You say its not a job for a diyer but unless you use the Halstead boiler engineer then no-one carries Halstead spares, and as far as I've seen these days rgis just swap components in and out until they fix the problem. I'm wondering if anyone knows from first principles what the problem is. I'm...
Sometimes the boiler does fire up sometimes it doesn't. This is the case for hot water and central heating.
I basically switch the boiler power on and off to reset the start up sequence until it lights. The sequence is that the gas valve (I believe) makes a single clicking noise and then the...