If you have this type of system your thermostat will not work;
This thermostat is only for this type of HVAC systems;
Two wires control a heat only system.
Two wires control a cool only system.
Three wires for forced air heat only system, where the previous thermostat
did not have a clock or timer.
Three wires for a heat only, forced
water system that did NOT have a
clock or timer.
Three wires control a heat only, forced water system that DID have a clock or timer.
Four wires control a heat only system,
and two of the wires operate clock or timer. The other two wires operate the heater.
Two wires control heating AND cooling.
Three wires control heating and cooling. One wire operates heat, one operates cooling and the third provides 24 VAC.
Three wires control a cooling only system. One wire operates the compressor, one operates the fan and the third provides
24 VAC.
Four wires control a heating and cooling, electric, gas or oil, forced air system that
is NOT a heat pump.
Four wires control a Single Stage Heat Pump. They were labeled: G, Y, R or
RH or RC, With either B or was used.
More than 4 wires are connected to the
old thermostat
No fan function in heat mode Move the switch or jumper on the circuit board to its ELECTRIC position for electric heat.
Fan On continuously Move Fan switch from ON to Auto
Remove the "G" wire. If fan continues to run, then either the system is miswired, or the problem is in the system, not the thermostat.
Indicates incorrect room temperature Refer to thermostat manual to verify that your set temperature is what you expect it to be. The set temperature is always visible with "SET" below.
Heats or cools more than 5 degrees
past its displayed set temperature Refer to thermostat manual to verify that your set temperature is what you expect it to be. The set temperature is always visible with "SET" below.
Remove thermostat body from the wall, leave the backplate in place. Verify that Heating and cooling switch off within a few minutes.
Replace the units batteries with fresh Duracell ® or Energizer® alkaline batteries.
Set unit to heat mode. Adjust set temperature to at least 5 degrees below room temperature. Then adjust set temperature upward one degree at a time. Listen carefully for a soft click from the thermostat. This click should be heard near room temperature.
Refer to your units manual to decrease the units swing setting to a narrower setting.
Verify that your units placement and mounting are optimum per the installation section of it's manual.
Refer to wiring to verify that it is according to the wiring diagram for your system.
No heat or cooling when expected. Note that in Cool Mode the thermostat may not activate a cooling stage until its compressor protection time has elapsed this may be a long as 5 minutes.
Refer to thermostat manual to verify that your set temperature is what you expect it to be. The set temperature is always visible with "SET" below.
Replace the batteries with fresh Duracell® or Energizer® alkaline batteries. Press reset with small Phillips screw driver. It may be necessary to reconfigure some settings after a reset.
Set unit to heat mode. Adjust set temperature to at least 5 degrees below room temperature. Then adjust set temperature upward one degree at a time. Listen carefully for a soft click from the thermostat. This click should be heard near room temperature. Adjust set temperature down one degree at a time. Again listen carefully for a soft click from the thermostat near room temperature.
The brass contacts in your thermostat may need to be cleaned and/or tightened. Each contact is comprised of a pin protruding from the rear of the thermostats circuit board, and two V shaped two contacts on it's wall plate. These contacts are located above each screw terminal. Insert a small regular screw driver at one side of a "V" contact. Turn the screw driver to slightly bend the top of each "V" contact toward it's mate.
Refer to wiring to verify that it is according to the wiring diagram applicable to 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. If your
Fan Test FAN TEST: If your system has a fan, test it first.
If the system is Heat only, or if there is a jumper between the "RH" and "RC" terminal of your thermostat, then with the power ON at the fuse box, touch the "G:" wire to the "RH" terminal. The fan should come on immediately and stay on. The rush of air is usually easily heard.
If the system is Cool only, or if the system is Heat and Cool and there are separate wires to "RH" and "RC", and there is no jumper between them: then with the power ON at the fuse box, touch the "G:" wire to the "RC" terminal. The fan should come on immediately and stay on.
If the fan does not come on it is an indication that there is a problem with your system. Check any breaker o fuses that fed the 24VAC transformer that powers your system.
If persists, contact qualified service personnel for aid in determining the fault.
Heat Test To test gas or oil heating systems, take the "W" wire off its terminal. With the power ON at the fuse box, touch the "W:" wire to the "RH" terminal for a couple of minutes and the heater should come on and stay on until the wire is removed.
Cooling Test To test cooling, remove the "G" and "Y" wires. Connect them together with the "RC" 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 off, the problem is in the system.
Heat Pump Test To test a heat pump system with an "O" wire, three wires must be connected together with the power terminal. The power terminal is "R". "RH" and "RC" with a jumper between them my also be consider to be a single "R" terminal. With the power ON at the fuse box, connect the "O" and "Y" or "Y1" and "G" wires to the "R" terminal for a couple of minutes and the unit should provide cool air. Wait at least 5 minutes and repeat this test without the "O" wire. The unit should provide Heat.
To test a heat pump system with a "B" wire, three wires must be connected together with the power terminal. The power terminal is "R". "RH" and "RC" with a jumper between them my also be consider to be a single "R" terminal. With the power ON at the fuse box, connect the "B" and "Y" or "Y1" and "G" wires to the "R" terminal for a couple of minutes and the unit should provide warm air. Wait at least 5 minutes and repeat this test without the "B" wire. The unit should provide cool air.
Contact your HVAC service company or our Technical Assistance
Line if not resolved.
The old lennox wiring was this:
O-Orange
G-Green
Y1-Yellow
R-Red
C-Blue
W1-White
I have a lux DMH110 I want to install. I hooked up the Thermostat. Everything came on but the heater came on in COOL mode and just the fan came on in HEAT mode. The tech last night told me the orange wire wasn't going to be used. The unit outside is a Goodman and the Model number is PHK036-1. I need to know how to hook the wires up to the Lux DMH110 or i need to know what type of thermostat I need and how to hook that one up. Thanks.
All this is chinese to me. I just need to know how to get this working. I already paid $20 that didn't solve my problem. Its about to get really hot today and I need my AC. Please help
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I looked at your last post.
The thermostat you have purchased is for a 1 heat/1 cool conventional system. By the looks of the wires you have listed, you actually have a heat pump, so therefore, the thermostat you have purchased is not compatible with your system...and will not work properly. But there is a way to make it work until you can purchase the correct stat.
To get yourself cooling temporarily, hook up the Red and Orange wires to the R terminal. If there are two R terminals (RH and RC), leave the jumper installed between the two. The red wire is your power wire and the orange wire is for the reversing valve(for cooling). By wiring them together, you are forcing the heat pump to run in cooling all the time.
Hook up the Yellow wire to the Y terminal. This wire is for your outdoor unit (compressor).
Hook up the Green wire to the G terminal. This wire is for your indoor fan.
Hook up the Blue wire to the C terminal. This is the common wire for the 24V from the thermostat.
You can choose to hook up the White wire to W terminal if you choose. This wire is for your heat strips. With the thermstat being incorrect, the heat pump will NOT run in heat.....because the thermostat is not for a heat pump.
As always, turn off all breakers before attempting this. If you ground out the wrong wires, you could blow a fuse or transformer.
That wiring I just showed you should get the system running for you today. But you do need to get a thermostat that is compatible with 2 heat/ 1 cool Heat Pump systems.
I recommend the Honeywell line-up of stats. They are easy to use and are a very reliable thermostat. They can be purchase at any major hardware store or online at your favorite shopping site.
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The old lennox wiring was this:
O-Orange
G-Green
Y1-Yellow
R-Red
C-Blue
W1-White
I have a lux DMH110 I want to install. I hooked up the Thermostat. Everything came on but the heater came on in COOL mode and just the fan came on in HEAT mode. The tech last night told me the orange wire wasn't going to be used. The unit outside is a Goodman and the Model number is PHK036-1. I need to know how to hook the wires up to the Lux DMH110 or i need to know what type of thermostat I need and how to hook that one up. Thanks.Jun 27, 2010 - All this is chinese to me. I just need to know how to get this working. I already paid $20 that didn't solve my problem. Its about to get really hot today and I need my AC. Please help
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