Carrier 53KHET 30-36 - Self-Diagnostic Function; Understanding Self-Diagnostic Function; Malfunction Codes and Reasons

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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 of the air conditioner.
- Once a malfunction is detected, the display panel of the indoor unit will shows the malfunction type
through the indicator leads of display panel.
Display 30K Display 36K
Cool Only
Heat Pump
Hi Wall Split Systems
53KHET30-708F
53KHET36-708F
Hi Wall Split Systems
53QHET30-708F
53QHET36-708F
Malfunction
Reason
Malfunction
Reason
Return Air Sensor
( open or short circuit )
X X
Return Air Sensor
(open or short circuit)
X X
X
Indoor Coil Sensor
( open or short circuit )
X X
Indoor Coil Sensor
(open or short circuit)
X X X
Outdoor Unit Protection
Works
X
X
Outdoor Coil Sensor
(open or short circuit)
X X X
Compressor Overload
cuts out 4 times
Outdoor Unit
Protection Works
X X
Electronic Control PCB
( EEPROM error )
X
Compressor Overload
cuts out 4 times
Indoor Unit
Communication error
X
X
Electronic Control PCB
( EEPROM error )
X X
Refrigerant leak
X
Indoor Unit
Communication error
X X X
Leds Status Refers To Malfunction Reason
X = OFF
= Flash at 5Hz
= Flash continuously
Refrigerant leak
X
X
Leds Status Refers To Malfunction Reason
X = OFF
= Flash at 5Hz
= Flash continuously
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 connect the electrical main supply by moving the circuit breaker to ON position
2-2 operate the air conditioner by using the wireless remote control.