Original message
| mjandkev
 |  "System does not work with old/new thermostat"
, posted Tue 11 Nov 17:23  
I attempted to replace an old mercury thermostat with a digital one for my Nordyne systems (elect, heat pump). I since learned frol LUX that the thermostat I bought will not work on a 2 stage system. Problem is - now the old thermostat does not work either. I can't get the system to come on for heat or air. I've checked the breaker switches. Any thoughts?
KevinS
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Replies:
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| Houston204
| "Re(1):System does not work with old/new therm" , posted Tue 11 Nov 19:12
Low voltage fuse or transformer failure due to improper wiring of the new stat. (you probably wired C wrong)
Check inside of your air handler panel for a popped low voltage fuse. Usually 3 or 5 amp.
Some units have a low voltage breaker
Did you remember to write down the existing terminal = wire combination before replacing the stat?
A Honeywell RTH7400 or a RTH7600 will support 2 stage systems.
"Tip of the Day" Remember to remove power first.
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