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» Support TX500E

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 TX500E
   
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 inset RESET button behind the door of your unit using a small Philips screw driver. Reconfigure and reprogram as necessary.
No backlight on display The TX500E does not come with a backlight.
Blank or fading display If the thermostat is battery powered only, replace its  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 inset RESET button behind the door of your unit using a small Philips screw driver. Reconfigure and reprogram as necessary.
Thermostat is locked or cant adjust display Press the NEXT button three times then press the HOLD button once, this key sequence locks and unlocks your thermostat.
Displays "LO BATT", "REPLACE", or battery symbol 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.
Displays wrong room temperature See Temperature Regulation
You want to change the displayed temperature scale from °F to °C or from °C to °F U5 on back of the unit contains three small OPTION SWITCHES that control its settings. Switch 2 controls  the TX500E displayed temperature scale. Place this switch  to its OFF position to use the Fahrenheit scale. Use the alternate position (marked ON)  to use the Celsius scale. Press the small white HW RESET button on the circuit board to effect the change.
You want to change clock format from 12Hr Standard Time to 24Hr Military Time or from 24Hr Military to 12Hr Standard Time U5 on your units circuit board contains three small switches that control its settings. Switch 1 controls the TX500E displayed time format.  Place this switch to its OFF position to use the 12Hr format. Place this switch  to its alternate position (marked ON)  to use 24Hr military time format. Press the small white HW RESET button on the circuit board to effect the change.
Displays wrong day or time Rotate the Speed Dial® to "SET DAY/TIME". The day will flash, use UP key to correct day. Press NEXT.  The time will flash. Use UP and DOWN keys to go to correct time. Rotate dial back to RUN.
Displays no set temperature The system switch must be in the HEAT or COOL position. Then if no program temperature is visible, Press RESET using a small Philips screw driver. Reconfigure and reprogram.
Shows "888" on display Press RESET using a small Philips screw driver. Reconfigure and reprogram.
Shows "OL" "OL" means Out of Limits. The sensor is reading outside the thermostats display limit of 32°F to 95°F. When the temperature returns to within these limits the temperature display will reappear. If actual room temp is not outside these limits, there may be a malfunction. Press RESET using a small Philips screw driver. Reconfigure and reprogram.
Displays "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.
For further assistance: Contact your HVAC service company or our Technical Assistance Line if not resolved.
 
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