When the room thermostat gets below temp, the boiler kicks in (pilot light and fan) and makes all the right noises but it does not seem to light up to heat the water. On a few occasions it does for just for a few short mins but then stops (fan keeps going and pilot light stays lit) Checked room theremostats etc
It's had a new relay but no joy!

Simon (s.roe@ukonline.co.uk), January 2005

Same Problem too.. You know know were I can get the Mercury Vapour Valve from do you?

Bazzo, February 2006

IF YOUR BOILER FIRES UP AND RUNS FOR A FEW MINUTES AND THEN STOPS. CHECK YOUR ROOM STAT FOR CORRECT OPERATION, ALSO CHECK THE SETTING YOU HAVE ON YOUR BOILER CONTROL, IF THIS IS TOO LOW THE BOILER WILL KEEP CUTTING OUT. I NORMALLY RUN AT 3-4 SETTING. HOPE THIS HELPS.

ERIC ILIFFE, February 2005

same here mate, turns out it is probably the mercury vapour switch.
good luck

Nick, January 2005