The pilot light on my Apollo30/50 boiler lights but the main boiler will not light this happens when it is on either high temp or low temp .

Jean, February 2009

Look through the little window and check the pilot flame is heating up the thermocouple tip properly. It should be all around the tip. If it's not hot enough or if the thermocouple tip is burnt away, the gas valve will not allow gas to the main burner. Mine burn out every 18months in an Apollo 60/80. £7 at a plumbers merchants, but you shouldn't dismantle the boiler unless you know what you are doing. ( I've kept mine going for 26 years, only that b----y thermocouple goes wrong!)

BryanL, February 2009

Had the same question last night.With the boiler in the on position can you get a multimeter and check across the gasvalve.If 240 volts is present then the solenoid operator has packed in.

Tony S, February 2009