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Hi

I have just had my boiler replaced which was a potterton suprima 60l. Heat only boiler as it kept cutting out.
I have had a vailent ecofit 425 fitted by engineer but now my pump is running continuously.
This wasn't the case before.
It's s plan with two heating 2 port valves and 1 hot water two port valve.
I have two stats and they are both 3 core.
The boiler as far as I can tell has live neutral and earth the a second cable linked with live which. I think goes to the pump and another in rt.
I have checked boiler setting and they Re set too intermittent with 5 min over run.
The fitter says he doesn't know and has asked vailant to attend at my cost.
Help appreciated. I am an electrician but my heating side is limited.
Ideas most welcome.

Thanks
 
Is the boiler firing without being called to?
It sounds like he has left the link in on the 24v RT which is a common mistake.
 
Is the boiler firing without being called to?
It sounds like he has left the link in on the 24v RT which is a common mistake.
Hi thanks for reply.

The link has been removed and the heating is working on programmer as you would expect.
The pump is even on if I disconnect the programmer because the L and RT cable in the boiler are fed to connectors behind programmer no to the programmer itself.
 

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Hi thanks for reply.

The link has been removed and the heating is working on programmer as you would expect.
The pump is even on if I disconnect the programmer because the L and RT cable in the boiler are fed to connectors behind programmer no to the programmer itself.

Is the boiler firing without being called to?
It sounds like he has left the link in on the 24v RT which is a common mistake.
 

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If, as you say, the second cable in the live terminal goes to the pump, then of course the pump will run continuously.
 
If, as you say, the second cable in the live terminal goes to the pump, then of course the pump will run continuously.
So how do I rectify as heating engineer doesn't know. The only boiler connections are live neutral earth and RT.
What is different between this boiler and old boiler. I never saw the connections on the old potterton. Would it of has a pump feed on it?
 
You'll have to work through the wiring Edward, trace it and make a drawing. Does the extra cable go to the pump or not? it should be easy to prove one way or another. Does it go to the room stat? if not where is the room stat cable? where's the junction box? You need to find all these things before you can find the problem.
If you do a simple schematic drawing of where all the conductors go, you'll be able to sort this.
 
So how do I rectify as heating engineer doesn't know. The only boiler connections are live neutral earth and RT.
What is different between this boiler and old boiler. I never saw the connections on the old potterton. Would it of has a pump feed on it?
really! The heating engineer doesn’t know.
he shouldn’t be a heating engineer then.

The Pump needs to be wired into the switched live and come on when heat is called for. Possibly there is somewhere in the boiler for a separate connection to allow over run, but impossible to diagnose from afar.
 
really! The heating engineer doesn’t know.
he shouldn’t be a heating engineer then.

The Pump needs to be wired into the switched live and come on when heat is called for. Possibly there is somewhere in the boiler for a separate connection to allow over run, but impossible to diagnose from afar.
Thanks for reply.
I think it needs a spdt timer relay fitting to control the pump unless the new boiler can be retrofitted.
 
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.
 
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.
 
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.
 

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