Panasonic 2WAY Multi Technical & Service Manual page 52

Troubleshooting
1
Power supply
1-1 Is/was the outdoor unit power OFF?
2
Is the terminating resistance switch (SW010) on the
2-1
Setting
outdoor unit's main board set at [SHORT]?
switches
2-2 Is the number of indoor units set at two?
Do the system addresses for the water heat exchanger
2-3
unit and outdoor unit match up?
3
Is the indoor/outdoor operation wiring severed (connectors,
3-1
Indoor/outdoor
terminals disconnected)?
operation wiring
3-2 Is the indoor/outdoor operation wiring short-circuited?
3-3 Is the indoor/outdoor operation wiring grounded?
Is the connection for the water heat exchanger unit
3-4 electrical box's indoor/outdoor operation wiring located
between the terminal boards TB5-1 and 2?
Is electrical voltage being applied to the indoor/outdoor
3-5 operation wiring? (If no, the fuse (F1) on the outdoor unit's
main board has blown.)
Repair the wiring properly so that no electrical voltage is
3-6 applied. Is the outdoor unit's main board CN046 already in
use?
4
Outdoor unit 4-1 Has the outdoor unit broken down?
breakdown
5
Noise
5-1 Is a source of noise located nearby the outdoor unit?
● See "5. Reference Document" for details on the procedure for replacing the water heat exchanger unit's
control board.
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6
IV–39
Turn the power on and
Yes
wait 3 minutes
No 2-1
Yes 2-2
No Correct to [SHORT]
Yes 2-3
No Set [2 units]
Yes 3-1
Make sure the water
heat exchanger SW14
No
and the outdoor unit
setting match up
Yes Repair severed wires
No 3-2
Yes Correct the short circuit
No 3-3
Yes Correct the ground
No 3-4
Yes 3-5
No Repair
Yes 3-6
No 4-1
Replace the outdoor
Yes
unit's main board
Reverse the connectors
on the outdoor unit's
No
main board (CN045 →
CN046)
Yes Repair the malfunction
No 5-1
Set up noise
Yes
countermeasures
Replace the outdoor
No
unit's main board