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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 CH200SA
Problem Resolution
Indicates incorrect room temperature 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 If poor performance is in Heat mode, 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.
Refer to wiring to verify that it is according to the wiring diagram for your system.
Verify that your units placement and mounting are optimum per the installation section of its manual.
Calibrate mechanism                                                     
1. Disconnect electrical power to the thermostat at the furnace, main fuse or breaker box.
2. Remove thermostat cover.
3. Locate 1 inch 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.
4a. Determine the mechanisms set temperature.
4b. Change the temperature setting to its lower, limit.
4c. Listen for a very soft click while slowly raising the temperature setting. Note the temperature at which it is heard.
4d. Now listen for a very soft click while slowly lowering the temperature setting. Note the temperature at which it is heard.
4e. Repeat as necessary to determine to temperature setting half way between the two clicks.
5a. If the center point between two clicks does not indicate room temperature the mechanism may be adjusted as follows.
5b. Hold temperature setting lever at room temperature.
5c. Firmly grasp the anticipator disk being careful not to touch the temperature sensing coil.
5d. Rotate the anticipator disk slightly.  Clockwise rotation lowers the indicator. Counter clockwise rotation raises the indicator.
6. Test the new position as in steps 4 and 5 above. Repeat adjustment and test as necessary. 
No heat when expected Verify that the wire connections to your thermostat are clean and tight.
Refer to wiring to verify that it is according to the wiring diagram for your system.
Advanced Trouble Shooting 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 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.
For further assistance: Contact your HVAC service company or our Technical Assistance Line if not resolved.