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P09 Indoor Unit Ceiling Panel Connector Connection Failure
(Cannot be detected when the water heat exchanger unit is connected.)
Error detection method
• Detects when indoor control board connector PNL (3P green) CN080 1 and 3 are open, and determines an
error.
• The wiring method and connectors differ among indoor units. For details, see the electric wiring diagrams
for each indoor unit.
• This input short-circuits on the following models when a ceiling panel or front panel connector is connected,
thus detecting a panel connection.
Basic circuit
(green)
Indoor board
Applicable models
S-22/28/36/45/56/73ML
S-28/36/45/56/73MD
S-22/28/36/45/56/73/106/140/160MU
S-22/28/36/45/56MY
• The following models short-circuit this input upon shipping, to prevent this error.
Basic circuit
(green)
Indoor board
Applicable models
FR7/9/12/16/18/25
TDR12/16/18/25/36/48
Basic circuit
(green)
Indoor board
Applicable models All indoor units not listed above
Troubleshooting
1
Is a ceiling panel connection relay connector 7P (red) or 8P
1-1
(red) or 9P (red) connected? Or, is a short-circuiting connector
4P (white) connected?
Disconnect the indoor board connector PNL (green) CN080.
1-2
Conduction between No.1 and No.3 in socket?
Poor connection between connector PNL (green) CN080 and ceiling panel, or poor
1-3
connection/broken wire between connector PNL (green) CN080 and short-circuit connector
→ Repair
● See instructions packaged with servicing indoor board for procedure on replacing indoor control board.
Relay connector 8P or 9P
Short circuit
Short circuit
Relay connector 7P
8P (ceiling panel)
7P (ceiling panel)
7P (ceiling panel)
Relay connector 4P
Short circuit
(front panel)
(ceiling panel)
Short circuit
IV–86
Yes 1-2
No
Connect
Replace indoor control
Yes
board
No
1-3
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Troubleshooting
