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Check code
4210
Abnormal points and detection methods
Abnormal if overcurrent of compressor is detected after 30 seconds since
the compressor starts operating.
●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?
Check whether the model selection switch is set correctly
on the outdoor multi controller circuit board or not.
Are they set properly?
Turn the power OFF to check for looseness, disconnection
or converse phases of the compressor wiring.
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OCH576
Compressor overcurrent interruption
Diagnosis
open?
Yes
Yes
Yes
Causes and check points
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
multi controller circuit board
Malfunction of input circuit on outdoor multi controller
circuit board
Defective compressor
Defective outdoor power circuit board
Open the stop valve (liquid/gas) fully.
No
Check the power supply facility
No
(check for power supply open phase).
Set the model selection correctly.
No
73
Chart 1 of 2
Remedy
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