I’ve got a rooftop HVAC unit that apparently won’t light. The little evac fan comes on, the gas valve opens, but the igniter won’t light. I’ve checked continuity on the igniter probes and there doesn’t seem to be a problem there. The thermostat above the 4 orifices (high-limit stat?) has continuity. I suspect that the unit is just not sending any juice up there. Any ideas? It’s a 4 ton AC unit, I believe it’s 100,000 BTU heater (4 jets). My neighbor next door has the same unit (maybe smaller, but same brand) both same age (we did both at once) INstalled new 11/00.
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