Ecobee thermostat needing a C wire, Unused blue wire in furnace


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Old 07-17-19, 09:32 AM
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Ecobee thermostat needing a C wire, Unused blue wire in furnace

I recently bought an Ecobee thermostat and itís needing a c wire to be connected. Upon looking through the wires from the thermostat there was a blue wire tucked away in the wall. When I looked inside the a/c unit this blue wire is not connected to anything. I have a Rhemm rhll-hm3821ja model. I want to assume that this is the common wire. Iím unsure of what to do at this point or what to connect it to if possible. It looks like thereís a brown wire connected to the c terminal on the control panel that is then connected to a black wire. Thatís where Iím confused. Any help would be greatly appreciated.
 
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Last edited by Crente827; 07-17-19 at 10:00 AM.
  #2  
Old 07-17-19, 02:03 PM
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Hi, if you trace that brown wire it should go to one side of the transformer, if so connect the blue to the black and brown.
Geo
 
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Old 07-17-19, 04:21 PM
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Thank you very much Geo, it worked.
 
 

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