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TROUBLESHOOTING
1-32
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the thermistor is short-circuited (less than 0.24 k
Ω
) or cut (greater
than 840 k
Ω
) during the cooling or heating operation. The system is automatically restarted when
the fault is removed.
Alarm
Code
Abnormality of Thermistor for Indoor Unit Heat Exchanger
Gas Refrigerant Pipe Temperature (Gas Piping Thermistor)
Refer to page 1-30 for
thermistor resistance.
Yes
Yes
Connect it.
No
Faulty Thermistor
Faulty PCB
No
Is it connected to
THM5 of PCB?
Is resistance of THM5
between 0.24k
Ω
and
840k
Ω
?
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Thermistor
for Indoor Unit
Heat Exchanger
Gas Pipe Temp.
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to PCB.
Repair wiring and
connections.
Incorrect Connection
Replace PCB and
check operation.
Replace PCB if faulty.
Faulty PCB
Thermistor for
Heat Exchanger
Gas Pipe
In Case of 4-Way Cassette Type
Содержание Utopia PAS-3HVRG
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