Freeze-Up Protection Control Or Heating Peak-Cut Control - Daikin SUPER MULTI NX CTXS07JVJU Service Manual

SiUS12-928_B
5.2

Freeze-up Protection Control or Heating Peak-cut Control

A5
Remote
Controller
Display
 Freeze-up protection control
Method of
Malfunction
Detection
 Heating peak-cut control
 Freeze-up protection control
Malfunction
Decision
 Heating peak-cut control
Conditions
 Short-circuited air
Supposed
 Clogged air filter of the indoor unit
Causes
 Dust accumulation on the indoor heat exchanger
 Defective indoor heat exchanger thermistor
 Defective indoor unit PCB
Service Diagnosis
During cooling operation, the freeze-up protection control (operation halt) is activated according
to the temperature detected by the indoor heat exchanger thermistor.
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.)
During cooling operation, the indoor heat exchanger temperature is below (32°F (0°C).
During heating operation, the indoor heat exchanger temperature is above 149°F (65°C).
Troubleshooting for Indoor Unit
148