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Diagnostic procedure for check code
Check code
[b5]
External input display fault
[b6]
External interlock display fault
Fault on CN17 - fault on external device
(accessory)
Is the external device connected
to connector CN17 ?
Yes
Is the external device
operating normally ?
Yes
Check cause of the operation.
Check code
[d3]
TH sensor alarm
Refer to outdoor unit
There is an error with the temp. sensor incorporated in IGBT. Check connectors CN07 on IPDU PC board
and CN600 on interface PC board. If there is no problem, replace IPDU PC board.
Troubleshooting
Operation cause
1. External device error.
2. Indoor PC board error.
No
No
Operation cause
Error of temp. sensor incorporated in IGBT
(Inverter Gate Bi-Polar Transistor)
Check indoor PC board.
If defective, replace.
Check external device.
If defective, replace.
61
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