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» Support TX1500U

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 TX1500U
   
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 Press the NEXT button 3 times then press the HOLD button once. This button sequence locks and unlocks 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? Different versions (a, b, c revisions) of this model have different ways to change setup options.  Some are DIP switches on the circuit board and some are set using the front panel buttons in a menu.  Refer to the user manual for your particular version for option settings.
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 button 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 Different versions (a, b, c revisions) of this model have different ways to change setup options.  Some are DIP switches on the circuit board and some are set using the front panel buttons in a menu.  Refer to the user manual for your particular version for option settings.
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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