Potterton Combi 80. Hot water, no CH

[vio2904]

Hi,
I have a Potterton Combi 80. It's 10 years old and was installed by the last owner.
Suddenly the central heating has stopped working. Hot water still works perfectly.
Any ideas as to why this might be?
Thanks for any help,

 

[fixter1]

poss roomstat/timer

 

[Gordon T]

Sounds like the controls are not calling for heat. Get someone in to look at it. It could be a very simple repair.

 

[Destroyer2813]

Diverter or motor or controls

 

[Anton]

When you put the heating on, does the boiler keep firing up for very short periods and then go off?
This boiler has a diverter valve which has a wax capsule component on the front of it, when you run a hot tap, cold water runs across the capsule and puts the diverter into the hot water mode. Check for a dripping/dribbling hot tap somewhere in the house. This can be sufficient to keep the diverter in hot water mode and prevent the heat going out of the diverter valve to the radiators.

 

[vio2904]

We do also have a very small leak in the bathroom.... thanks for this advice!

 

[fixter1]

dose it do anything when calling for heat

 

[vio2904]

Does this mean that if the dripping tap is fixed then the heating will work???? Or does the diverter and/or the wax capsule need changing?
Many thanks

 

[vio2904]

It fires up for say 20 seconds, then stops and steam comes out of the top of the boiler. (not a technical answer, I know, but I'm no plumber!)

 

[Anton]

Is the pump running?
As I recall with these boilers, the heat exchanger is a crossflow type and the water can heat even if the pump is not turning.
If steam is coming out of the auto air vent at the top of the boiler left hand side, it looks like yer pump is stuck, it'll be a myson
pump which would explain it. You need to call in a GRI to fix that.

 

[vio2904]

Thanks Anton. I'll look into a myson pump and sort the leaking tap in the bathroom!

 

[vio2904]

Anton,
Any ideas on where to find a good Oxford based plumber (apart from the obviously Yellow Pages!!)

 

[Anton]

I'd fix the leaking hot tap 1st and try it again. Alternatively you could shut the cold mains off on your stop tap and open the kitchen cold tap to let the mains pressure out, and try the heating again. If the heating works then you know for sure it was your leaky hot tap causing the problem. It'll give you confirmation one way or 'tother. If that doesn't work then I would think your pump had seized.

 

[Anton]

I am a newbie here, but I think there is a forum on here where you can shout for a plumber for your locality.
Perhaps one of the oldies can answer that one.
Good luck.

 

[Puddle]

Anton,
Any ideas on where to find a good Oxford based plumber (apart from the obviously Yellow Pages!!)

Hi

Why not try a post here

[DLMURL="http://www.ukplumbersforums.co.uk/im-looking-plumber-gas-engineer/"]I'm looking for a Plumber or Gas engineer.[/DLMURL]