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Please explain what you mean by "IT BURST INTO FLAMES".
Sorry I had to step away for a few
It sounds like the flames damaged the boiler control(s). Is there any obvious damage?
If there's no obvious damage then the fusible link is the most likely culprit.
It's located on a bracket just above and outside the burner chamber
You can connect the 2 leads for testing purposes only. It's a 1 time device. If the unit starts with it jumped then replace it
The manual doesn't give me any good info on the type. If looks like the attached pic then you can get one at any plumbing supply house maybe even the big box stores.
Do you have a multi meter?
Ok, test for 24 vac across TH & GND terminals on the ignition control. If you have no voltage there then check for 24 vac at the transformer secondary. My schematic shows yellow and red as transformer secondary leads.
Just come back to this thread. It won't go away and I'll respond as soon as I can. I'm online 8 am to 7 pm EDT more or less.
How did it work out? do you still need help?