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DP, thanks for the explanation. Makes a bit more sense now, although I don't get the part where the flame acts as a path to earth - I thought the pilot burner was that path. You may be right, Chris, about the electrode CONTRIBUTING to the earth current if something else has a bit of a leak...

I think I've sorted it. A mate told me to try an isolating transformer on the mains supply to the boiler. This had some strange effects. The boiler would light but the ignition kept going after the burner lit and the pump only ran when the control switch was OFF. Disconnecting the tranny it...

Had another go at it this morning and it ran ok for a couple of minutes then the RCD tripped. Disconnected the fan & it's ok in as much as the pump runs. Recon fan and pop! RCD goes again. Took fan & sequence board to supplier & tested ok. Put fan back on and it ran for about 25 minutes. RCD...

Thanks for coming back so quickly. I'm sure it's not the pump because the pump starts runs ok when the controls (timer & stat) are turned on. Like I said, the fan starts ok and runs for a few seconds before the ignition stage. One click, then it trips. That's what makes me think it's the gas...

My ex has a Glowworm Fuelsaver F that I fitted a new fan to last year. (another story) Some months later, it started blowing the fuse on the PCB and every time I tested it, everything was ok. No shorts & no earths. The last fuse lasted about 4 months until today when the RCD tripped just after...