Confirm you have a C wire in the C terminal. A C wire connected to C on the equipment is required for the thermostat to power itself.
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The 24 volts comes from a low voltage transformer.
Why is my honeywell thermostat not turning on. Why does my thermostat not have 24 volts. Honeywell thermostat problems can be frustrating especially when its a blistering hot or freezing cold day. If the contactor is not getting the 24 volts to the contactor coil then it could be a time delay relay if the unit is equipped thermostat.
If your previous thermostat did not. If the Honeywell thermostat screen is not. Verify the furnace air handler door is closed the power switch is on and the breakers are on.
Common issues include display problems heatingcooling issues or Wifi connectivity trouble.
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