I can find an A05, which is a pressure switch fault.
You could try dropping the drain hose all the way to floor level to drain all the water out of it to see if that clears it, if not it may be a service call to clear the pressure system.
I think that will be a service call ..
I cannot find A5 code on the web .. apart from unanswered questions about it.
Must be electronic I would have thought. Maybe a motor pump failure .. does it stop about the same time as you would expect the motor/pump to tart up?
I can find an A05, which is a pressure switch fault.
You could try dropping the drain hose all the way to floor level to drain all the water out of it to see if that clears it, if not it may be a service call to clear the pressure system.
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