Mitsubishi Electric PUMY-P200YKM2 Technical & Service Manual page 57

Check code
4210
(UP)
Abnormal points and detection methods
If overcurrent of DC bus or compressor is detected after 30 seconds since
the compressor starts operating.
●Diagnosis of defects
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
open?
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
Continue to the next page.
OCH675D
Compressor overcurrent interruption
Diagnosis
Yes
Yes
Yes
Causes and checkpoints
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
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Chart 1 of 2
Remedy