1102 - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

Check code

1102

(U2)
Abnormal points and detection methods
(1) If TH4 falls into following temperature conditions;
●exceeds 110 continuously for 5 minutes
●exceeds 125
(2) If a pressure detected by the high pressure sensor and converted
to saturation temperature exceeds 40
exceeds 110 .
TH4: Thermistor <Compressor>
LEV: Linear expansion valve
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Is 5101 displayed when restarted?
Is the outdoor stop valve (liquid/gas)
fully open?
Is there refrigerant leak?
Check the connection for thermistor wiring
and indoor controller board connector.
Is there any abnormality on
connectors/wires such as disconnection,
half-disconnection or breakage?
Continue to the next page.
OCH760
Compressor temperature trouble
during defrosting, and TH4
Diagnosis
(5101)
(1102)
No
Yes
(no leak)
No
No
Causes and checkpoints
Malfunction of stop valve
Over-heated compressor operation caused by
shortage of refrigerant
Defective thermistor
Defective outdoor multi controller circuit board
LEV performance failure
Defective indoor controller board
Clogged refrigerant system caused by foreign object
Refrigerant shortage
(Refrigerant liquid accumulation in compressor while
indoor unit is OFF/thermo-OFF.)
Yes Refer to the diagnosis of check code 5101.
Open the stop valve (liquid/gas) fully.
No
Repair the refrigerant leakage.
Yes
Connect the connector properly
(Repair or replace it in the case of
Yes
breakage).
43
Chart 1 of 2
Remedy