Check code
Abnormal points and detection methods Causes and check points
Abnormal if overcurrent of DC or the compressor is detected within 30
seconds after the compressor starts operating.
Closed outdoor stop valve
Decrease of power supply voltage
Looseness, disconnection or reverse phase of
compressor wiring connection
Malfunction of indoor/outdoor fan
Short-cycle of indoor/outdoor unit
Model selection error upon replacement of outdoor
controller board
Malfunction of input circuit on outdoor controller
board
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
4210
Compressor overcurrent interruption
Chart 1 of 2
Yes
Yes
Yes
No
No
No
Is the stop valve fully open?
Is the power supply voltage normal?
Are they set properly?
Open the stop valve fully
Check the power supply facility
(check for power supply open phase)
Set the model selection correctly
Check the outdoor stop valve
Check whether the power supply voltage is
normal or not
Check whether the model selection switch is
set correctly on the controller board or not.
Turn the power OFF to check for looseness, disconnection
or converse phases of the compressor
wiring
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