I"ve got two AC units for my house. The outside part of this split system houses both AC compressors (It's a Freus water cooled unit) in one enclosure but they have separate Fused feeds. Inside the house there are two completely separate air handlers. Each system has it's own thermostat. In the past week both thermostats have started acting funny. The backlights for them come on and then fade out or "stutter" out and the LCD digits fade away and can't be seen whether the backlight is on or off. This happens about 2 seconds after you press the buttons to raise or lower the temperature or the button to turn on the backlight. I thought each thermostat was powered by a transformer in each of the air handlers. That's how the original system with two completely separate Carrier AC units was set up. The thermostats are Braebun brand. Has anyone seen these thermostats go bad this way or should I be looking at some electric issue in the AC unit? Seems quite a coincidence both thermostats started doing this at the same time if it's a problem with the thermostats.
- posted
13 years ago