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TX9000, TX1500, TX1000 and TX500 Operation Guidance

 
  Listed below are some general operation guidance instructions for your Lux TX9000, TX1500, TX500 and TX500. For further assistance please refer to the instructions that came with your thermostat. Some of the original instructions sheets can be viewed in PDF format at our Technical Support Page.

 

 

   
 

Problems and Resolutions

 
Problem
Resolution
Heats or cools more than 3 degrees past the set temperature and/or will not cut off
  1. Replace the batteries with unused, fresh, good quality alkaline batteries.
  2. Verify the wiring to be proper according to the wiring schematic for your system.
  3. Decrease the swing deferential to a lower number. Refer to the programming section of your control model.
  4. Contact our Technical Assistance Line if not resolved.
No heat or cooling when calling for heat or cooling, or short cycling. That is running a few seconds, cutting off, then coming back on
  1. Replace the batteries. Press reset with a pencil point. Reprogram.
  2. Confirm proper wiring installation.
  3. The contacts may need to be squeezed toward each other SLIGHTLY. The contacts are two brass prongs located above each letter designation, above the wire terminals on the subbase.
  4. Using a pencil eraser, clean off the single contact pens on the circuit board.
  5. If you are technically inclined, you may jump the terminals out to detect a malfunction in your system. Follow the steps below for LOW VOLTAGE ONLY. To test heating, take the "W" and "RH" wires off the thermostat. With the power ON at the fuse box, touch the wires together for a couple of minutes and the heater should come on and stay on. For a single stage heat pump, you must join all four wires together. If the heat pump does not come on, or if the system short cycles, the problem is not in the thermostat. Note: TX500 is NOT compatible with heat pumps. To test cooling, remove the G, Y and RC wires. Hold these 3 wires together for several minutes to observe operation. The system should come on and stay on. If the cooling fails to come on, or comes on and short cycles, the problem is in the system, not the thermostat. (If you do not have RC, use the RH wire.)
Heating and cooling compressor okay but no fan function
  1. If you have a 2-wire system,heating only, the thermostat does not control your fan. The problem would be in the system.
  2. If you have the fan wire properly installed at the "G" terminal, squeeze the contacts (2 brass prongs above the "G" letter) toward each other SLIGHTLY.
  3. If persists, contact our service line to determine the origin of the problem.
Fan locked, will not cut off
  1. Operate the Fan switch in the AUTO position. The ON position calls for the fan to run continually.
  2. Remove the "G" wire. If fan continues, the problem is in the system, not the thermostat.
You have a proper display, but nothing is operating, no fan, no heat, no cooling when calling for each function
  1. Check the power at the fuse or breaker box to insure power coming to the thermostat.
  2. If power on but no power coming to the thermostat, contact our service line for assistance.
No fan function in heat mode
  1. Gas and oil heating systems control the fan/air handler. If the fan is not operating, it is a heating system problem, not a thermostat problem.
  2. The thermostat does control the operation of the fan with electric heating systems. Verify the wiring to insure correct hook up. Make sure the jumper wire is connecting RH to RC. (Note: see different wiring for a Heat Pump installation)
  3. Squeeze the contact pins above the G and RH terminals on the subbase slightly toward each other to insure a better contact.
  4. Move the switch on the circuit board to ELECTRIC for electric heat.
  5. Contact our service line.
   

 


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