Panasonic WH-MHF09G3E5 Service Manual page 104

16.5.20 Compressor Rotation Failure (F14)
Malfunction Decision Conditions:
A compressor rotation failure is detected by checking the compressor running condition through the position
detection circuit.
Malfunction Caused:
1 Compressor terminal disconnect.
2 Faulty outdoor unit PCB (main).
3 Faulty compressor.
Abnormality Judgment:
Continue 4 times in 20 minutes.
Troubleshooting:
Check the U, V, and W connector connection:
- Turn OFF the power.
- Check the U, V, and W connector connection at
outdoor unit PCB (main) and compressor terminal.
Is the connector connection
Disconnect the harnesses U, V, and
W from the compressor terminal.
From the disconnected harnesses U, V, and W,
connect them to the inverter checker. Turn ON
the power and operate the system. Check the
inverter checker 6 LEDs blinking condition.
Is the blinking of the 6 LEDs in
same sequence/condition?
No
- Connector poor contact.
normal? - Correct the connection.
Yes
- IPM defective.
No
- Replace the outdoor unit PCB
Yes
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
(main).
Replace the compressor.
104
CORE
R
P
2T
U R
V B
W
Y
COMPRESSOR
CORE
FUSE T 3.15A L 250W
Outdoor unit Compressor
PCB (main) terminal
Red Blue Yellow
(YEL) YELLOW
(BLU) BLUE (RED) RED
TRADE MARK
COMP. TERMINAL
COMMUNICATION
ERROR
INVERTER SIGNAL
Inverter
checker