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The screen on my digital thermostat went blank.

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That is usually an indication that the batteries have failed (inside). It is also helpful to turn off and then on the power to the furnace (to reset). ...most states require a switch on the furnace, or use the fuse.

Posted on Apr 24, 2008

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If your thermostat uses batteries, they may have expired during the summer. If you install new batteries, the thermostat display should come on

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mcdevito75 here Sounds like a faulty thermosat, un --plug a.c unit for a few mintes maybe it"ll recycle, plug back in wall and try again, if not see your local a/c repair shop.

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This means the furnace is sending power to the thermostat. This can b anything from no 120v to furnace, blown low voltage fuse on furnace circuit board, condensate pump too full, transformer bad etc.

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Check the battery in the thermostat it is dead!! Should be 2 AA batterys!

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Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

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