Check code
Abnormal points and detection methods
Causes and checkpoints
(1) If TH4 falls into following temperature conditions;
●exceeds 105°C [221°F] continuously for 5 minutes
●exceeds 115°C [239°F]
TH4: Thermistor <Compressor>
LEV: Linear expansion valve
1. Malfunction of stop valve
2. Over-heated compressor operation caused by
shortage of refrigerant
3. Defective thermistor
4. Defective outdoor multi controller circuit board
5. LEV performance failure
6. Defective indoor controller board
7. Clogged refrigerant system caused by foreign
object
8. Refrigerant shortage
(Refrigerant liquid accumulation in compressor while
indoor unit is OFF/thermo-OFF.)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis
Remedy
1102
(U2)
Compressor temperature trouble
Yes
Yes
No
Yes
Yes
No
No
No
Is 5101 displayed when restarted?
Is the outdoor stop valve (liquid/gas)
fully open?
Is there refrigerant leak?
Is there any abnormality on
connectors/wires such as disconnection,
half-disconnection or breakage?
Check the connection for thermistor wiring
and indoor controller board connector.
Refer to the diagnosis of check code 5101.
Open the stop valve (liquid/gas) fully.
Repair the refrigerant leakage.
Connect the connector properly
(Repair or replace it in the case of
breakage).
(5101)
(1102)
(no leak)
Continue to the next page.
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