Mitsubishi Electric PUMY-P112VKM1 Service Manual page 76

Split-type, heat pump air conditioners
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Check code
4220
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Continued from the previous page
Is CN5 connected properly
without any contact failure?
Is there any breakage of ACCT
on the noise filter circuit board?
Check the bus voltage read by the microprocessor
with an operation of SW1 on the outdoor multi
controller circuit board.
Is the power supply normal?
Check the bus voltage at the test points
listed below on the outdoor power circuit
board using a tester.
V model: CNDC 1-2pin
Y model: N2-P2
Is the bus voltage normal?
The difference of the voltage between the
one read by the LED1 and 2, and the one at
the testpoints listed above is large.
OCH576
Undervoltage/Overvoltage/PAM error/L1 open-phase/
Power synchronization signal error
Diagnosis
Yes
No
Yes
Yes
Yes
No
The black square (■) indicates a switch position.
No
Malfunction of noise filter ACCT.
Yes
Replace the outdoor power circuit board
(Defective outdoor power circuit board).
The bus voltage can be displayed by an
operation of SW1 on the outdoor multi
controller circuit board.
SW1 Setting
Display on LED1,2
ON
0–999.9
OFF
1 2 3 4 5 6 7 8
• Decrease of power supply voltage
No
• L1 open-phase
Replace the outdoor power circuit board
No
(Defective outdoor power circuit board).
Replace the outdoor power circuit board
Yes
(Trouble of an input current detection
circuit is suspected).
Check the power supply facility
(Check if a receiving electricity is lowered).
76
Chart 2 of 2
Remedy
Correct the CN5 wiring.
Unit
V

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