boiler will not come on using timer, have fitted new timer clock, new air pressure switch and new circit board. if i thump the front panal it then ignites, once it is running on constant there is no problem it keeps going doesent stop and start. HELP!!!
worcester combi 24i
- Thread starter BHF
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Simple, it needs a new thump switch 
Does it work if you turn off power at mains wait a few seconds and switch back on, if so sounds like pcb u/s or at least a relay on it, regardless of it being replaced one.
If not and it starts by vibration could be loose wiring connector or sticking relay. Check wiring connections to board, if tight then get another board from ebay.
If not and it starts by vibration could be loose wiring connector or sticking relay. Check wiring connections to board, if tight then get another board from ebay.
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