Mitsubishi Electric PUMY-P112VKM5-ERBS, Техническое и сервисное руководство

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Check code
4220
(U9)
Voltage shortage/overvoltage/PAM error/L1 open phase/primary
current sensor error/power synchronization signal error
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
The black square (■) indicates a switch position.
Chart 2 of 2
Replace the outdoor power circuit board
(Defective outdoor power circuit board).
Yes
No
No
Yes
7,8 6
Y model
V model
Yes
Yes
No
No
Is CN5 connected properly
without any contact failure?
Correct the CN5 wiring.
Continued from the previous page.
Is there any breakage of ACCT
on the noise filter circuit board?
Replace the noise filter circuit board.
Replace the outdoor power circuit board
(Defective outdoor power circuit board).
ON
OFF
1 2 3 4 5 6 7 8
SW1 Setting
Display on LED1,2 Unit
0–9999 V
Is the outdoor unit
V model or Y model?
The bus voltage can be displayed by an
operation of SW1 on the outdoor multi controller
circuit board.
Is the power supply normal?
Is the bus voltage normal?
Check the power supply facility.
Check the resistor connected to 52C relay
and reactor.
Replace it if the resistor is broken.
Replace the outdoor power circuit board if
the resistor is not broken.
Operate the unit and check if the problem
occurs again.
Check the bus voltage read by the microprocessor
with an operation of SW1 on the outdoor multi
controller circuit board.
Check the bus voltage at the test points
listed below on the outdoor power circuit
board using a multimeter.
Test pointsl: CNDC 1-3pin
Check the power supply voltage on the terminal block
of the outdoor unit.
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OCH740