Check code
Abnormal points and detection methods
Causes and checkpoints
(1) If TH4 falls into following temperature conditions;
●exceeds 110 [230°F] continuously for 5 minutes
●exceeds 125 [257°F]
(2) If a pressure detected by the high pressure sensor and converted to
saturation temperature exceeds 40 [104°F] during defrosting, and
TH4 exceeds 110 [230°F].
TH4: Thermistor <Compressor>
LEV: Electronic expansion valve
Malfunction of stop valve
Over-heated compressor operation caused by
shortage of refrigerant
Defective thermistor
Defective outdoor controller board
LEV performance failure
Defective indoor controller board
Clogged refrigerant system caused by foreign
object
Refrigerant shortage while in heating operation
(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
ed
1102
(U2)
Compressor temperature trouble
Yes
Yes
No
Yes
Yes
No
No
No
42
OCH634C
Is 5101 displayed when restarted?
Is the outdoor stop valve (liquid/
gas) fully open?
Is there a 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 case of breakage).
(5101)
(1102)
(no leak)
Continue to the next page.
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