Freeze-Up Protection Control Or Heating Peak-Cut Control - Daikin 3MKS50E3V1B Service Manual

Troubleshooting for RA Indoor Unit - FTXG, FTXS, CTXS, FVXG, FVXS, FLXS, FDXS Series
5.2 Freeze-up Protection Control or Heating Peak-cut
Control
A5
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
272
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 temperature detected by the indoor heat exchanger thermistor
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
SiBE121135
Service Diagnosis