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General Thermostat Questions

LUX Thermostat Questions

Troubleshooting FAQ's

 

FAQ's
Troubleshooting
  1. My thermostat says “Filter”. What does this mean and what do I have to do to make it go off?
  2. What does “Energy Usage” mean and how does it work?
  3. My thermostat says “Lo Batt” or “Replace”. What does this mean and what do I have to do to make it go off?
  4. My thermostat flashes “AUX HEAT”.
    What does this mean and what do I have to do to make it go off?
  5. My thermostat flashes “EMER HEAT”. What does this mean and how do I use it?
  6. My thermostat Flashes the “Time & Temperature” continuously. What does this mean and what do I have to do to make it stop?
  7. My thermostat flashes “Heat or Cool”. What does this mean and what do I have to do
    to make it go off?
  8. My thermostat displays “F° or C°”. What do I have to do to make it change?
  9. My thermostat displays “Mil. Time”. What do I have to do to make it change?
  10. What does “Auto-change” mean and what do I have to do to turn it off?
  11. What does “Dead band” do?
  12. What does the “light bulb button” do?
  13. What is the “DST” button used for?
  14. What is “Reset” for?
  15. What is “Hold” for?
  16. What is “Next” used for?
  17. What is “Override” for?
  18. What does “Calibration” mean?
  19. What is “Temperature Swing” for?
  20. What is “Smart Recovery” for?
  21. What are “PSP, PSD, and PSDH, Model Thermostats”?
  22. What are “CAG, DMH, HP, and TX, Model Thermostats”?
  23. What is a “Low Voltage” system?
  24. What is a “High Voltage” (LINE VOLTAGE) system?
  25. What does the Color Code, “Color of the Wires,” mean?
  26. What do the “Letter Designations” mean?
  27. What does “Freeze Protection” mean?
  28. What does a “PADLOCK” mean?
  29. Why is my thermostat “BEEPING” at odd hours?
  30. What does a “full display, all 8’s” mean?
  31. How do I use a Volt Meter to check Voltages on my thermostat?
  32. How do I jumper across the terminals to test the operation of my system?
  33. Why is my indoor fan running continuously?
  34. Why does the outdoor air conditioning unit run continuously?
  35. What is the “Gas/Electric” switch used for?

1. My thermostat says “Filter”. What does this mean and what do I have to do to make it go off? BACK TO TOP
When your thermostat displays “Filter”, this is simply a reminder that it is time to change your filter in your air conditioner/ furnace. It will not affect your thermostats performance at all. Refer to your operating manual to determine how to reset it.

2. What does “Energy Usage” mean and how does it work? BACK TO TOP
This is the accumulated daily Running Time of the furnace or air conditioning system, which can be displayed whenever the button is pushed or dial is turned into that mode. This will be shown as hours of run time. Refer to your operating manual to determine how to reset it.

3. My thermostat says “Lo Batt” or “Replace”. What does this mean and what do I have to do to make it go off? BACK TO TOP
When your thermostat displays “Lo Batt” or ”Replace”, this is simply a reminder that it is time to change your thermostats batteries. It WILL affect your thermostats performance if the batteries are not changed. Refer to your operating manual to determine how to replace your batteries.

4. My thermostat flashes “AUX HEAT”. What does this mean and what do I have to do to make it go off? BACK TO TOP
When your thermostat displays “Aux Heat”, this is simply a reminder that the second stage of heat is now ON. This occurs whenever the room temperature drops more than 2 degrees and activates the Second Stage of Heating (Aux Heat). This is a normal operation of your 2 Stage Heat Pump thermostat and it will not affect your thermostats performance at all.

5. My thermostat flashes “EMER HEAT”. What does this mean and how do I use it? BACK TO TOP
This is the Secondary side of the Heat Pump thermostat, which is a manual selection. The Secondary heat source will run ONLY to heat the home whenever selected because the outside temperature is below what the heat pump can normally handle usually 40?F or colder.

6. My thermostat Flashes the “Time & Temperature” continuously. What does this mean and what do I have to do to make it stop? BACK TO TOP
This is the Normal Operation of our programmable thermostats and can’t be changed.

7. My thermostat flashes “Heat or Cool”. What does this mean and what do I have to do to make it go off? BACK TO TOP
Most new model thermostats will show you that the heating or cooling is running by flashing “Heat” or “Cool” on the screen. When the thermostat reaches the cut off temperature the flashing will stop on the display and your system will now be off.

8. My thermostat displays “F° or C°”. What do I have to do to make it change? BACK TO TOP
Most of our thermostats will have a black jumper on the circuit board, which is used to change the display. Refer to your operating manuals Advanced Features to determine how to reset it.

9. My thermostat displays “Mil. Time”. What do I have to do to make it change? BACK TO TOP
Most of our thermostats will have a black jumper on the circuit board, which is used to change the display. Refer to your operating manuals Advanced Features to determine how to reset it.

10. What does “Auto-change” mean and what do I have to do to turn it off? BACK TO TOP
Auto-change is the thermostat’s ability to switch between heating and cooling at pre-set temperatures programmed by the customer. Refer to your operating manual to determine how to adjust this mode.

11. What does “Dead band” do? BACK TO TOP
When using Auto-changeover the “Deadband” is the adjustable temperature range between the maximum heat and minimum cooling 1-6° F. Refer to your operating manual to determine how to adjust this mode.

12. What does the “light bulb button” do? BACK TO TOP
When you depress this button the display will illuminate for a short period of time. Allowing viewing of the display in low light areas.

13. What is the “DST” button used for? BACK TO TOP
The “DST” button will change the time on your display from Day light Savings time to Standard Time with a push of this button. One press adds an hour a second press will subtract an hour from your present time. Refer to your operating manual to determine how to adjust this mode.

14. What is “Reset” for? BACK TO TOP
RESET cancels any display information and returns the thermostat to the default time / temperature and program. RESET is suggested if you want to "start over" for programming, or if the thermostat display is showing something unusual or if the system is operating erratically. Note: the thermostat requires reprogramming after pressing RESET.

 

15. What is “Hold” for? BACK TO TOP
When you depress this button the thermostat will “HOLD” constantly your manual temperature setting. This will be used whenever you wish to operate the thermostat manually or if you are leaving the temperature at one setting indefinitely (Vacation). Refer to your operating manual to determine how to adjust this mode.

16. What is “Next” used for? BACK TO TOP
The Next button will scroll the display when in the programming mode to the Next mode available. I.e. Time / Temperature

17. What is “Override” for? BACK TO TOP
When you adjust the set temperature “Override” will appear; this lets you know that the set point temperature has been changed. This will be a temporary temperature change until the thermostat reaches the next programmed temperature setting. Refer to your operating manual to determine how to adjust this mode.

18. What does “Calibration” mean? BACK TO TOP
This mode will give you the ability to change the display temperature if the thermostats do not agree within 1°F. You can adjust the calibration a maximum of plus or minus 5 degrees. Refer to your operating manual to determine how to adjust this mode.

19. What is “Temperature Swing” for? BACK TO TOP
The "Temperature Swing" setting changes the size of the temperature control band (or comfort range) with respect to the set point. The greater the swing setting, the larger the "size" of the temperature control range will be, and the lesser the swing setting, the smaller the "size" of the temperature control range will be.

20. What is “Smart Recovery” for? BACK TO TOP
This feature allows your system to come on early in an attempt to be at your set point temperature at the programmed time period. Refer to your operating manual to determine how to adjust this mode.

21. What are “PSP, PSD, and PSDH, Model Thermostats”? BACK TO TOP
These are Professional model thermostats sold only to heating and cooling technicians. These are low voltage controls and can be viewed at www.luxproproducts.com.

22. What are “CAG, DMH, HP, and TX, Model Thermostats”? BACK TO TOP
These are Do It Yourself (DYI) model thermostats sold through local hardware type stores. These are low voltage controls and can be viewed at www.luxproducts.com.

 

23. What is a “Low Voltage” system? BACK TO TOP
Any Cooling or Heating system, which does not exceed 30 volts maximum and 1.5 amps of current draw for it’s controls. Refer to your systems operating manual to determine how much voltage and current you are using.

24. What is a “High Voltage” (LINE VOLTAGE) system? BACK TO TOP
Any Cooling or Heating system, which does not exceed 120 to 240 volts maximum and 16 to 22 amps of current draw for it’s controls. Refer to your systems operating manual to determine how much voltage and current you are using.

25. What does the Color Code, “Color of the Wires,” mean? BACK TO TOP
Ignore the color of the wires since these may not comply with any standard wiring code. Use only the Letter Designations.

26. What do the “Letter Designations” mean? BACK TO TOP
The wires attached to the thermostat will have letters at the terminals. Each letter will have a certain function assigned to it. These are the code letters that will be needed for the installation of the thermostat. Refer to your operating manual (Terminal Definitions) to determine how to wire it.

27. What does “Freeze Protection” mean? BACK TO TOP
In some of our Professional Series Thermostats there will be a “Low Temperature Safety Switch” that prevents freeze up if the unit is left in the OFF position or if the batteries fail. Refer to your operating manual.

28. What does a “PADLOCK” mean? BACK TO TOP
This symbol will show that the thermostat is now in the Anti-Tampering Mode (Keyboard Lock). Most retail thermostats can be Locked and Unlocked by pressing NEXT, NEXT, NEXT, and then press HOLD and release. Refer to your operating manual under “Advanced Features” Program Lock. Some professional model thermostats have a Partial & a Full keyboard lockout. Refer to your operating manual to determine how to adjust this mode.

29. Why is my thermostat “BEEPING” at odd hours? BACK TO TOP
The thermostats Do Not have an independent beeping feature. Most likely this is due to a low battery in your smoke detector, a lost timer or a lost watch.

30. What does a “full display, all 8’s” mean? BACK TO TOP
When the batteries are first installed your display may continue to have all 8’s in your display, this is part of the thermostats test mode, simply press Reset on the front unit. If there has been a power surge or static discharge all 8’s may appear. Press the reset button on the front of the thermostat if this does not solve the problem, remove the front of the unit from the base and find the HW Reset on the back of the circuit board. Depress this button and the display should return to normal.

31. How do I use a Volt Meter to check Voltages on my thermostat? BACK TO TOP
On basic low voltage systems (gas, oil, or low voltage electric heat) when the thermostat is removed and the wires are exposed on the terminals, R/RH is the power. When a Voltage Meter is used, 24 to 30 volts is the normal amount of voltage that should be read between the R/RH terminal and any other terminal you are testing. To test Voltages, put leads across R/RH and “G” to test the fan, R/RH and “W” to test the heating, or between R/RH and “Y” to test the cooling, to test for 24-30 volts touch probes from R/RH to C if the “C” terminal is available. If you do not have a minimum of 24 Volts at each place, there is a problem.

For further assistance call Technical Service at 856-234-8803, leave your name and number and a technician will call you back.

32. How do I jumper across the terminals to test the operation of my system? BACK TO TOP
DO NOT put a jumper between R/RH and the Common “C” terminal.
On basic low voltage systems (gas, oil, or low voltage electric heat) when the thermostat is removed and the wires are exposed on the terminals, R/RH is the power. To test the fan, use a piece of wire and put a jumper across R/RH and “G”, you should hear the fan come on and feel air coming out of the vents. To test the heating, put a jumper across R/RH and “W”, you should hear the furnace come on and it will be a minute or more before you feel heat coming out of the vents. To test the cooling, put a jumper across R/RH and “Y”, you should hear the outside unit come on, have a someone outside to confirm that the outside unit is running.

For further assistance call Technical Service at 856-234-8803, leave your name and number and a technician will call you back.

33. Why is my indoor fan running continuously? BACK TO TOP

  1. If the fan switch is left in the “ON” position the indoor fan will run continuously until it is placed into the AUTO position.
  2. If this is an electronic thermostat please remove the front of the unit from the sub base mounted to the wall, if it's mechanical remove the RH wire from the sub base. If your system STILL RUNS when the thermostat or RH wire has been removed you have a System Problem, please call your local technician for repair assistance. If the fan SHUTS OFF the thermostat is the problem and you should first replace the batteries and reset the thermostat if it's electronic. If when you reinstall the unit the fan runs in the OFF & AUTO position the thermostat should be replaced.

For further assistance call Technical Service at 856-234-8803, leave your name and number and a technician will call you back.

34. Why does the outdoor air conditioning unit run continuously? BACK TO TOP
Your outside air conditioning unit should only run whenever the thermostat calls for the air conditioning unit to come on. If your outside unit is running continuously without the inside fan running TURN OFF the thermostat IMMEDIATELY! If this is a New Installation check the wiring as per diagrams provided.

  1. If the unit does shut off remove the front of the thermostat from the sub base then replace the batteries and reset the thermostat. Replace the front of the thermostat to the sub base and see if the outside fan comes on when the power is reapplied. If outside fan runs in the OFF & AUTO position the thermostat should be replaced.
  2. If the unit does not shut down turn off the power to the heating/cooling system, remove the front of the thermostat from the sub base then turn on the power to the system. If the outside unit comes back on when there is no thermostat attached you have a stuck contactor in the outside unit and a technician should be called for repairs.

For further assistance call Technical Service at 856-234-8803, leave your name and number and a technician will call you back.

35. What is the “Gas/Electric” switch used for? BACK TO TOP
Some Electric Heating systems must activate the indoor fan when there is a call for heating. The switch or jumper is in the gas position from the factory, which allows the furnace to activate the fan in heating. Refer to your systems operating manual to determine how to adjust this feature.