My boiler runs oK on CH & hot water. However if I shut the CH off from the Controller ,the Boiler keeps running & very shortly the temp in the heat exchanger causes the safety valve to operate - it then shuts down because of "Flame-Out". If it used for HW only using the Pre Heat facility, when max temp is reached i.e. 80degrees, the boiler keeps running & after a short time the Auto-valve operates & the Flame-out flashes.
Anyone with similar problem? Would be grateful for guidance. I should say that in all other respects the unit is OK. Recently serviced!

edward james, August 2008

when you refer to the safety valve and auto valve, are you refering to the same thing?, or do you mean 2 different things?

LTGF, August 2008