Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 67

Check code
Compressor current interruption (Locked compressor)
4100
(UF)
Abnormal points and detection methods
Abnormal if overcurrent of DC bus or compressor is detected before 30
seconds after the compressor starts operating.
●Diagnosis of defectives
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
Check the power supply voltage.
Is the power supply voltage normal?
Check if the model selection switch is set
correctly on the indoor controller board or
outdoor multi controller circuit board.
Are they set properly?
Turn the power OFF to check for
looseness, disconnection, or wrong phase
of compressor wiring connection.
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OCH632A
Diagnosis
open?
Yes
Yes
Yes
Causes and check points
Closed stop valve
Decrease of power supply voltage
Looseness, disconnection, or wrong phase of
compressor wiring connection
Model selection error on indoor controller board or
outdoor multi controller circuit board
Defective compressor
Defective outdoor power circuit board
Open the stop valve (liquid/gas) fully.
No
• Check the looseness, disconnection, or
breakage of compressor wiring.
No
• Ensure power supply from the facility.
(Check for power supply open phase.)
Set the model selection switch correctly,
No
then restart.
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Chart 1 of 2
Remedy