Central heating pump on continuous

[Deleted account]

Thanks for reply.
I think it needs a spdt timer relay fitting to control the pump unless the new boiler can be retrofitted.

The pump terminations have been identified in post 11,12 & 14. No retro should be needed. Your gas installer should know this. Consult him.

 

[brianmoooore]

Thanks for reply.
I think it needs a spdt timer relay fitting to control the pump unless the new boiler can be retrofitted.

It does need a timer relay to control the pump, and one, in some form or other, is already built into the boiler, but it won't do much unless the pump is actually connected to it!

 

[andyb]

123 did well to spot that, I couldn't see it, even after he said it was there. I do now.
What I would say is be carefull. The blue has some black tape on it so I doubt that it's a neutral.
My guess, and it's just a guess, it will need to be proved. Is that the extra cable is the switched feed for the heating and the pump live feed from the connections that 123 identified.

 

[Deleted account]

Going back to your original post. valiant are coming out at your cost.
seriously that engineer needs to pay for this not you. He should know better than us sparkies.

try the plumbing forum. They will slate the engineer for not knowing.

someone on here should give you a link to them.

 

[andyb]

Going back to your original post. valiant are coming out at your cost.
seriously that engineer needs to pay for this not you. He should know better than us sparkies.

try the plumbing forum. They will slate the engineer for not knowing.

someone on here should give you a link to them.

I agree, I'd get in touch and cancel, it can't be much.
You said that you think the extra brown is to the pump, then take it out of the live terminal and put it into the pump live, that will probally sort it.

 

[brianmoooore]

I think you ought to go through the whole of the wiring if it has been done by the heating "engineer".
There are apparently three two port valves in this system.
Each valve normally has a grey wire and an orange wire connected to a built in microswitch.
All three greys are connected together and are connected to permanent live.
All three orange wires are also connected together and go to the boiler switched live terminal.
A permanent live, from the same source as the grey wires are connected to, goes to the permanent live terminal of the boiler.
A neutral also goes to the boiler as well, of course.
The pump should connected, live and neutral, to the appropriate terminals in the boiler.
So, there should be a four core flex going to the boiler from the wiring box that the valves are connected to, and a three core flex coming from the boiler to the pump.

 

[andyb]

I think you ought to go through the whole of the wiring if it has been done by the heating "engineer".
There are apparently three two port valves in this system.
Each valve normally has a grey wire and an orange wire connected to a built in microswitch.
All three greys are connected together and are connected to permanent live.
All three orange wires are also connected together and go to the boiler switched live terminal.
A permanent live, from the same source as the grey wires are connected to, goes to the permanent live terminal of the boiler.
A neutral also goes to the boiler as well, of course.
The pump should connected, live and neutral, to the appropriate terminals in the boiler.
So, there should be a four core flex going to the boiler from the wiring box that the valves are connected to, and a three core flex coming from the boiler to the pump.

This is all correct Brian. However as it was just a boiler swap I'm guessing no other cables were touched, just the ones in the boiler. If this is true then the four conductors will be live, neutral, heat demand and pump live out.
That shouldn't be too hard to work out, and as he says the pump is on permantly that points to the extra brown being the pump and the blue with black tape being the switch feed to the boiler.

 

[123]

Going back to your original post. valiant are coming out at your cost.
seriously that engineer needs to pay for this not you. He should know better than us sparkies.

try the plumbing forum. They will slate the engineer for not knowing.

someone on here should give you a link to them.

Vaillant won't fix the issue either, it's nothing to do with the boiler.

Gas installers understanding heating wiring and controls? I wouldn't let most of them loose to connect a plug top.
I'd be concerned what else the boiler installer has done as the wago's in 1st pic look like they have just been installed as well.

 

[Strima]

That shouldn't be too hard to work out, and as he says the pump is on permantly that points to the extra brown being the pump and the blue with black tape being the switch feed to the boiler.

The one's in the roomstat termination?

TBH I'd rip the lot out and start again.

 

[andyb]

The one's in the roomstat termination?

TBH I'd rip the lot out and start again.

If I understand you, no, the one in the roomstst terminal is probally correct, the one in the live is probally for the boiler terminal.

 

[Strima]

If I understand you, no, the one in the roomstst terminal is probally correct, the one in the live is probally for the boiler terminal.

Looking at the flex I would have said both go to the roomstat but as the pump's running on who knows what's going on with the wiring...

 

[andyb]

Looking at the flex I would have said both go to the roomstat but as the pump's running on who knows what's going on with the wiring...

I doubt both go to the roomstat Strima, what would open the valve. Looks like the cable goes to the heating joint box where one is the return from the roomstat and the other goes to the pump. In fact if this was a straught swap with no messing with the wiring, that has to be the case.

 

[Strima]

I doubt both go to the roomstat Strima, what would open the valve. Looks like the cable goes to the heating joint box where one is the return from the roomstat and the other goes to the pump. In fact if this was a straught swap with no messing with the wiring, that has to be the case.

Quite possibly, but without looking we'll never know... ?

 

[Edward67]

X14 - it's hiding under the mains cables, obscured by the brown & blue wires.

Thanks all sorted now. Good spot and saved the installer the vaillant call out fee.

 

[Edward67]

By moving the the doubled up live to x14 the pump started operating normally. The RT does go to the room stat. As chased it through.
So thanks andyb you are correct.
The installer just missed the x14 because he usually installs worcester but couldn't get one in time.
Thanks for all replies and help.