I have a Potterton Flamingo which is nearly 18 years old. A couple of weeks ago the overheat thermostat tripped causing the flame to go out. It took many attempts to get the pilot light to relight but in the end I was successful. The boiler has been fine until today when we noticed the house was getting cold. Again the overheat thermostat has tripped but this time I can't get the pilot light to light. The pump seems to be working fine as I can feel and hear it humming. Any ideas or should I now buy a new boiler.
Out of Interest we had a radiator removed from the hall, a bedroom radiator enlarged and an additional large radiator fed from that bedroom for a garage conversion last March. This did cause the overheat thermostat to trip 24 hours later but the plumber said there was an airlock. The system has been fine since that date and has not been adjusted for temperature.