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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)

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

jumptrout51
  • 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

meBNme
  • 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
Red
white
yellow
green
blue

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.
http://www.lennox.com/pdfs/manuals/Lennox_SignatureStat_Manual.pdf
Hope this helped. Goodluck Elect_Comp

Posted on Aug 29, 2011

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