My five year old Worcester Bosch 350 sometimes has several attempts to
fire up when the room stat calls for heat.I can hear the main flame
come on then after about 10 secs it comes on again.(Pump keeps running
regardless) Sometimes it wont light and I have to turn the room stat
off and let it have another attempt.
It eventually fires up but it's annoying to keep coming home to a cold
house. Any pointers please? michaelangelo7