It's an Orion Fanfare 60Si, if that helps!

The problem was happening regularly 20 mins or so after it first came on, but would also do it later on in the evening too.

However it's been quiet for a good few days now since the boiler was reduced to 1. Also the f/e tank level is currently lower than it had been as the supply to this is  still turned off!

Wouldn't circulation problems lead to cold spots in the system? Everything is lovely and hot at the moment! And the motorised valves seem to be working ok.

So it sounds like I need to get a Corgi in to check out the gas valves....

[quote author=woodsmith  link=1105056479/15#18 date=1105949930]Oggy wrote;

"What level of water should there be in the tank? Mine was about 2/3 full with the end of the overflow dipping down below the surface"

Do you think that having the overflow pipe dipping into the water in the tank may cause a problem? As the heating cools water will be drawn up the overflow pipe and may be causing some sort of air lock which clears when the heating gets up to a certain temperature?

Just a thought  ???

Keith [/quote]
no keith, he meant the actual tank overflow, not the expansion pipe from a cylinder. It fine to have the overflow in this way, in fact thats how a by-law 30 kit comes. as the tank level drops all that will be drawn from the overflow is air, to the tank space. Still could be airlock, although not for this reason.

http://www.partsarena.com/baxi/

Fault chart can be found abovelink.

Does the main burner turn off before a flow temperature of 60c when on 1 ?

No; Disconnect main solinoid lead, does the main burner shut down ?

Yes change boiler thermostat,
No change gas valve.

scruff