Quote:
Originally Posted by masterdrago
Doug, in one of your pix, you can see the high limit (blue wires). I found those connectors slightly corroded recently that caused a fail to fire. After cleaning them (need long needle nose pliers), worked fine.
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Just for clarification: The blue wires are thermostat wires. One provides 12VDC to the thermostat and (when the thermostat calls for heat) the other returns that 12VDC to the control board via the sail switch and the limit sensor. If you ever want to bypass the thermostat, just jumper those two blue wires together.