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I just got a new honeywell thermostat and it when i first hooked it up it wouldnt turn on so i check to find out which connections on the thermostat when open i changed my wire to make it correct now when it turns on it doesnt turn off. i only have 2 wire that were on the old thermostat and the new one shows spots for 3 wire do i need to run a 3rd wire to get the furnace to shut off after it reaches desired temp? right now i have to disconnect the thermostatto shut it off.?

Answers :

Hello my name is Heath it will be my pleasure to assit you. If you did not turn the power off to the furnace before rerplacing the thermostat then you may have burned out the board in the furnace. But first if there is a RH/Rc terminal in the new thermostat then try removing the jumper between the two and see if the thermostat will operate properly.

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I just got a new honeywell thermostat and it when i first hooked it up it wouldnt turn on so i check to find out which connections on the thermostat when open i changed my wire to make it correct now when it turns on it doesnt turn off. i only have 2 wire that were on the old thermostat and the new one shows spots for 3 wire do i need to run a 3rd wire to get the furnace to shut off after it reaches desired temp? right now i have to disconnect the thermostatto shut it off.?

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