Boiler On Off On Off

Joined
18 Dec 2007
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Location
Edinburgh
Country
United Kingdom
Hi

I have a problem with my Ravenheat Whitestar.

When the hot tap is opened, the boiler starts ok, then the pilot light goes after a minute, then it comes back on, then goes again. Occasionally it will stay on for a while.

Sometimes, especially with the central heating, the boiler will not come on at all.

Is this a problem with the electrics do you think, and any ideas as to how much this might cost to fix?
 
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This is an unusual fault for ravenheats usually they just go off off off off.
 
On the HW side it's usually a blocked secondary heat exchanger - do a search on that one,
CH - is it because it's waiting to cool down, or because it's been on in the last few minutes? I think there's a delay of about 4 mins.
 

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