Question about Heating & Cooling

Open Question

Hello I have a lennox signature stat thermostat, apparently it is just "off" no display, nothing. and I cant find a battery. any ideas? (all circuit breakers are on)

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 3361 Answers

SOURCE: i have a lennox s ignaturestat thermostat

You have to open the airhandler control panel and locate the control board. There is a 3 or 5 amp fuse on the board that may be blown. If the fuse is good verify high voltage into the transformer and low voltage of 24 volts out of the transformer. to the thermostat. Also check the thermostat wires at the airhandler. One or more may have come loose.
Your most likely problem is going to be the fuse or a bad transformer.

Posted on Aug 29, 2011

  • 334 Answers

SOURCE: Replacing Lennox Thermostat with Lux TX9000TS electronic t-stat

Unless you have a 2 stage heat system, all you wire up is W1
X is typically only used for humidifiers, dehumidifiers, air cleaners adn other such accesories. If you have none of these, X is unused.

It is typical to find that the original installer wired black or brown to X at the T-stat and left it unhooked at the unit. In such case, just leave X unused.

If your wires are

And if your system is a typical furnace with airconditioner then wire it liek this,

Red to Rc
Yellow to Y
green to G
White to W1
Blue to C (common)

Your installers manual will let you know if you shouild leave the jumper between the Rc and Rh terminals.

O terminal is only used for heat pumps and getas the orange wire.

If your T-stast has batteries and does not require an external power source, then you do not have to have the blue wire to C terminal.

If for some odd reason the maqnual does not inform you obout the jumper to RC/RH Try it firt without the jumper. Run it through all cycles. If all modes do not operate, install the jumper.

Posted on Jan 24, 2009

  • 1894 Answers

SOURCE: My thermostat has a blank display. I reset the

i thnk there must be some problem with the thermostat itself. check it out. its has got some firmware problem.

Posted on Jul 27, 2009

  • 141 Answers

SOURCE: Carrier programmable thermostat

if it takes batterys pop some in and see if not it gets the power from the indoor unit

Posted on Apr 06, 2010

  • 586 Answers

SOURCE: i have a lennox s ignaturestat thermostat

Hello there,
There are several reasons for the lennox signature stat thermostat no to turn on any display. It could be caused by a bad power board or something else on the lennox. So i will advice you simply run a check through the manual for troubleshooting precesses if that would help.
Here is the link to the manual.
Hope this helped. Goodluck Elect_Comp

Posted on Aug 29, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hello, I bought a Dial 7617 thermostat and am trying to install. The thermostat has 115 VAC to the black power and white common but shows nothing on the LED display.

Have you run a green ground wire from the cooler to the T/stat? Are the wires from the T/stat connected to the motor and pump on the cooler? If all is connected and no readout then the T/stat is bad.

Nov 13, 2016 | Heating & Cooling

2 Answers

System is programmed OFF and Fan is programmed to Auto, but fan will not turn off

could be several problems, relay that controls fan must be stuck in closed position, stat not sending correct signal to fan.

Mar 27, 2015 | Lennox Elite X4146 Touchscreen Thermostat...

1 Answer

Does a y2081 lennox thermostat have a batteryin it

Yes it has 3 AAA batteries.
Pull it straight off the wall. Look at the back of the thermostat and replace the three batteries.

Link to manual..

Sep 10, 2014 | Lennox Y2081 ComfortSense 7000 Thermostat...

2 Answers

Furnace computer won't let furnace light

What is the model number? I have an SLP98 (installed on 11/29/2011).... and if I take the cover off the front of the furnace the panel that has the fancy "Lennox" badge on it) you will see two clear round windows about the size of a half dollar (one high on the furnace box and one lower on the blower box.) If you look downward into the window on the blower box you can see a red LED display that will sometimes flash error codes like E228 (one character at a time). If your model has something like this, let me know. I've done some DIY fixes recently out of necessity....and their easy.....and several technicians confessed they didn't know much, if anything, about the newer high effieciency Lennox gas furnaces.

Mar 01, 2013 | Lennox Heating & Cooling

1 Answer

Please assit with White Rogers Thermostat Manual 1FS97-374. Why Check STAT comes? Thank you, Kumar

The display will indicate CHECK STAT if one of the following occurs.
• One of the buttons is stuck down or in. Check buttons, make sure nothing is pushing them in.
• The thermostat sensor is not functioning. If using a remote sensor, check connections, wiring and power.
• The humidity sensor is not functioning.
After checking the above, press PROGRAM RUN to reset the display. If this does not clear the display, disconnect power and remove the batteries for five minutes.If these checks fail to solve the problem, the thermostat should be replaced.

Jul 27, 2010 | White Rodgers White-Rodgers 1F85RF-275...

1 Answer

I replaced a Lennox DSL-450LX heat pump thermostat with a Honeywell RTH3100C. Everything works except the gas does not ignite when set to emergency heat. The Lennox was wired as follows: W = white wire Y1...

Hi, If indeed you do have a heat pump, there wouldn't be any gas involved as a heat pump runs on freon with a reversing valve and heat strips for aux and emerg. heat. For gas electric operation thermostat terminals are rc to rh with factory jumper. Red wire to either.W to W for Heat, Y to Y for cooling G to G for Fan. If you have a blue, you wont need it unless this is a commercial stat useing a common for the Led lights on the stat. The unit will get its 24volts through R terminal in combination with y,w,and,g. Cant be a heat-pump if you have a gas furnace.Wrong t-stat. You need a gas /elect stat. And on a 24volt programmable t-stat, the batterys are used for the program only.If the batterys die, than you will loose the program on most residential stats. On commercial stats with the common in play, when batters die the stat defaults back to the factory settings.If you had a Lennox heat-pump stat on a gas/elect unit, you need to change it. Someone was using what they had on hand. Let me know if this has helped you.I will be here if you need me. Sincerely,

Nov 17, 2009 | Air Purifiers

1 Answer

Honeywell digital thermostat stopped working

Sounds to me like you have a low voltage short. If the stat had no display until you installed the battery means there was no voltage for the stat to work. Putting the battery in proves the stat works, no motors turning on probably leads to a blown low voltage fuse generally a blade fuse on circuit board in indoor unit. Good Luck

Jun 11, 2009 | Honeywell Programmable Thermostat Heater

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

1,575 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3250 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides