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Hello, first off make sure the batteries are installed in the correct positions.... we all mess that up from time to time. Clean the battery terminals with an alcohol swab while you have the batteries out
If the system still does not work. reverse them all, that is deliberately put all the batteries in backwards, wait 5 minutes then reinstall them in their correct positions.
If that fails, tell me a lot about your technical skill sets and if you have a multi meter or not so that I can coach you most effectively.
This could easily be a reset issue if it was over 100F outside when the unit failed, tell me about that please.
We can go from there
Hello again, if the breaker is *tripped*, 'flipping' it won't work to reset it. You have to turn it off, then force it hard toward the OFF position, *that will reset the breaker. Then turn it back on.
Tell me about how old the unit is, and if you have ever cleaned its outside condenser coil or not....a dirty coil will cause the unit to trip its high pressure safety cut out switch on a 100F day.
Depending on the make and model of the outside unit that reset can be reached through a 1 inch hole punched in the sheet metal, or you have to access the electrical controls area inside the unit itself.
Tell me a lot about your technical skill sets so that I can coach you on how to check out the thermostat. (its done by accessing the wires that come from the thermostat and end up inside the blower compartment of the furnace... if you can send me a photo of that terminal strip I can coach you on how to check the thermostat out)
To attach a photo use the paper clip icon at the right end of the tool bar, or the attach files link to the left of your send button.
Hello again, your friend is not far off the mark, corrosion does a lot of damage.
Getting the right thermostat for your type of system that does not require 40 pages of fine print programming however is not always easy.
Look for a thermostat with one page of installation instructions, costing $50 or less. if yours does not have a C terminal the one you buy must be entirely battery operated. If yours has a C terminal it can be powered from the furnace and the batteries are only there for back up.
We can go from here without a time limit.
I need the full model numbers of both thermostats to tell if they are compatible..
and.. if you can pry the existing thermostat off of its wall mounted sub base and tell me which color wires go which color terminals, I can help you.
Hello, thanks for the attempt but the photo of the old thermostat arrived too blurry to read, and there was no picture of the *wire* terminal connections on the existing thermostat sub base... at this rate, with me coaching you this will take hours.
I will opt out so that other experts here can take a shot at helping you.. if everyone else declines, I will help you for up to 5 straight hours of coaching but only if you provide a positive rating..... lacking that I loose my shirt on an involved deal like this.