Normal
Is the voltage of main incoming power
198–253 V AC
198–253 V AC
198–253 V AC
• Check the breaker and power supply.
Is the voltage to the compressor
(U-V,U-W and V-W) balanced?
Note: To check the voltage of the parts on this board with a tester is difficult due to its location.
Test points are limited.
• Check wiring.
• Check model setting switch SW6
on the outdoor controller circuit board.
• Replace the power circuit board.
Is the voltage of CNDC(PNK) on outdoor
controller circuit board 280–350V DC?
• Check wiring.
• Check power circuit board.
• Check noise filter circuit board.
Yes
Yes
Yes
No
No
No
Power circuit board check
7
6
5
4
3
2
1
Noise
Filter
Circuit
Board
Power circuit board
Conv.
Circuit
CNDC
(PNK)
7 6 5 4 3 2 1
Comp
U
V
W
U-V 10–250 V AC
V-W 10–250 V AC
W-U 10–250 V AC
LI NI
L N
TB1
290–350 V DC
Circuit diagram
3
1
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