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Honeywell thermostat the readout (LCD) is blank and A/C is not blowing.

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You have lost power to the A/C system. Check that the Emergency switch has not been turned to the off position by mistake. If it is in the on position you will need to inspect the indoor unit to see if an access panel may have opened slightly causing the door safety switch to open and turn power off to the unit. This is typical found where you replace the air filter. If neither of these help, check the circuit breaker box for a tripped breaker. Cycle the breaker for the A/C system and inspect the thermostat to see if it is displaying any information. If still blank, you may have a bad transformer or something else wrong and a technician will have to diagnose. Hope this is helpful.

Posted on Sep 12, 2007

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I have A LCD Honeywell thermostat that has a display that is blank. also it is not sending anything to my furnace. there for my main level in my house is very cold. I have the same one up stairs and it is...
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I have the same problem.
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Jun 09, 2009 • Honeywell Programmable Thermostat Heater
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Hi Linda,

There are a few things that cause this:

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  3. Have someone check the house when it is extremely cold or hire a service to monitor. Your alarm company can usually add temperature sensors to your home, it will add a little safety net for you.
Hope this was helpful, please rate my answer.
Thanks,
Paul
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