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thanks for the quick reply, chr15. no, this one has only one PCB, which looks like this: http://i8.ebayimg.com/04/i/07/3c/12/30_1_b.JPG the flame sensor electrode -- how do I check it ? I checked the lead from it to the PCB, no problem. it is quite a thick wire. the sensor itself is inside...

hello everyone my boiler is giving me grief again. it used to cycle pretty often and I wasn't able to fix it, even after replacing the DHW sensor. I might be wrong, but it looked like it never modulated the flame. now it developed a much worse problem. when I turn CH or DHW on, it starts...