Water pump working permanently

[peter lanky]

We have had our central heating system 16 years and never really changed the way or the frequency that we use it. The heating is generally switched off from the beginning of April to the end of October, using only the water heating during this time.

The last few days, the pump has been running all the time, even during the night, and the airing cupboard feels hotter than normal. The pipes in the airing cupboard are much hotter than usual. However, I have looked at the boiler and outside the scheduled times of 6:30-8:00am and 15:30-17:30pm it is not firing up. I have also checked the gas usage, and we do not appear to be using any more than normal. The heat setting switch inside the boiler which is scaled as 'Low,1,2,3,4,5,High' is set to 2 which it always has been in summer. When somebody has had a bath, the pump eventually stops

The pump is called a Grundfos Selectric. Can anyone offer an explanation please?

 

[aggis]

You need to check where the power to the pump is coming from.
Depending on your boiler it might have a pump over run. you need to look at the boiler wiring diagram. if so it's easy to check,
It'll then need changing if faulty.
Has your system got a motorised valve, if the micro switch inside is stuck it could be suppling a permanent live to the pump

 

[peter lanky]

I don't know the answer to any of those questions, and I wouldn't know anything about wiring diagrams.

 

[tamz]

I don't know the answer to any of those questions, and I wouldn't know anything about wiring diagrams.

You would be better getting someone in to have a look 😉

 

[Aster]

Did you get this fault resloved as we have the same problem and i think its the control panel?

 

[so-solar]

have been to exactly the same fault and it was the motorised valve stuck open sending a live feed to the pump, meaning the pump just ran and ran and ran............... hope this helps

 

[dontknowitall]

Not come across this before but looks as if it could be a useful thing to know for the future. Thank you.

 

[Aster]

where is the motorised valve , in the boiler or elsewhere?

 

[tamz]

Probably next to the pump

 

[peter lanky]

I got an engineer in. The problem was the variable heat control switch inside the boiler, which needed replacing.