winter heat no ac now! - http://www.hvacmechanic.com/ Forums
Original message
| David1983
 |  "winter heat no ac now!"
, posted Tue 8 Jun 13:44  
Replaced old thermostat with Honeywell CT87B. Heat worked last winter but now we get no AC. We have red, blue, white and green wires.
Connected Red to Rh
Green to G
White to W
Blue to Y...
First tried above and it didn't work..then
Per manual pic installed jumper from Rh to Rc...still no AC. Should BLUE still be on Y? How can I test if compressor works?
Havoc!
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Replies:
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| xenos
Webmaster 
|  "Re(1):winter heat no ac now!"
, posted Tue 8 Jun 17:59
Y is the compressor wire.
Xenos.
The best way to escape a problem is to solve it.
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| TechMaster
| "Re(1):winter heat no ac now!" , posted Tue 8 Jun 17:14
You do need the Rh-Rc jumper on a 4 wire system. You can try putting red, green, and blue together to see if the fan and compressor runs. If you do this with the thermostat removed and it runs then there's a problem with the thermostat.
Keep Cool!
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| | David1983
| "Re(2):winter heat no ac now!" , posted Wed 9 Jun 09:12
Thanks very much...went to Walmart bought new thermostadt, re-installed the same way and YES! YES! WE GOT AIR!
Havoc!
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