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My thermostat is blank and the batteries are not the problem. How do I check and identify the cause of the limit trips?

My furnace and a/c both turn on but there is no display on the thermostat. I have no meter to check that there is 24 volts. What is causing this? I read it may be a safety thing and that there could...

Last winter I installed a programmable thermostat and everything was working fine. When summer arrived I switched it over to cooling and it was working fine all summer. I just switced the cooling off...