I've just been to look at one of these which was not rectifying and cutting out after a few seconds. When I got there it turned out that the fella was a bit of a messer who had been having a go at it himself. He'd put a new diaphragm in and had a play round with the burner pressure adjustment (why). It had a bad drip from the gland nut at the front of the diaphragm housing, so I was reluctant to do too much to it until that is fixed. But I cleaned the electrodes and connections and got it going. However, when up to temperature it cut out and restarted etc. so I have left it switched off and electrically isolated for now. My plan is to go back to it tomorrow evening with a new gland seal and a temperature sensor, but I wondered if anyone has any suggestions as to what else to look for.
