Hi, ive read many threads but cant seem to find the fault my boiler has. Its a sabre boiler but i cant find model number on it??

Boiler starts up and runs for about 5 min then cuts out with a constant red light showing but if im running hot water the boiler is ok and does not cut out and does not show a red light but again when water goes off boiler cuts out.

Anyone else had the same problem?

Any help greatly appreciated

Neil., January 2012

Think im managing to figure out the problem a little better.

The radiators are heating up, but they then seem to be overheating and im sure this is why the boiler is doing a safety shut off, as it will switch back on but the time it spends working is less due to the fact that the radiators are at a hot temp.
I also beleive that the heating continues to work when the hot water is running because the excess heat is being passed through the running water allowing the central heating to stay on.

Hope this helps you heating gurus to help me in diagnosing the fault accurately.

Cheers!

Neil., January 2012

Hi,
Appreciate the quick reply, thank you.
Boiler pressure ok.
Not sure what you mean by central heating pump running, the centaral heating does fire up and run, hot radiators, but then boiler cuts out. central heating and boiler work fine when hot water running through taps.

Neil, January 2012

boiler bar pressure set correctly?
is CH pump running?

Quest, January 2012