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Signal
Symptom
H53
Substrate fault (Electrical current
sensing circuit)
*1. If the door is left open for more than 1 minute, this display occurs. (Applicable for FC Door, PC Door.)
*2. Regarding the motion time of the ice-separator motor, if the motion continues for 1 minute it will stop for 1 second, after which
it will revolve to the opposite way (normal motor action) for 5 seconds. After the protective cessation of the ice-separator
motor, it will start once again from the initial control. If the protective cessation occurs 4 times consecutively, then this indicator
will be displayed. (Refer to ice dispenser item.)
*3. If there is a fan motor malfunction code "Hi" after the 1 second period detection with the fan motor ON, it will turn OFF for 2
minutes. If it repeats 10 times, a display will appear. As for the cancellation with the fan motor ON, the fan motor's abnormal
code of "L" is detected at a 5-second intervals.
*4. With the fan motor ON, after 0.6 seconds the fan motor resolution frequency codes "Hi" or "Lo" is detected within 1.5 seconds.
This will cause the fan motor to be switched OFF 2 minutes from the time of detection and once it has detected this for more
than 60 times the display will be lit. (However, from the input of electrical power until the first defrost it will continue for more
than 10 times.)
*5. This indication display appears during defrost DEF < 0 °C with time-save repeated 3 times to complete.
*6. This indication display appears during defrost DEF < 0 °C with time-save repeated 3 times to complete.
*7. The completed DFP temperature from the PC defrost until prior to the commencement of the next PC defrost (excluding
during FC defrost) is detected. If it exceeds 10°C even once and this is detected 5 times consecutively, then it will be indicated
on the display.
*8. Inverter Protection Control
*9. Pertaining to the transmission between IC1 (main micro computer) and IC201 (inverter micro computer), if IC1's incoming
transmission does not activate for more than 1 hour, then this display is shown. For the transmission between IC1 (main
micro computer) and IC701 (operation micro computer) and at the time of power input, if IC701's incoming transmission is not
activated for more than 5 minutes then the indicator for this is displayed. (See below for reference).
*10. Display at time of IC1 (main micro computer) abnormality occurrence with its internal storage (memory) area initialization.
*11. H35 code is displayed that under the condition DEF temperature
cooling mode working time limit.
*12. At the time of self-diagnosis code (H40) detection, it indicates that since the compressor commenced normal activity within a
period of 48 hours, the detection occurred twice.
*13. At the start of the fan motor's power output, the FC fan's electrical power output is ON for 1 second: with the rotation
frequency command electric voltage being 0 volts using the rotation frequency code, the disconnection detection of the
rotation frequency command electric voltage code line is created. And by using the rotation frequency code with the rotation
detection per second and is assessed as being disconnected, it will appear only in the track record display.
Check point
1. Control PCB
42
Condition
Inverter circuit protection
system operation.
0°C and FCC temperature
Display release
Replace parts
0°C, detected 10 times with
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