Check code
4220
Voltage shortage/Overvoltage/PAM error/T open-phase/
Power synchronization signal error
●Diagnosis of defectives
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
Yes
No
No
Yes
Yes
No
Yes
Yes
No
No
Yes
Is CN5 connected properly
without any contact failure?
The bus voltage can be displayed by an
operation of SW1 on the outdoor controller
board.
Correct the CN5 wiring.
Continued from the previous page
Is there any breakage of CT1 on
the noise fi lter board?
Is the power supply normal?
Is the bus voltage normal?
The difference on the voltage between
the one read by the microprocessor and
the one at the both ends of R80 is large.
Malfunction of noise fi lter CT1.
Replace the outdoor power board
(Defective outdoor power board).
Decrease of power supply voltage.
T open-phase.
Replace the outdoor power board
(Defective outdoor power board).
Replace the outdoor power board
(A HIC trouble is suspected).
Check the power supply facility
(Check if a receiving electricity is lowered).
Check the bus voltage read by the microprocessor
with an operation of SW1 on the outdoor controller
board.
Check the bus voltage at the both ends of
R80 on the outdoor power board using a
tester.
ON
OFF
12345678
SW1 Setting
Display on LED1,2
Unit
0 999.9 V
54
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