Normal
Is the voltage of main incoming power
• 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 280–350 V DC?
• Check wiring.
• Check power circuit board.
• Check noise filter circuit board.
Yes
Yes
Yes
No
No
No
Power circuit board check
Outdoor controller circuit board
Noise filter circuit board
LI
NI
208/230 V ±10% AC
3
-
1
CNDC
(PNK)
LO
NO
Power circuit board
280–350 V DC
COMP
W
7 6 5 4 3 2 1
CN2
(WHT)
U-V 10–250 V AC
U-W 10–250 V AC
V-W 10–250 V AC
conv.
circuit
Note: See test point.
52C
W
W
W
V
U
Circuit diagram
L1
L2
TB1
198–253 V AC
198–253 V AC
198–253 V AC
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