I had the water pressure turned up yesterday - the water company removed a plastic restrictor valve from the water meter and now we have around 2 bar of water pressure - not great but better than what we had. Since then if we flush the loo the boiler fan comes on after the loo has filled back up. Have you any idea why this is?? Its a Baxi Platinum 24 by the way.
Boiler comes on when I flush the loo!
- Thread starter AliW
- Start date
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A "dead leg" is a section of pipework cold main or d.h.w that is still live ie connected to the cicuit that serves no purpose.Ie if you have had a combi installed but your installer has left the expansion pipe running into a loft area because it is supplying a bathroom tap but he has just capped off the end of the expansion pipe the portion that is redundant is a dead leg".Likewise if the cold main that supplied any water storage tanks in the loft have just been "capped off" these can be deemed as dead legs.Sometimes dead dead legs can cause a pressure differential in your water cicuit when you flush a toilet or open a cold tap enough for your boiler to think there is a demand.
Another possible cause is if you have a mixer tap or mixer shower that could be passing.
If it persists after all checks are sound you could install an expansion vessel on your main.
Another possible cause is if you have a mixer tap or mixer shower that could be passing.
If it persists after all checks are sound you could install an expansion vessel on your main.
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check whether the toilet water is hot. seen that done before.
seen that done before.If it's only the fan starting momentarily, I'd suggest you ignore it. What's probably happening is that there's a sudden surge of pressure in the main when the valve in the cistern closes, which fools the boiler that someone just turned on a hot tap. (Probably, as suggested, there's a dead leg somewhere in the hot water plumbing beyond the boiler.)
If the boiler is actually firing up, that's a more serious problem.
If the boiler is actually firing up, that's a more serious problem.
If its really a problem then you could probably stop it by fitting a non return valve on the hot water outlet just after the boiler.
I expect the part removed from the meter was a flow restrictor rather than anything to do with pressure.
Tony
I expect the part removed from the meter was a flow restrictor rather than anything to do with pressure.
Tony
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I was recently called to a property with dual flush valve cisterns installed. 18 months old and £ 250K. Valves had started to leak, unfortunately one of the W.C's was plumbed into the DHW supply. Combi on all the time as a result and the flexi-iso valve had been boxed into the tiling. Could have had a bath in that toilet it was so warm. Renewed flush valves and the guy is going to get on to the developer.
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