OP
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Hi - I think you've got a control system problem and an ASHP problem.
My best guess is the orange wire from the zone valve is not being made L so the ASHP doesn't know to make heat. If you go near those zone valves be aware there are 240V connections - Danger Morgan, Danger. Several faults can have the same effect (cabling, microswitch, motor for example). An experienced Electrician should confirm if the fault is there fairly quickly, just saying. After the control system is working properly that will still leave the defrost problem, sorry.
Don't worry, I may not have much experience in electrics but I know how to isolate a system and not touch live wires haha.
Frankly I don't care about the defrost issue currently as it never ices up much. As long as I get heat on demand then I'm happy