Compressor Overcurrent Interruption; 4210 - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

Check code

4210

12 VDC power supply circuit on power circuit board
(UP)
Abnormal points and detection methods
If overcurrent of compressor is detected after 30 seconds since the
compressor starts operating.
If 12 VDC power is not supplied from the 12 VDC supply circuit on the
power circuit board.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Which sub code is displayed?
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.
OCH760
Compressor overcurrent interruption/failure in
Diagnosis
8
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
Replace the outdoor power circuit board
7
(Defective outdoor power circuit board).
The sub codes are displayed by an
operation of SW1 on the outdoor
mutli controller circuit board.
SW1 Setting
Display on LED1,2
7: 12 V power supply circuit trouble
1 2 3 4 5 6 7 8
ON
8: Overcurrent trouble
OFF
1 2 3 4 5 6 7 8
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
58
Chart 1 of 2
Remedy