Carrier Dustbin unit.

Hello All.

I have a client with a very old Carrier Dustbin unit connected to a ceiling cassette.

Unit is three phase and has one PCB in the indoor unit which controls everything including compressor, reversing valve etc.

Unit appears to have a crude form of fault codes, but as it is so old I can not find any information.

At present you can not turn unit off at wired controller and defrost and power lights are flashing continously.
There is no outputs active to outdoor unit.

Indoor model is 40KQ050700-2
Outdoor model is 38QT050900-21

Thanks in advance.