Mitsubishi Electric PUMY-P112VKM1, Руководство по обслуживанию

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Check code
Abnormal points and detection methods Causes and check points
Abnormal if TH4 detects to be open/short.
(The open/short detection is disabled for 10 minutes after compressor
starts, during defrosting operation, or for 10 minutes after returning from
the defrosting operation.)
Open: 3 or less
Short: 217 or more TH4: Thermistor <Compressor> Disconnection or contact failure of connectors
Characteristic defect of thermistor
Defective outdoor multi controller circuit board
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
−99.9–999.9
5101
Compressor temperature thermistor (TH4) open/short
The black square (■) indicates a switch position.
<Detected in outdoor unit>
No
Yes
Yes
Yes
No
No
Is there any abnormality such
as a disconnection, looseness or
breakage?
Is the detected resistance normal?
Is the detected temperature normal?
Connect the wiring/connector properly.
Replace the connector in case of a
breakage.
Replace the thermistor.
Replace the outdoor multi controller circuit
board
(Malfunction of thermistor circuit).
No abnormality
( A connector contact failure is suspected).
Check the wiring and connector connection of TH4.
Disconnect the connector to check the
resistance of TH4 using a tester.
Check a temperature of TH4.
The detected temperature of TH4 can be displayed
by an operation of SW1 on the outdoor multi
controller circuit board.
SW1 Setting
ON
OFF
Display on LED1, 2 Unit
−99.9–999.9
:
4 1 2 5 6 7 8 3
80 81
OCH576