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Old 07-07-2015, 03:32 PM
 
948 posts, read 1,132,051 times
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Been going on for past few days. My trane thermostat display is blank. No battery involved. Tried resetting the breaker, exterior fuse ( I believe) next to the unit. Sometimes after trying these steps, the display comes back. Again goes blank the next day. Last nite, same scenario. Tried the same steps w/o any luck. Finally I gave up. Turned out the A/C kicked in at the set temp. but no thermostat display so I can't control it. Seems like problem with the thermostat unit itself? Do I need a new display unit? or no power feeding the display? It's 24v AC I believe.
Please advice. I am not sure I want to spent $150 on an Electrician if it's a minor issue.
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Old 07-07-2015, 04:09 PM
 
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The thermostats that I am familiar with that have a display also have a battery, they don't run off the furnace. Why do you say there is no battery involved?

If the thermostat is "rated for 24V" I believe this means it can safely handle signals that are 24V on the wiring to the furnace. It doesn't necessarily run off that 24V.

I'm sure there are people with more technical info here as well...
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Old 07-07-2015, 04:11 PM
 
948 posts, read 1,132,051 times
Reputation: 238
Quote:
Originally Posted by cordata View Post
The thermostats that I am familiar with that have a display also have a battery, they don't run off the furnace. Why do you say there is no battery involved?

If the thermostat is "rated for 24V" I believe this means it can safely handle signals that are 24V on the wiring to the furnace. It doesn't necessarily run off that 24V.

I'm sure there are people with more technical info here as well...
I did remove the front piece and didn't find any battery slot.
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Old 07-07-2015, 04:18 PM
 
1,041 posts, read 1,182,490 times
Reputation: 1444
Keep looking for the battery. Use google to find owner's manual.
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