Home Support FAQ's Contact About LUX Press Room
Press Release 
Lux Thermostats Blog
Blog
Facebook
Facebook
Twitter
Twitter
 
<< back to support page
» Support DHP2120

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 DHP2120
   
Problem Resolution
Display will not change Peel protective plastic label from display.
Display blurred and unreadable Peel protective plastic label from display.
Press the reset button on the thermostat.
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.
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 A jumper comprised of three small pins on the units circuit board and a black shorting device control the units displayed temperature scale. Refer to the table on the unit circuit board and place the shorting device over the appropriate pins to use the desired temperature scale. Then press the reset button.
Shows "OL" on display This means Out of Limit. The sensor is reading outside the thermostats display limit. Room temperature will reappear when the temperature returns to switching the range.  If actual room temp is not below freezing or above 99F/32C degrees, there may be a malfunction. Press the reset button on the thermostat. 
Shows "888" on display Remove unit from wall and remove its batteries if they are installed. Wait for at least 6 minutes and replace.
For further assistance: Contact your HVAC service company or our Technical Assistance Line if not resolved.
 
Top