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As you have a Worcester boiler, it's most likely that the pump is wired directly to the boiler, rather than from the wiring centre. The idea is that the boiler keeps the pump running for some time after firing to dissipate heat, others will correct me, but I think it runs until a certain temp is...

Not ideal, would prefer soldered joint, but there are millions like that

It forms part of the non return valve inside.

As long as the fire passes a flue flow, and spillage test, no additional ventilation is required, as the heat input is less than 7kw.

If the display reads 00 then it hasn't got a call for heating from the themostat?programmer.

Part costs £48, 5 min job to change

Told ya:giggle:

My money would be on blocked condensate pipe/trap, or spark generator, you'll need a gas man in for those.

Those plastic things are pants, change it for a brass one.

Probably just one of those things, just bite the bullet and change the whole valve, they're not expensive.

You can buy "corner valves" for that, they look much neater

Does it continue if you isolate the cold feed to the boiler?

I've used quite a few ESi valves, have had no issues with them. Yet

How did you lose it?

^

He should have known that when he quoted, I wouldn't be impressed.

Looks from the pic to be the cold feed which fills the CH system, unusual to see that type of tap on it though, have a look in your loft, you'll see where it goes.

Sounds like hot water pre heat function may have been left on, check instructions for how to turn off.

Probably not, they are often different sizes. They're not difficult to replace with the right tools.

Never be afraid to push it in all the way.