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23. SELF DIAGNOSTIC FUNCTION FOR MALFUNCTIONS DETECTION
EXPLAINATION OF SELF-DIAGNOSTIC FUNCTION
- Self-diagnostic function is the key for success of air conditioner operation.
- The printed circuit boards existing inside the indoor unit are equipped with self-diagnostic function
to detect malfunction and automatically stops the operation at the air conditioner.
- Once a malfunction is detected, the diagnostic control section will force the system mode to OFF
for 3 minutes. After the OFF delay, system mode releases and allowed returning to its normal state.
The system will be allowed to restart on its own.
The diagnostic control section will allow the system to fail 5 consecutive times before shutting
down the system.
If the system is performing an active defrost, both the compressor drive and reversing valve
malfunction test will be cancelled and reinitiated after the following compressor OFF-ON cycle.
-
The unit on lamp is scanned every half-second and the error codes are displayed by the flashing
frequency of unit on lamp. The error codes are displayed during SHUT-OFF (3 minutes off and after
the 5th retry failure).
Malfunction
Reason
Flashing
Frequency
Allowed
Modes
Return Air Sensor
3
Fan Only
Indoor Coil Sensor
4
Fan Only
Compressor Drive
9
Fan Only
Electronic Control PCB (EEPROM)
10
Fan Only
Notes :
1- Prior to the malfunction repair, disconnect the electrical mains supply by moving the circuit
breaker to OFF position.
2- After repairing the malfunction:
2-1 Press Reset button (3)
2-2 connect the electrical main supply by moving the circuit breaker to ON position
2-3 operate the air conditioner by using the wireless remote control.
1 : Green led flashes
if there is a malfunction
3 : Reset Button
1
3
Summary of Contents for 42QG18-C
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