Question about Heating & Cooling
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Posted on Jan 02, 2017
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
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
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
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