Air source heat pump heating issue

[Wilko]

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 (?).

 

[Themorganator4]

I'm not familiar with s plan systems or 2 port valves. I'm a bit of a noob when it comes to this stuff

 

[Wilko]

Hi Morgan - for me the next steps would likely be to look at the control system and then the ASHP itself. Sorry to say, but I think you're going to need on site help with this fault.

 

[Themorganator4]

Just had a look at 2 port valves. Is it possible that the heating valve is faulty? I.e it opens and closes but doesn't signal to the heat pump that it is open so therefore the pump doesn't operate?

 

[Themorganator4]

Hi Morgan - for me the next steps would likely be to look at the control system and then the ASHP itself. Sorry to say, but I think you're going to need on site help with this fault.

I was hoping you wouldn't say that, I had the company out last year and they charged me about 500 quid to replace the defrost module (which didn't fix the problem) they then wanted to replace the smart starter, it seemed that they were just replacing random parts hoping it would fix the problem, charging me for the pleasure. I eventually told them enough was enough and I was not paying them any more.

 

[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.