Heating On When Not Required?

TAFF-FINN · 17 Jul 2006

I am a complete ignoramus with all things DIY so I apologise in advance.

My problem - Combi system in my new home (system about 4 years old I believe)heats radiators whether I select hot water only or hot water & heating regardless?

I have had an electrician check the boilers wiring and that is OK so not sure where to go next (spoke to a mate of a mate who mentioned something about bypasses?)

Wanted to check it wasn't anything obvious before forking out on a plumber.

Any advice greatly appreciated.

ChrisR · 17 Jul 2006

What combi is it? Has it got "instant" in the name?

Agile · 17 Jul 2006

Quote:

"""I have had an electrician check the boilers wiring and that is OK so not sure where to go next (spoke to a mate of a mate who mentioned something about bypasses?)

Wanted to check it wasn't anything obvious before forking out on a plumber."""

That implies that you think that a plumber is VERY expensive.

It might have saved the cost of an electrician.

Until we know the model of boiler you have its difficult for us to guess.

It sounds as if your boiler has a fault !

Perhaps you have a Vaillant 824 or 828 ? If so these have a design fault built into them to cause the diverter valve to get stickey after about 2-3 years. If not then what is it?

Tony Glazier

TAFF-FINN · 18 Jul 2006

The electrician was my Father in law so no $$ changed hands.

The model is a Baxi Combi 80 Eco.

Hope that is of help, should have put it in first place really.

ChrisR · 18 Jul 2006

If you select hot water only, but the taps off, does the boiler come on to heat the rads?

Or do you mean that the rads heat up when the water is run?

If the latter, then it's dirt in the system causing the 3 way valve to not shut so letting water round the wrong way.

TAFF-FINN · 19 Jul 2006

If hot water only is selected even without the taps being run to draw hot water the rads heat up.

TAFF-FINN · 19 Jul 2006

Just got this reply from another forum does anyone here concur?

"Sounds like your diverter valve has failed. You need a Corgi registered gas engineer. Shouldn't be too expensive".

weargas · 19 Jul 2006

It's your dhw microswitch that's knackered, common problem on the eco's. The new one comes with a wiring harness attached so it's better to get a corgi repair engineer to do. The part number is 248207.

TAFF-FINN · 28 Jul 2006

Not tried anything else as I said I am a DIY disaster so would rather get the advice of someone like yourself who knows first.

Sorry for delay in replying been away for a few weeks.

Agile · 29 Jul 2006

The sooner you get the switch replaced the sooner it will be working!

Doesn't say much for the diagnostic skills of the electrician!

Better use a good boiler next time!

Tony

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Heating On When Not Required?

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