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The backlight on the thermostat has always been on indicating

Customer Question
the is wired for 24...
The backlight on the thermostat has always been on indicating the is wired for 24 vac. Now the backlight goes on when the touchpad is touched then shuts off in a few seconds. I went to parameter 280 and the option is set at 1. Whats up?
Submitted: 2 years ago.Category: HVAC
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Answered in 26 minutes by:
4/30/2015
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,238
Experience: 51 years of experience install design and repair of all makes and models of AC
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Russ here. Welcome. I am here to help. Please do not rate until you are satisfied with answer. Always available for follow up questions. Make sure you do have a common wire to terminal C. Check to see if you have 24 volts between R and C terminals. Russ
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Customer reply replied 2 years ago
There is no C terminal. On the left side terminal strip from top to bottom are: Y2 with orange wire, F,X2,W1 with brown wire, S1, S2. On the right side terminal strip top to bottom: RC, R with red wire, O with white wire, Y with yellow wire, G with green wire, B with blue wire. This is as it has always been.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago
This is Trane so instead if C terminal is B. Russ
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HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago
Go from R to b. Russ
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