I am replacing a mercury thermostat with Honeywell RTHL2401C. Auxiliary heat is the only heat that will work. Is it a programming problem or a wiring problem?
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I am replacing a mercury thermostat with Honeywell RTHL2401C. Auxiliary heat is the only heat that will work. Is it a programming problem or a wiring problem?
Hard to tell. Did you follow the wiring instructions which came with the stat?
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