Air source heat pump heating issue

[Themorganator4]

Hi - if I understand correctly the HW works and you can use it to get heating running. Are you familiar with S plan systems with two 2 port valves, is that how the ASHP is plumbed (?).

That is correct, I believe it is an s plan system with 2 port valves

 

[solarsavings]

It does sound like a controls problem. Can you post some photos of your system controls.

 

[Themorganator4]

After educating myself with an s plan system etc, would it be a good idea to check the heating valve is sending the signal to the heat pump to say it is open and therefore turning on heating? As the valve opens (hence the heating working under hot water) but may not be telling the heat pump this.

 

[Themorganator4]

It does sound like a controls problem. Can you post some photos of your system controls.

I will do as soon as I am home (at work currently)

 

[Wilko]

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.

 

[Themorganator4]

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

 

[Themorganator4]

And I assume if the orange wire reads 0 then it's a new valve?

 

[Wilko]

Hi - no no no, maybe .
Power may not be coming into valve on the the grey wire. Or the connection from the orange to the boiler may be no more etc ...

 

[Themorganator4]

Hi - no no no, maybe .
Power may not be coming into valve on the the grey wire. Or the connection from the orange to the boiler may be no more etc ...

So the orange is the wire which tells the ASHP the valve is open and to make heat and that's what you suspect is the issue?

Are you also saying if that wire is not live then it doesn't necessarily mean the valve is faulty?

 

[Themorganator4]

Luckily I have a friend who is a plumber and he may have a spare valve motor we can try just to see if that is the problem

 

[Themorganator4]

Also one of the valves has the switch stuck on manual (it has been jammed for some reason) would that cause this issue. I forgot to mentiin this earlier! Sorry.

 

[solarsavings]

Could be your programmer not sending a signal to the valves

 

[Themorganator4]

Could be your programmer not sending a signal to the valves

I don't think that's the problem as when the heating is off but hot water on then there is no heat, so the valve seems to be working ok

 

[Wilko]

Check which valve is stuck

 

[Themorganator4]

Check which valve is stuck

As in hot water or heating? If it's the heating valve then id imagine that's the problem and it will just be a case of moving it to auto (if I can free it) or getting a new valve motor