Here's what I have:
The unit does CFH. Then SPK. It lights the pilot but the pilot assembly continues to spark. The main burner never lights. I'm trying to follow the troubleshooting guide. It says at this point I should be getting 24v across the MV-MV/PV leads. I tested this at the back of the pc board itself while all wires were plugged in. I get a jump up to like 300v according to my meter, then it drops down to zero or close to it. According to the manual, this means a bad board. Here's where I'm stuck--I'm not positive I'm testing this right & could use come help. As a sanity check, I tested across the PV-MV/PV at the back of the board in the same way. Because my pilot is lit, I figured this should be 24V, right? It spikes up to 300v or so, then goes back down to 4v.
I just feel like my testing is inconclusive & would like to know if I'm doing it right before I drop a few hundred bucks on a new board.
By the way, my first action was to just replace the pilot light assembly, so that is brand new. Replacing pilot light assembly did not solve problem.
So, am I testing this right?
Based on what you see here & your own experience do you think it's the board at this point?
Thanks for your help, I have not posted in a while, but always appreciate your guidance.
Hopefully this makes sense, let me know if I can help clarify my problem.