Air source heat pump heating issue

[Wilko]

As the Zen master says - we will see

 

[Themorganator4]

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]

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]

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]

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

 

[Themorganator4]

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]

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

Photos.

 

[Themorganator4]

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]

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]

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]

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)

 

[Themorganator4]

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]

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]

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]

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: