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Dilo

Dilo

Need help wiring a new thermostat at the furnace. Have an oil burner, hot water system. (No A/C). The old thermostat has the red & white wires hooked up. My thermostat WIRE has 3 wires - the green one is not being used. See first photo.   My new bluetooth thermostat requires  'C" wire, so I used the green wire for that purpose. I hooked up the C, red and white wires to the new thermostat,  and on the furnace- end of the wire, I put the green wire on a dedicated 24v terminal, leaving the existing red & white wires as is.  The thermostat would not power up.   I then moved the red thermostat wire on the furnace,  to the common terminal, leaving the white wire as is.  This made the thermostat flash on and off.   (See photo 2 of the furnace circuit board - i circled the C wire,  24v & common terminals,  and the thermostat wires in question) Finally. I then moved the white thermostat wire to where the red wire was.  I got full power and functionality to the thermostat. Was able to program it,  and even link it to my smartphone.  The issue is that it would not turn the furnace on.  It confirmed the heat was activated,  but no heat flowed in that zone. I feel I am close with the wiring,  but just not 100% there yet.   What do I need to rewire in the furnace to get this working?  Thanks for any professional insight you can provide. 

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Dilo
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  • Dilo
    Need help wiring a new thermostat at the furnace. Have an oil burner, hot water system. (No A/C). The old thermostat has the red & white wires hooked up. My thermostat WIRE has 3 wires - the green one is not being used. See first photo. 

     My new bluetooth thermostat requires  'C" wire, so I used the green wire for that purpose. I hooked up the C, red and white wires to the new thermostat,  and on the furnace- end of the wire, I put the green wire on a dedicated 24v terminal, leaving the existing red & white wires as is.  The thermostat would not power up.  

    I then moved the red thermostat wire on the furnace,  to the common terminal, leaving the white wire as is.  This made the thermostat flash on and off.   (See photo 2 of the furnace circuit board - i circled the C wire,  24v & common terminals,  and the thermostat wires in question)

    Finally. I then moved the white thermostat wire to where the red wire was.  I got full power and functionality to the thermostat. Was able to program it,  and even link it to my smartphone.  The issue is that it would not turn the furnace on.  It confirmed the heat was activated,  but no heat flowed in that zone. I feel I am close with the wiring,  but just not 100% there yet.   What do I need to rewire in the furnace to get this working?  Thanks for any professional insight you can provide. 
    January 11
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