Self Diagnostic Function For Malfunctions Detection - Carrier 53QG18-H Installation Manual

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).
Return Air Sensor
Indoor Coil Sensor
Compressor Drive
Electronic Control PCB (EEPROM)
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.
3
1
Malfunction
Reason
1 : Green led flashes
if there is a malfunction
3 : Reset Button
Flashing
Frequency
3
4
9
10
47
Allowed
Modes
Fan Only
Fan Only
Fan Only
Fan Only