Simon may i thank you for your suggestion on checking the polarity.
You were absolutely spot on. The wiring was reversed in the fused spur to the boiler. All put back as it should be and the boiler fired up first time. Thanks once again
Mark
My boiler pilot lights instantly on demand for hot water and heating but it wont go to main flame plus the igniter keeps going then after 20 seconds it goes to flame lockout. I've had an engineer out who changed the igniterand lead, new main PCB board and igniter PCB. Still no good so he tapped...
i have a ravenheat 82e that wont go to main flame. The pilot lights but the igniter keeps going and then it all stops and the pilot goes out and goes into flame lockout after about 20 seconds. my igniter only has 1 wire on but it says in the manual that i have a flame sensor but i can find one...