Check code
Abnormal points and detection methods Causes and check points
Abnormal if overcurrent of DC bus or compressor is detected 30seconds
after the compressor starts operating. To determine the source of
abnormality, either the compressor or the power module, drive the power
module forcedly.
Closed outdoor stop valve
Decrease of power supply voltage
Disconnection, looseness or conversed connection
of compressor wiring
Defective compressor
Defective outdoor power board
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
4250
Power module trouble
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Is the stop valve fully open?
Is the power supply voltage normal?
Are the wirings normal?
Does it operate normally?
Open the stop valve fully.
Ensure power supply from facility.
Connect the compressor wiring (U, V and
W phase) properly, then turn the power
back ON.
Replace the outdoor power board or
outdoor controller board.
Defective power board.
Replace the compressor
(Defective compressor).
Check the outdoor stop valve.
Check whether the power supply voltage is
normal or not.
Turn the power OFF to check for
looseness, disconnection or phases of the
compressor wiring.
Disconnect the wiring to check the power
module.
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