how can i fix my worcester 28cdi ?

check gas valve working is it powerd up

ray
February 2011

Simple check, make sure the gas is on and available (don't just assume it is).
If the gas is available to boiler and you have sparking but no burner, test for power to the gas valve when sparking occurs.

Power = gas valve faulty
No power = suspect relay on pcb.

Carefree
February 2011