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SOLVED!!! I got some decent time and light on the situation and found a water leak that was dripping ever so slowly from up inside somewhere onto the valve assembly and then seeping down over the connections and BANG! Funny thing is it only dripped when it was running. Got a temporary fix...

If you are familiar with a 'Honeywell' gas valve similar to this... ...there are two spade terminals on the valve assembly to which the thermostat/mains is connected, the arc is between these two terminals. The connectors are mounted on a plastic base, slightly recessed, and at the...

Thanks for the replies guys. I got a reading of 3.5K across the terminals, is that good or bad? Would a faulty suppressor cause this kind of arc? I know inductive currents can be quite high, but it suprises me that a faulty supressor would be having this kind of effect. Chris

The last couple of days, our boiler has been throwing the trip. It's an 'older' boiler, a Stelrad Ideal W. Being older it's easy to diagnose and fix I hope! I've traced the problem to the boiler, and on opening the small 'control' box found the thermostat control, a suppressor and the...