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fujitsu asy9lsacw/aoy12lsac problems

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Hi all,

I am new to the forum and am after some advice.

My uncle has the above split room air conditioner, and after calling out 3 local "fujitsu experts" none of which could resolve the problem, we have decided to have a go ourselves. We will either break it even more or repair it. He is a retired electrician and I am a plumber (although have no experience with air con).

The problem is the outdoor unit is showing no signs of life and the indoor unit lights flash.
operation light 0.1 sec blinking and timer light 0.5 sec 2 times which according to the manual is "Normal Serial Reverse Signal can not be received more than 10 secs."
What does that mean? PCB failure?

The unit has had a pcb failure in the past and was replaced under warranty, but that was a few years ago. Could there be a faulty component causing the pcb to fail?
Any input is appreciated

Thanks

Carl

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