Why Is My Boiler Firing Up?

[chrissa1]

I'm sitting in my lounge with no central heating on in the house, no hot water has been used since this morning and my gas boiler fires up and stays on for about 5 minutes.

Can anyone tell me why please? I'm trying to save money.

[yogi-bear]

Hi Chrissa,

Is the thermostat turned up?

[carrust]

If it's a modern combi boiler it could be firing up to keep the hot water warm.

[ChuckFickens]

Do you have a anti-frost setting on the boiler, if so it may have dropped to a low enough temp to trigger that.... if so (unless you live in the arctic) you may want to adjust it a bit.

[chrissa1]

The CH is not turned on carrust. Is there a thermostat on the boiler?

[yogi-bear]

Could be a ghost, Chrissa......I would call Derek Acorah in, if i were you :0)

[ChuckFickens]

Or if it's a combi boiler do you have a hot tap left on a little bit.

[magsmay]

check the thermo on your hot water system -if its turned up too high the boiler will be turning on to keep it at that temperature -turn it down and the water will be cooler in your taps but you will save money -

[Baldric]

Doesn't a combi boiler do away with the hot water tank?

[knowabit]

Mine always does it. Though it was meant to?

[carrust]

Is it a combi boiler?

[douglas9401]

If you have a hot water tank the boiler's maintaining water temperature as per the settings.

[chrissa1]

NOt very helpful yogi. Lol.

There is a dial on the front of the boiler, what number should that be on? It's not a combi as there is a tank in the airing cupboard.

No hot water tap left on.

[magsmay]

we have an oil fired combi boiler and it has two thermos -one for hot water actually behind the boiler cover and one for CH which is digital on the wall. Our boiler was firing up willy nilly during the day when the CH was off and sooting up and the Plumber said it was because we had the hot water too hot and turned it down -sorted!

[carrust]

http://boards.fool.co...91198.aspx?sort=whole

[yogi-bear]

:0) sorry x.....I'll stick to playing tunes eh? x

[magsmay]

What number is the dial on at the moment Chrissa? -and what are the numbers are they say 1 - 10 or are they more like degrees ie 20C - 40C?

[RevArkwright]

Faulty PDF. Pressure differential assembly.

Sounds like the needle valve is stuck.The boiler thinks that hot water is being drawn and fires up, Because hot taps are off boiler shuts down in a min or so.

[chrissa1]

It goes from 1-6 magsmay and was on between 2 & 3.

[RevArkwright]

Need to know make and model of boiler.

[chrissa1]

Ok Rev, does that need a plumber?