Si12-411A Troubleshooting
Service Diagnosis 181
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 indoor unit icing protector is activated four times straight, the system will be shut down.
(The 4-time counter will reset itself if any of the following errors does not occur during the
compressor running time (total time): OL, radiation fin temperature rise, gas shortage, and
compressor startup.)
<Total 60 minutes>
Supposed
Causes
Wrong wiring or piping
Ev malfunctioning in each room
Short-circuit
Indoor unit heat exchanger thermistor defective
Indoor unit thermistor defective
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