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Someone told me they thought it was the High Limit Switch, but how do I check for this. The fan does not come on for Heat Forced Air (roof mounted central air & heat) System. The fan does not work...

I checked the thermostat fuse and it appears to be good, and the HG Switch is in correct position, and the fan does not engages in either the "auto" or "ON" (manual override) positions. One person...