Home Support FAQ's Contact About LUX Press Room
Press Release 
Lux Thermostats Blog
Blog
Facebook
Facebook
Twitter
Twitter
 
<< back to support page
ยป Support T20-1141SA

Troubleshooting Poor Temperature Regulation
• This page lists problems that may affect the temperature performance of your LUX thermostat 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 T20-1141SA
   
Problem Resolution
Indicates incorrect room temperature
  1. Remove the cover. Locate circular pointer attachment on rear of cover. Adjust temperature reading by rotating the pointer attachment so that the indicated temperature is correct.
 
Heats or cools more than 5 degrees past
its displayed set temperature
  1. Refer to the installation section of the thermostats manual to verify that the units anticipator is set appropriately. Note that it may be adjusted from the recommended setting to accommodate your preferences.
  2. Refer to wiring to verify that it is according to the wiring diagram for your system.
  3. Verify that your units placement and mounting are optimum per the installation section of it's manual.
  4. Calibrate mechanism
 
4a Disconnect electrical power to the thermostat at the furnace, main fuse or breaker box.
4b. Remove thermostat cover.
4c. Locate 1 inch diameter disc with pointer. This is the anticipator disk. Behind it is the units temperature sensing coil. The end protruding from it is the contact arm.
4d. Rotate temperature dial to lowest setting. Listen carefully for a small click while slowly rotating the units dial to higher settings. Note the temperature at which the click is heard.
4e. Listen carefully for a small click while slowly rotating the units dial back to lower settings. Again note the temperature at which the click is heard.
4f. The center point between two clicks should be the at room temperature. Repeat steps 4d and 4e above until you are sure of the center point.
4g. If the center point between two clicks does not indicate room temperature the mechanism may adjusted as follows.
4h. Hold temperature setting lever at room temperature.
4i. Firmly grasp the anticipator disk being careful not to touch the temperature sensing coil.
4j. Rotate the anticipator disk slightly. Clockwise rotation lowers the indicator. Counter clockwise rotation raises the indicator.
4k. Test the new position as in step 3 above. Repeat adjustment and test as necessary.
 
No heat when expected.
  1. Verify that the wire connections to your thermostat are clean and tight.
  2. Refer to wiring to verify that it is according to the wiring diagram for your system.
   
Advanced Trouble Shooting
  1. If your system is a low voltage system having 24VAC or less, and you are technically inclined, you may jump terminals as given below out to detect a malfunction in your system.
   

Heat Test

  1. To test gas or oil heating systems, take the either wire off its terminal. Then with the power ON at the fuse box, touch that wire to the other terminal for a couple of minutes. The heater should come on and stay on until the wire is removed.
   
 
  1. Contact your HVAC service company or our
    Technical Assistance Line if not resolved.
 
Top