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Check code
4250
Abnormal points and detection methods
Abnormal if overcurrent of DC bus or compressor is detected 30 seconds
after the compressor starts operating. To determine the source of
abnormality, either the compressor or the power module, drive the power
module forcedly.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Check the outdoor stop valve.
Is the stop valve (liquid/gas) fully
Check whether the power supply voltage is
normal or not.
Is the power supply voltage normal?
Turn the power OFF to check for
looseness, disconnection or phases of the
compressor wiring.
Are the wirings normal?
Disconnect the wiring to check the power
module.
Does it operate normally?
OCH576
Power module trouble
Diagnosis
open?
Yes
Yes
Yes
Yes
Yes
Causes and check points
Closed outdoor stop valve
Decrease of power supply voltage
Disconnection, looseness or conversed connection
of compressor wiring
Defective compressor
Defective outdoor power circuit board
Open the stop valve (liquid/gas) fully.
No
No
Ensure power supply from facility.
Connect the compressor wiring (U, V and
No
W phase) properly, then turn the power
back ON.
Replace the outdoor power circuit board
No
or outdoor multi controller circuit board
(Defective power circuit board).
Replace the compressor
(Defective compressor).
78
Remedy
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