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Heating, Air Conditioning, Fridge, HVAC/trane heat pump thermostat won't work



We have two units in our house. The downstairs is a trane heat pump and the thermastat may be a trane XL800, I'm not sure. Last night one of my kids turned up the heat from 68 to 89 degrees. (no one will confess) This morning the aux or emer heat was running and would not shut off. I turned the unit off using the system options. Now it won't turn back on. I had to go to work and I just checked with the kids and the system buttons still won't respond but the backlight comes on. Please help.


You may want to replace the three AAA batteries for starters below is a troubleshooting guide page 47 48 is a general Q & A . Says

Q: Some or all keys on the display do not work; why?
A: Comfort control screen is locked. See Advanced Setting section to unlock keys on the screen

Q : Why doesn’t the comfort control respond when I touch the keys?
A: Check to determine if the screen is in the Locked or Clean mode. See Screen Locked or Cleaning in Comfort Control Screen section.

Trane XL800 Deluxe Programmable Thermostat - Bay Area Services › Trane Products › Trane Thermostats
Trane deluxe programmable thermostats put comfort in your hands. Full of features, you can set it and forget it, or manage your home manually.

There are literally hundreds of thermostats out there , unfortunately I only deal with a handful and not  familiar  with this model.  

Heating, Air Conditioning, Fridge, HVAC

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.


Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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