Excessive Pump Overrun

[Deleted member 107929]

Hi,

I've been searching for a while for an answer to this. Had heating engineer out today to look at the boiler. Problem is that the pump is coming on at 2AM, 4AM, all hours. The rads upstairs have their valves open only a little so the water's quite audible. Apparently, this is the overrun from the preheat. The strange thing is that it's pumping for 30-40 minutes. The engineer's solution was to turn off the preheat, which hopefully will stop us waking up in the night (there's clanging too, but that's another story). Obviously, that means water's taking longer to heat up - not a massive problem - but if someone gets up in the night and runs the hot water, the pump stays on for ages.

Any ideas?

Boiler's an Ideal Instinct 30. Three years old, serviced every year.

Incidentally, the clanging has gotten worse recently. The engineer said it was rubbing pipes, but I'm curious as to what else it could be. Air in the system?

 

[Sharp Point]

I’m pretty sure I know the fault, but as you’re not gas safe... I’m not allowed to tell, or the powers at be,will tan me good n proper.

Sorry

 

[Riley]

I’m pretty sure I know the fault, but as you’re not gas safe... I’m not allowed to tell, or the powers at be will tan me good n proper.

Sorry

It’s true

 

[Sharp Point]

It’s true

View attachment 38287

 

[Riley]

Paddle of rebuke lives

 

[Deleted member 107929]

That's fine Bogrodder, thanks. I just wanted verification that there is a fault really. I've got a Corgi homecare thingy, so if I suspect that the engineer who came tonight might not have been entirely diligent then I'd feel justified in asking for a second opinion.

 

[Sharp Point]

That's fine Bogrodder, thanks. I just wanted verification that there is a fault really. I've got a Corgi homecare thingy, so if I suspect that the engineer who came tonight might not have been entirely diligent then I'd feel justified in asking for a second opinion.

Can I ask why you don’t turn off the preheat?

 

[Deleted member 107929]

Happy to turn it off, it just seems to mask the problem as the water flow is loud in bedroom. Lying in bed now and the pump's still going - been 90 mins since last switched HW on.