Specifications

SiBE04-624 Troubleshooting
Service Diagnosis 151
2.8 Peak-cut Control or Freeze-up Protection
Remote
Controller Display
A5
Method of
Malfunction
Detection

Peak-cut control (high pressure control)
During heating operation, the temperature detected by the indoor heat exchanger thermistor
is used for the high pressure control (stop, outdoor fan stop, etc.).

Freeze-up protection control (operation halt) is activated during cooling operation according
to the temperature detected by the indoor heat exchanger thermistor.
Malfunction
Decision
Conditions

Peak-cut control
On heating operation, when indoor heat exchanger temperature is about 65°C or more

Freeze-up protection
On cooling operation, indoor heat exchanger temperature is 0°C or less
Supposed
Causes

Halt due to dirty indoor unit filter

Halt due to dirty indoor heat exchanger

Halt due to short circuit

Faulty detection due to defective indoor heat exchanger thermistor

Reheating dehumidification solenoid valve remains closed (on cooling operation)

Faulty detection due to defective indoor unit PCB