Original message
| dragonfly1234
 |  "Thermostat Problem?"
, posted Wed 30 Jul 19:08  
I have a RTH7400 with no display at all- just the green backlight. I took it off the wall and tried to check voltages at different points, but I'm not getting anything(I hope I'm doing this correctly). I would appreciate any help you could give me before I give up and call a professional. Thanks
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Replies:
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| Houston204
| "Re(1):Thermostat Problem?" , posted Wed 30 Jul 19:43
Does it have no display when removed from the wall with fresh batteries?
"Tip of the Day" Remember to remove power first.
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| | dragonfly1234
| "Re(2):Thermostat Problem?" , posted Wed 30 Jul 20:46
It is the same on or off the wall(I did put fresh batteries in after the problem started)...nothing on the display- only the green backlight if I press a button.
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| | Houston204
| "Re(3):Thermostat Problem?" , posted Thu 31 Jul 07:26
Verify your old batteries haven't leaked, causing the batteriy terminals to corrode.
Jumper R to G (probably red to green) to verify that your fan will run.
If the fan runs when jumpered replace the stat.
"Tip of the Day" Remember to remove power first.
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| | dragonfly1234
| "Re(4):Thermostat Problem?" , posted Thu 31 Jul 08:19
The battery terminals look ok and the fan starts up as soon as I put the thermostat back on...When I pull it off the wall, the fan stops. Do you think the thermostat has gone bad? It is less than 2 years old, but I guess they don't make things like they used to(my old one lasted 10 or more years)Thanks for anymore info you can give me.
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