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» Support DMH110

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 DMH110
   
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 on the front of your unit using a small Philips screw driver.
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 inset RESET button on the front of your unit using a small Philips screw driver.
The word HEAT and/or COOL is not displayed  The words "HEAT" or "COOL" are not visible on the display on this thermostat. Some of our manuals are misprinted and read that the display will show the words "HEAT" and "COOL", this thermostat does not have that ability.
What does the SAVE feature do The Save button allows you to use one button press to easily decrease the SET temperature in winter and increase the SET temperature during summer. Whenever you leave the house, touch the Save button to put it in Save mode, the word SAVE will be on the display. By default this will add 5 degrees to your set temperature in cooling and subtract 5 degrees from your set temperature in heating. When you return, touch the Save button again to cancel the Save mode and return your home to your previous SET temperature. 
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 incorrect 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 two small pins on the units circuit board and a black shorting device control the units displayed temperature scale. Place the shorting device over both pins to use  the Celsius scale and over only one pin (either one) to use the Fahrenheit scale. Then press RESET using a small Philips screw driver.
Shows "OL" 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 over 95 degrees, there may be a malfunction. Press the HW RESET button on the circuit board to reset. 
Display will not light  Some display backlights are difficult to see in a lighted room. Check the backlight in a darkened area.
  If the thermostat has batteries installed, replace them with fresh Duracell® or Energizer® alkaline batteries.
  Clean the contacts holding the batteries in place with a pencil eraser.
 
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