No Common Wire For Digital Thermostat - http://www.hvacmechanic.com/ Forums
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Replies:
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| xenos
Webmaster 
|  "Re(1):No Common Wire For Digital Thermostat"
, posted Fri 4 Jun 16:22  
Yes you will have to run a new wire, actually I believe all multi stage heat pump thermostat have a common. Even most mercury ones. Are you sure you don’t have a common? most heat pump thermostats use light bulbs that require common’s
Xenos.
The best way to escape a problem is to solve it.
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| | jludwig
| "Re(2):No Common Wire For Digital Thermostat" , posted Fri 4 Jun 16:30
The wire appears to be an 8 or 10 count wire, with 6 of the colors being used. The mercury thermostat does have several lights for emergency heat, auxilary heat and a 3rd which I can't recall offhand. Is there a way to check for common with a multi meter or other tester?
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| | xenos
Webmaster
| "Re(3):No Common Wire For Digital Thermostat" , posted Fri 4 Jun 16:55
What thermostat is it, Common will be either X,C or B.
Xenos.
The best way to escape a problem is to solve it.
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| | jludwig
| "Re(4):No Common Wire For Digital Thermostat" , posted Mon 7 Jun 15:47
Currently Installed is an AIR FLOW DESIGN manual thermostat with Auxilary Heat, Emergency Heat and Check Light lights. The Wires match up the following:
Green - Green
Yewllow - Yellow
Orange - Orange
Blue - X1
White - W2
Red - Red
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| | xenos
Webmaster
| "Re(5):No Common Wire For Digital Thermostat" , posted Mon 7 Jun 19:28
X1 may be common or emg heat where does it connect at the other end?
Xenos.
The best way to escape a problem is to solve it.
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