Mitsubishi Electric PUMY-P200YKM2 Technical & Service Manual page 55

Check code
Compressor current interruption (Locked compressor)
4100
(UF)
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 stop valve.
Is the stop valve (liquid/gas) fully
open?
Check the power supply voltage.
Is the power supply voltage normal?
Turn the power OFF to check for
looseness, disconnection or phases of the
compressor wiring.
Is it connected properly?
Check whether the model selection switch is
set correctly on the outdoor multi controller
circuit board or not.
Continue to the next page.
OCH675D
Diagnosis
Yes
Yes
Yes
Causes and checkpoints
Closed stop valve
Decrease of power supply voltage
Looseness, disconnection or converse of compressor
wiring connection
Model selection error upon replacement of indoor
controller board
Defective compressor
Defective outdoor power circuit board
Open the stop valve (liquid/gas) fully.
No
Ensure power supply from the facility.
No
Connect the wiring properly,
No
then turn the power back ON.
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Chart 1 of 2
Remedy