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Honeywell thermostat wiring.

Thermostat does not show the current room temperature or the selected set temperature. I removed the outside part and installed batteries. the
set and indicated temperatures then appeared but the system is not working..

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There could be several things that could cause the thermostat not to function appropriately. First, the thermostat could be installed twisted. If the thermostat is also not properly leveled, the mercury switch will definitely not give a true reading.

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