Freeze-Up Protection Control - Daikin D Series Service Manual

Troubleshooting
4.6

Freeze-up Protection Control

A5
Remote
Controller
Display
Method of Indoor unit icing, during cooling operation, is detected by checking the temperatures sensed by
the indoor unit heat exchanger thermistor and room temperature thermistor that are located in a
Malfunction
shut-down room.
Detection
At another room (the indoor unit is normal), "
Malfunction In the cooling mode, the following conditions (A) and (B) are kept together for 5 minutes.
(A) Indoor unit heat exchanger temperature
Decision
(B) Indoor unit heat exchanger temperature
Conditions
If the freeze-up protection control is activated 4 times continuously, the system will be shut
down.
(The 4-time counter will reset itself if any of the following errors does not occur for 60 minutes.
: OL, radiation fin temperature rise, insufficient gas, and compressor lock.)
Supposed
Causes
142
Wrong wiring or piping
EV malfunctioning in each room
Short-circuit
Indoor unit heat exchanger thermistor abnormality
Room temperature thermistor abnormality
UH
" is displayed on the remote controller.
≤
–1°C
≤
Room temperature –10°C
SiBE12-519
Service Diagnosis