a compressor of an electric refrigerator or a detection unit that detects an abnormality of an inverter unit that supplies power to the compressor, and the compressor or the inverter unit based on the output of the detection unit. When the diagnosis start is input from the first control unit that determines the abnormality content, generates and outputs a pattern signal corresponding to the determined abnormality content, and the ice machine test input unit, the automatic ice maker performs failure diagnosis, and the failure A second control unit that displays information based on a diagnosis result on a display unit installed in a place that can be confirmed from the front side of the electric refrigerator, and the first control unit controls the second control unit. the product output pattern signal anda photocoupler for transmitting to said second control unit, the second control unit, the compressor or in receiving said pattern signal from said first control unit With decrypt the abnormal content of over data unit, displays the information based on the abnormality Contents that the decrypted by an input from the icemaker test input unit on the display unit.
[0029]
According to this invention, when the abnormality of the compressor or the inverter unit is detected by the detection unit, the first control unit generates a pattern signal corresponding to the detected abnormality content and performs the second control on the pattern signal. send the part, while the second control unit that has received the pattern signal, as well as decrypt the abnormal content of the compressor or the inverter unit performs fault diagnosis of the automatic ice maker, a compressor or inverter abnormal content and automatic Information based on the failure diagnosis result of the ice making machine is displayed on a display unit installed in a place where it can be confirmed from the front side of the refrigerator .
[0030]
To achieve the above object, the present invention is at least Upon controlling the electric refrigerators having two control unit, the inverter unit for supplying electric power to the compressor or the compressor, the compressor start-up abnormality of the inverter generator a step of detecting an abnormality or compressor speed abnormality, in the first control unit, and generating a pattern signal corresponding to the detected the abnormal content, the second controller from the first controller diagnosis start of the pattern signal and transmitting the photo-coupler, from said at second control unit, a step of decrypting the abnormal content of the compressor or an inverter unit receiving the pattern signal, ice machine test input portion check and performing failure diagnosis of the automatic ice maker, the information based on the decrypted the abnormal content and the failure diagnosis result, from the front side of the refrigerator in the second control unit by the input And a step of displaying on the same display unit which is installed in a place that can, a.
[0031]
According to this invention, when the compressor start-up abnormality, the inverter generation part abnormality, and the compressor rotation speed abnormality are detected in the compressor or the inverter unit, the first control unit displays the pattern signal corresponding to the detected abnormality content. Is transmitted to the second control unit, while the second control unit decodes the received pattern signal to obtain the abnormal content of the compressor or the inverter unit, and from the ice machine test input unit. The automatic ice maker trouble diagnosis is performed by the diagnosis start input, and information based on the abnormal contents of the compressor or inverter and the result of the trouble diagnosis is displayed on the same display unit installed in a place where it can be confirmed from the front side of the refrigerator. To do.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Below, the refrigerator concerning embodiment of this invention is demonstrated. In addition, since the schematic structure of a refrigerator is the same as that of the general refrigerator shown in FIG. 4, description is abbreviate | omitted.
[0033]
FIG. 1 is a control block diagram showing a circuit configuration of the refrigerator according to the embodiment of the present invention. The refrigerator includes an operation panel 2 including a display unit 21, a temperature setting unit 22, and an ice machine test input unit 23, a control board 3 including a control unit 4, an inverter unit 5, and a transmission unit 6, a compressor 7, and A buzzer substrate 8 is provided. The control unit 4 includes a microcomputer 41 that is a second control unit and an internal temperature detection unit 42, and the inverter unit 5 detects a microcomputer 51 that is a first control unit, an inverter generation unit 52, and a detection unit. And a rotation number detection unit 53, and the transmission unit 6 includes three photocouplers 61, 62, and 63.
[0034]
Although the display part 21 displays the information based on the abnormal content and failure diagnosis result of the compressor 7 or the inverter part 5, it does not specifically limit, For example, the position which can be confirmed from the front side of a refrigerator (inside and outside of a warehouse) May be provided).
[0035]
Therefore, in the present embodiment, since the information on the abnormality content of the compressor 7 or the inverter unit 5 is displayed on the display unit 21, the failure display unit (see FIG. 5) provided in the conventional inverter unit is provided. Absent. Of course, in addition to the display unit 21, a failure display unit may be provided in the inverter unit 5.
[0036]
When an abnormality occurs in the compressor 7 or the inverter unit 5, the microcomputer 51 generates a pattern signal 50 corresponding to the abnormality content and outputs the pattern signal 50 to the photocoupler 63. The photocoupler 63 transmits the pattern signal 50 from the microcomputer 51 to the microcomputer 41.
[0037]
The microcomputer 41 decodes the pattern signal 50 received from the microcomputer 51 and acquires the abnormal content 40 of the compressor 7 or the inverter unit 5. The microcomputer 41 also performs failure diagnosis as usual. Then, the microcomputer 41 transmits the abnormality content 40 and the failure diagnosis result 49 of the compressor 7 or the inverter unit 5 to the display unit 21.
[0038]
The operation command is transmitted from the microcomputer 41 of the control unit 4 to the microcomputer 51 of the inverter unit 5 from the temperature setting unit 22, the ice making machine test input unit 23, the internal temperature detection unit 42, the inverter generation unit 52, the rotation number detection unit 53, and the control unit 4. The two photocouplers 61 and 62, the compressor 7 and the buzzer board 8 are respectively connected to the conventional temperature setting unit 152, ice machine test input unit 153, internal temperature detection unit 172, and the like described with reference to FIG. Since it is the same as that of the inverter generation part 182, the rotation speed detection part 183, the photocouplers 191, 192, the compressor 11, and the buzzer board 131, description is abbreviate | omitted.
[0039]
Next, although the operation of the refrigerator will be described, the control when the compressor 7 that is stopped or in operation is operated or stopped is the same as the conventional control shown in FIG.
[0040]
FIG. 2 is a flowchart showing the control at the time of failure diagnosis in the present embodiment. When the operation command from the control unit 4 is switched from stop to high speed operation, medium speed operation, or low speed operation, and the stopped compressor 7 is started according to the start sequence (or every predetermined time, or always), The rotation speed detection unit 53 detects the operating state of the compressor 7. Then, based on the detection result, the microcomputer 51 of the inverter unit 5 confirms that the operation of the inverter unit 5 is normal, that is, “no abnormality”, and performs a predetermined pulse corresponding to no abnormality. A pattern signal, that is, a pattern signal 50 is converted.
[0041]
In addition, when the rotation speed detection unit 53 does not operate even when the compressor 7 is started (this is referred to as “compressor start-up abnormality”), the rotation speed detection unit 53 is defined regardless of the execution of the inverter output. Is not input (this is referred to as “inverter generation unit abnormality”), the rotational speed of the compressor 7 detected by the rotational speed detection unit 53 during the operation of the compressor 7 is within a predetermined range (30 rps to 70 rps). If it does not fall within the range (this is referred to as “compressor rotation speed abnormality”), the microcomputer 51 converts the pattern signal 50 into a predetermined pattern signal 50 corresponding thereto (step S101).
[0042]
An example of the pattern signal 50 is shown in FIG. Although not particularly limited, in the illustrated example, the pattern signal 50 is defined by the number of pulses. For example, in the case of “no abnormality”, the number of pulses is zero, that is, no pulse is transmitted, and “compressor startup abnormality” The number of pulses is 1, the number of pulses is 2 in the case of “inverter generating part abnormality”, and the number of pulses is 3 in the case of “compressor rotation speed abnormality”.
[0043]
Returning to FIG. 2, the microcomputer 51 controls the photocoupler 63 of the transmission unit 6 to transmit the pattern signal 50 to the microcomputer 41 of the control unit 4 (step S102).
[0044]
The control so far is performed by the microcomputer 51 of the inverter unit 5. The control described below is performed by the microcomputer 41 of the control unit 4.
[0045]
In the control unit 4, when the macro computer 41 receives the pattern signal 50 sent from the microcomputer 51 (step S103), the macro computer 41 decodes the pattern signal 50 to obtain the failure content 40 of the compressor 7 or the inverter unit 5, Is stored in a random access memory (RAM) in the microcomputer 41 (step S104). This RAM is omitted in FIG.
[0046]
For example, according to the example shown in FIG. 3, the failure content 40 of the compressor 7 or the inverter unit 5 obtained by decoding the pattern signal 50 is “no abnormality” when the number of pulses of the pattern signal 50 is zero, “Compressor start-up abnormality” is “2”, “Inverter generating part abnormality”, and “3” is “Compressor rotation speed abnormality”. These are represented by, for example, a 2-bit binarized signal, “No abnormality” is “00”, “Compressor start error” is “01”, “Inverter generation error” is “10”, “Compressor rotation speed” “Abnormal” is set to “11”, and the 2-bit signal is stored in the RAM.
[0047]
When a user or the like inputs diagnosis start from the ice machine test input unit 23 of the operation panel 2, the microcomputer 41 of the control unit 4 performs a fault diagnosis on the internal temperature detection unit 42 and the automatic ice machine, The result 49 is stored in the RAM in the microcomputer 41 (step S105).
[0048]
Subsequently, the microcomputer 41 determines the display unit 21 of the operation panel 5 based on the two diagnostic results stored in the RAM, that is, the abnormality content 40 of the compressor 7 or the inverter unit 5 and the failure diagnosis result 49 of the automatic ice making machine. The pattern to be displayed is determined (step S106), the display unit 221 is controlled to display the contents informing the two diagnosis results (step S107), and the process is terminated. If the user or the like does not input a diagnosis start from the ice making machine test input unit 23 in step S105, the process ends.
[0049]
According to the above embodiment, when any one of the compressor start abnormality, the inverter generation unit abnormality, or the compressor rotation speed abnormality is detected, the microcomputer 51 of the inverter unit 5 responds to the detected abnormality content. The pattern signal 50 is changed to be transmitted to the microcomputer 41 of the control unit 4 via the photocoupler 63 of the transmission unit 6, and the microcomputer 41 receives the pattern signal 50, decodes it and decodes it to the compressor 7 or the inverter unit. 5, the failure diagnosis is performed, and information based on the abnormality content 40 of the compressor 7 or the inverter unit 5 and the failure diagnosis result 49 is displayed on the display unit 21 of the operation panel 2. 7 or the abnormality content 40 of the inverter unit 5 and the failure diagnosis result 49 can be displayed on the same display unit 21.
[0050]
And in the said embodiment, if the display part 21 exists in the place which can be confirmed from the front side of a refrigerator, the display of the abnormality content 40 of the compressor 7 or the inverter part 5 and the display of the failure diagnosis result 49 will be shown from the front side of a refrigerator. Can be confirmed.
[0051]
In the above, the present invention may define the pattern signal 50 by the pulse length. For example, when the pulse length is “no abnormality”, it is zero (that is, no pulse is transmitted), when “compressor start-up abnormality” is 1 μs, when “inverter generation part is abnormal”, 2 μs, In the case of “machine rotation speed abnormality”, 3 μs may be used.
[0052]
Further, it detects that the refrigerator is turned on, and automatically starts failure diagnosis of the compressor 7 and the inverter unit 5 and failure diagnosis of the automatic ice making machine when the power is turned on, and displays two diagnosis results. 21 may be displayed.
[0053]
【The invention's effect】
As described above, according to the control device of the present invention, when the abnormality of the compressor or the inverter unit is detected by the detection unit, the first control unit outputs the pattern signal corresponding to the detected abnormality content. Is transmitted to the second control unit via the transmission unit, while the second control unit receiving the pattern signal decodes the abnormal contents of the compressor or the inverter unit and In order to perform failure diagnosis and display information based on the abnormality content of the compressor or inverter and the failure diagnosis result of the automatic ice maker on the same display unit installed in a place where it can be confirmed from the front side of the refrigerator, The abnormality display of the inverter unit and the display of the failure diagnosis result of the automatic ice maker can be displayed at the same place. It can display unit to confirm the location near as they may be confirmed from the front side of the refrigerator, and a display of the compressor or of the inverter fault display and fault diagnosis result of the automatic ice maker of the refrigerator in the front side.
[0054]
Further, according to the control method of the present invention, when the compressor start-up abnormality, the inverter generation part abnormality or the compressor rotation speed abnormality is detected in the compressor or the inverter unit, the first control unit detects the detected abnormality. Generate a pattern signal according to the content and send it to the second control unit, while the second control unit decodes the received pattern signal to obtain the abnormal content of the compressor or inverter unit, and To diagnose the failure of an automatic ice maker and display information based on the abnormal contents of the compressor or inverter and the failure diagnosis result of the automatic ice maker on the same display unit installed at a location where it can be confirmed from the front side of the refrigerator The abnormality display of the compressor or the inverter and the display of the failure diagnosis result of the automatic ice maker can be displayed at the same location on the front side of the refrigerator .
[Brief description of the drawings]
FIG. 1 is a control block diagram showing a circuit configuration of a refrigerator according to an embodiment of the present invention.
FIG. 2 is a flowchart showing control at the time of failure diagnosis in the present embodiment.
FIG. 3 is a chart showing an example of a pattern signal in the present embodiment.
FIG. 4 is a schematic diagram showing a schematic configuration of a general electric refrigerator.
FIG. 5 is a control block diagram showing a circuit configuration of a general electric refrigerator.
FIG. 6 is a flowchart showing control when the refrigerator 1 is operating normally.
FIG. 7 is a flowchart showing control during failure diagnosis of the refrigerator 1;
[Explanation of symbols]
2 operation panel, 21 display unit, 4 control unit, 41 microcomputer (second control unit), 5 inverter unit, 51 microcomputer (first control unit), 53 rotational speed detection unit (detection unit), 6 transmission Part 7, compressor.

Claims (3)

A detection unit for detecting an abnormality of the inverter supplying power to the electric refrigerators compressor or the compressor,
A first control unit that determines an abnormality content of the compressor or the inverter unit based on an output of the detection unit, and generates and outputs a pattern signal corresponding to the determined abnormality content;
When the diagnosis start is input from the ice making machine test input unit, the automatic ice maker is subjected to a failure diagnosis, and information based on the failure diagnosis result is displayed on a display unit installed in a place where it can be confirmed from the front side of the electric refrigerator. A second control unit;
A photocoupler that is controlled by the first control unit and that transmits the pattern signal generated and output by the first control unit to the second control unit;
Comprising
Said second control unit is configured to decrypt the abnormal content of said compressor receives the pattern signal or the inverter section from the first control unit, an error that the decryption by an input from the icemaker test input unit electric refrigerator control unit and displaying the information based on the contents on the display unit. The detection unit is a rotation number detection unit that detects an operating state of the compressor, and the first control unit detects the rotation number detection unit when the rotation number detection unit does not operate even when the compressor is started. When it is determined that the compressor has started abnormally and the inverter output is executed, if a prescribed signal is not input to the rotational speed detection unit, it is determined that the inverter generation unit is abnormal, and the rotational speed is detected during operation of the compressor. When the rotation speed of the compressor detected by the detection unit does not fall within a predetermined range, it is determined that the compressor rotation speed is abnormal, and a pattern signal corresponding to the determined abnormality content is generated and output. The control apparatus of the electric refrigerator of Claim 1. In controlling an electric refrigerator having at least two control units,
The inverter supplying power to the compressor or the compressor, the compressor start-up abnormality of the steps of detecting the inverter generator outage or compressor speed abnormality,
At first controller, and generating a pattern signal corresponding to the detected the abnormal content,
And transmitting the pattern signal by photo-coupler from the first controller to the second controller,
In the second control unit, a step of decrypting the abnormal content of the compressor or an inverter unit receiving the pattern signal,
A step of performing a fault diagnosis of the automatic ice maker in the second control unit by a diagnosis start input from the ice machine test input unit ;
Information based on decrypted the abnormal content and the fault diagnosis result, and displaying the same display unit which is installed in a place that can be confirmed from the front side of the refrigerator,
The control method of the electric refrigerator characterized by including.

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