have a 20 year old boiler- gravity flow, pilot light, with a hot water cylinder in the airing cupboard. recently (a week ago) had a plumber drain the boiler to sort out problems with radiators (also fitting thermostatic valves all over the house on the radiators). since then (maybe coincidentally?) the boiler is misbehaving. on manually lighting it, the pilot comes on, the boiler fires up, can see the flames clearly, then the flames gutter and go out. (i can see a lot of yellow flames- is that unusual? i thought they would be all blue.) after repeated attempts, the boiler stays on when left on a continous timer setting. leaving it on a twice a day setting, the pilot goes out and the boiler does not heat up. what could the possible problems be? is the boiler kaput? any help appreciated.
- posted
19 years ago