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Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[b5] 1. External device error.
External input display fault 2. Indoor PC board error.
[b6]
External interlock display fault
Fault on CN17 - fault on external device
(accessory)
Is the external device
operating normally ?
No
Is the external device connected
to connector CN17 ?
Check indoor PC board.
If defective, replace.
j
h
No
Ye s
j
Ye s
Check external device.
If defective, replace.
h
Check cause of the operation.
Check code Operation cause
[d3] Error of temp. sensor incorporated in IGBT
TH sensor alarm (Inverter Gate Bi-Polar Transistor)
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.
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