I have an apprxly 25 year old weil-mcclain boiler. HE4 Series 3
It has a Fenwal ignition module (05-212226-103)
I've been having more and more issues with it not completing ignition sequence successfully.
The thermostat calls for heat and HSI glows every time for the allotted time of 40 seconds. If it works properly the gas valve clicks and then full gas fires. When unit fires there's 24vac on the gas valve, if not reads 0.
It's becoming more regular now that it glows for 40 and then there's no click. In this case the boiler continues with the pumps, fans..etc running but no fire in the box.
Tuned about 10 days ago and has been running ok until the last day now with probably more misfires than ignitions. Before had run for a week or 2 with maybe 1 or 2 occurrences.
The board is set with 1 try and then lockout. Older board that doesn't have any flashing lights for diagnostics.
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