Si10-417
Troubleshooting
Service Diagnosis
25
5.1.2 Freeze-up Protection Control or High
Pressure Control
Remote
Controller
Display
A5
Method of
Malfunction
Detection
High pressure control (heat pump model only)
During heating operations, the temperature detected
by the indoor heat exchanger thermistor is used for
the high pressure control (stop, outdoor fan stop, etc.)
The freeze-up protection control (operation halt) is
activated during cooling operation according to the
temperature detected by the indoor unit heat
exchanger thermistor.
Malfunction
Decision
Conditions
High pressure control
During heating operations, the temperature detected
by the indoor heat exchanger thermistor is above
65°C
Freeze-up protection
When the indoor unit heat exchanger temperature is
below 0°C during cooling operation.
Supposed
Causes
Operation halt due to clogged air filter of the indoor
unit.
Operation halt due to dust accumulation on the indoor
unit heat exchanger.
Operation halt due to short-circuit.
Detection error due to faulty indoor unit heat
exchanger thermistor.
Detection error due to faulty indoor unit PCB.
Si10-417.fm Page 25 Wednesday, September 22, 2004 6:38 PM
