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» Support TX9100U

Troubleshooting the Display
  • Problems that may be identified from the display of your programmable thermostat are listed here with suggested resolutions.
  • For more detailed information please refer to the instructions that came with your thermostat.
  • The instruction manual for this model can be viewed in PDF format by clicking here.

Model TX9100U
   
Problem Resolution
Display will not change Peel protective plastic label from display.
Display blurred and unreadable Peel protective plastic label from display.
Press the small round HW_RESET button on the rear of your unit 
Blank or fading display Replace thermostat  batteries with fresh AA size Duracell® or Energizer® alkaline batteries. Be sure that they are installed with their polarity (+ and -) correct.
Clean battery contacts with a pencil eraser and pry out the spring contact slightly to insure a clean, firm connection.
Press the small round HW_RESET button on the rear of your unit 
Display is locked or will not respond A lock code is needed to unlock this thermostat. To unlock the thermostat with the lock code press the NEXT button down for at least 2 seconds, then enter the code by using the NEXT button to advance to the next digit. Once entered press the NEXT button down until it returns to the default display. To unlock the thermostat with out the lock code, press the HW_RST button located on the back of the thermostat.
Displays reads "LO BATT" Replace thermostat  batteries with fresh AA size Duracell® or Energizer® alkaline batteries. Be sure that they are installed with their polarity (+ and -) correct.
Clean battery contacts with a pencil eraser and pry out the spring contact slightly to insure a clean, firm connection.
Display reads "STG. 2" or "AUX" "STG. 2" is displayed when the thermostat is turning on the first and second stages of a conventional heating system. "AUX" is displayed when the thermostat is turning on the first and auxiliary heating stages on a heat pump.
How do I set my thermostat to act as a manual thermostat? How do I remove the programming? Place dip switch #2 located on the back of the thermostat to the ON position and press the HW_RST button. This will remove the programming features from your thermostat.
Display reads "OVERRIDE" "Override" appears on the display when the set temp is raised or lowered from the program temperature. Overrides are terminated at the next scheduled program period when the unit will revert to the program temperature and the "Override" indicator will be extinguished.
What is the EMER/Copy button The EMER/Copy button is for copying temperature programs for heat/cool programming periods. The EMER setting is used with heat pump systems that have an emergency heat heating element. This feature disables the heat pump and allows only the emergency heat feature to operate.
Displays wrong room temperature. See Temperature Regulation. 
You want to change the displayed temperature scale from °F to °C or from °C to °F On the back of the thermostat are a block of small switches numbered 1 through 8. Switch 4 will change the thermostat between C and F. In the ON position the thermostat will read C and in the default OFF position it will read F. Anytime you change an option switch you must press the HW_RST button for the changes to take effect. 
Shows "8888" on display Slide the SET switch to DAY/TIME; then set the day and time. 
Shows "HI" or "LO" This means Out of Limit. The sensor is reading outside the thermostats display limit. Room temperature will reappear when the temperature returns to normal range.  If actual room temp is not below freezing or above 99F/32C degrees, there may be a malfunction. Press the HW_RST button on the circuit board to reset. 
For further assistance: Contact your HVAC service company or our Technical Assistance Line if not resolved.
 
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