Daikin F-Series, Service Manual

Page: 258 / 355

SiBE12-713 Troubleshooting
Service Diagnosis 247
5.10 Freeze-up Protection Control
Remote
Controller
Display
A5
Outdoor Unit LED
Display A
5
1
4
2
1
3
4
4
4
Method of
Malfunction
Detection 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
shut-down room.
Malfunction
Decision
Conditions In the cooling mode, the following conditions (A) and (B) are kept together for 5 minutes.
(A) Indoor unit heat exchanger temperature
≤
–1°C
(B) Indoor unit heat exchanger temperature
≤
Room temperature –10°C
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, gas shortage, and compressor startup.)
Supposed
Causes
„
Wrong wiring or piping
„
EV malfunctioning in each room
„
Short-circuit
„
Indoor unit heat exchanger thermistor defective
„
Room temperature thermistor defective