I have a 35 year old Utica PEG-187S steam boiler running on a millivolt system. The gas control consists of a Honeywell
VS820 with powerpile.
The boiler will not fire up unless I momentarily short the two wires going to the TH terminals on the gas control. Once the
boiler runs, it turns off on its own when the programmed temperature setting is reached.
The pilot light works. I checked all the wiring and the low water cutoff switch.
Can anyone suggest what may be causing this problem?