Air source heat pump heating issue

Themorganator4 · Feb 21, 2019

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 · Feb 21, 2019

Could be your programmer not sending a signal to the valves

Themorganator4 · Feb 21, 2019

solarsavings said:
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 · Feb 21, 2019

Check which valve is stuck

Themorganator4 · Feb 21, 2019

Wilko said:
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

Wilko · Feb 21, 2019

As the Zen master says - we will see

Themorganator4 · Feb 21, 2019

Before I check the orange wire with a multi meter, I'm looking for 250v on this wire when the heating is on and 0v when heating off right?

davesparks · Feb 21, 2019

Themorganator4 said:
Before I check the orange wire with a multi meter, I'm looking for 250v on this wire when the heating is on and 0v when heating off right?

With a multimeter you may get a reading of 240V regardless of whether it is actually live or not.

Themorganator4 · Feb 21, 2019

davesparks said:
With a multimeter you may get a reading of 240V regardless of whether it is actually live or not.

Ok so how would I test it to see if it is faulty? Measure resistance?

solarsavings · Feb 21, 2019

It might have volt free switching. What will you do then?

Themorganator4 · Feb 21, 2019

solarsavings said:
It might have volt free switching. What will you do then?

I would test the connection between the grey and orange wire maybe? What do you recommend

solarsavings · Feb 21, 2019

I could, but it would be very expensive as I would charge traveling time + time on site

Photos.

Themorganator4 · Feb 21, 2019

solarsavings said:
I could, but it would be very expensive as I would charge traveling time + time on site

Photos.

I will take some tonight about 7pm when I am home

davesparks · Feb 21, 2019

Themorganator4 said:
Ok so how would I test it to see if it is faulty? Measure resistance?

A voltage tester which doesn't give false readings due to phantom voltages would be my choice of tester for this. You could try the multimeter, but there's no guarantee that the results you get will. Be correct unfortunately.

GBDamo · Feb 21, 2019

Right, before you start pulling things to bits you need to check whether there is power at terminal 9 of the heat pump wiring centre, see page 9 of the manual.

If you have 230 at terminal 9 then the HP is asking the MV to open, if there is no power then the HP is not asking for heating regardless of what the controller says.

I still think this is a parameter error or sensor fault.

If you have power at terminal 9 and no power at the MV then a broken wire you have, or a hidden JB.

The ones I've seen tend to power the MVs from the HP, the orange/grey being used to power pumps via contactors.

Is there and internal wiring centre? If so a loose connection in there may be the cause.

Themorganator4 · Feb 21, 2019

Pics as promise, turns out I have a 3 port valve on the buffer tank. The 2 port valve with the warning sticker is the one stuck on manual.

This was taken when both heating and hot water are on, the water pump is working as is the heating (as the hot water is on)

[ElectriciansForums.net] Air source heat pump heating issue

Themorganator4 · Feb 21, 2019

GBDamo said:
Right, before you start pulling things to bits you need to check whether there is power at terminal 9 of the heat pump wiring centre, see page 9 of the manual.

If you have 230 at terminal 9 then the HP is asking the MV to open, if there is no power then the HP is not asking for heating regardless of what the controller says.

I still think this is a parameter error or sensor fault.

If you have power at terminal 9 and no power at the MV then a broken wire you have, or a hidden JB.

The ones I've seen tend to power the MVs from the HP, the orange/grey being used to power pumps via contactors.

Is there and internal wiring centre? If so a loose connection in there may be the cause.

Excuse my ignorance but what does JB stand for

GBDamo · Feb 21, 2019

Themorganator4 said:
Excuse my ignorance but what does JB stand for

Junction box,

The one on the wall next to the switches.

You'll probably find a multi core flex going from there to the HP.

One core will go to terminal 9 on the HP and the heating MV should be connected here also.

I'm not sure what the three port is doing, especially in the position it is. Might be a return diverted.

Any joy with the engineers manual?

solarsavings · Feb 21, 2019

It's difficult to see whats going on in that photo otherthan there is a call for heat as the pump is/should be running. I've never seen a buffer used like that before. What room stat do you have?

Themorganator4 · Feb 21, 2019

solarsavings said:
It's difficult to see whats going on in that photo otherthan there is a call for heat as the pump is/should be running. I've never seen a buffer used like that before. What room stat do you have?

It's a Honeywell but it doesn't appear to be working (heating is on no matter temp on stat) EDIT, scrap that, it works fine:

Themorganator4 · Feb 21, 2019

GBDamo said:
Junction box,

The one on the wall next to the switches.

You'll probably find a multi core flex going from there to the HP.

One core will go to terminal 9 on the HP and the heating MV should be connected here also.

I'm not sure what the three port is doing, especially in the position it is. Might be a return diverted.

Any joy with the engineers manual?

I won't be able to get round to that until the weekend, as soon as I do I will post the results

Wilko · Feb 22, 2019

Hi - this is a 2 pole voltage tester and I wouldn't attempt this without it, or its brother. I'm just repeating I know, but inside the valve covers are L conductors and if the place has been installed incorrectly they may not isolate with the local switch. That's why we test everything to everything.
Megger TPT320 AC/DC Voltage Tester - https://www.test-meter.co.uk/megger-tpt320-ac-dc-voltage-tester/

Themorganator4 · Feb 22, 2019

So you're saying they could still be live even if isolated due to poor wiring?
Also what is the purpose of a 2 pole tester?

Themorganator4 · Feb 27, 2019

So it appears that terminal 9 is reading 240 regardless if heat is on or off, what does this mean?

Themorganator4 · Feb 27, 2019

And I assume I put 1 probe on the live wire and the other on terminal 9? Sorry I am a bit of a noob unless the electrics are very basic

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