Freeze-Up Protection Control Or Heating Peak-Cut Control - Daikin 2MXS40H2V1B Service Manual

Troubleshooting for RA Indoor Unit
5.2 Freeze-up Protection Control or Heating Peak-cut
Control
A5
Error Code
Method of Error
Detection
Error Decision
Conditions
Supposed
Causes
159
Freeze-up protection control
During cooling operation, the freeze-up protection control (operation halt) is activated
according to the temperature detected by the indoor heat exchanger thermistor.
Heating peak-cut control
During heating operation, the indoor heat exchanger temperature is used for the heating
peak-cut control (operation halt, outdoor fan stop, etc.)
Freeze-up protection control
During cooling operation, the indoor heat exchanger temperature is below 0°C.
Heating peak-cut control
During heating operation, the indoor heat exchanger temperature is above 65°C.
Short-circuited air
Clogged air filter of the indoor unit
Dust accumulation on the indoor heat exchanger
Defective indoor heat exchanger thermistor
Defective indoor unit PCB
SiBE121123_A
Service Diagnosis