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Tom, HVAC Technician
Category: HVAC
Satisfied Customers: 770
Experience:  16+yrs HVAC/R service. Residential Commerical Industrial
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i have an braeburn 3200 digital thermostat in my house. Had

Customer Question

i have an braeburn 3200 digital thermostat in my house. Had no problems until today. It has shut off, n0 display or nothing. A family friend came over with a voltage detector, and check power on unit under house, fuse looked great and was showing full power, then we checked power to heat pump also showing full power, checked power on thermostat also showed correct voltage. Flipped breakers on and off no change. Its obviously in the thermostat itself, please i need some suggestions, its 95 degrees here and we have three small children in the home.
Submitted: 6 years ago.
Category: HVAC
Expert:  Joan-Mod replied 6 years ago.
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Expert:  Tom replied 6 years ago.
So you're getting 24 volts at the thermostat?

Customer: replied 6 years ago.
Im actually getting 60.
Expert:  Tom replied 6 years ago.

If you check from Rh/Rc to C you should only be getting 24 to 27 volts.


If you connect Rh/Rc to Y (bypassing thermostat) you should get it to cool.


If you're truly getting 60 volts something is wrong. What terminals where you checking across?



Customer: replied 6 years ago.
All of them.
Expert:  Tom replied 6 years ago.

The control transformer in the furnace should only be putting out 24 volts. I'm wondering if it damaged your thermostat.


R is the 24 volt 'hot' lead from the transformer,usually colored red. From R to any other terminal should be 24 - 27 volts.


I wouldn't hook up another transformer until you figure out what's going on with that one. This is a pretty unusual problem.


Generally when a tranformer goes it goes open circuit and it's done. A high voltage is almost unheard of.


Double check your meter to make sure it's not doing somthing wacky. Then I would verify voltages right at the terminal strip in the furnace unit. R to C should only be 24 volts.


If it's more it's possible it's done damage to the control board also.