Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I REPLACED BATTERIES ON MODEL # TH8320U1008 THERMOSTAT, AND AM WONDERING IF I NEED TO SOMEHOW RESET SOMETHING TO GET THE A/C UNIT TO TURN ON. I GET A CLICK SOUND AS IF THE AC WILL TURN ON, BUT IT DOESN'T. HELP!

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Go to instuctions and find procedure to go to Advanced Settings. I think it is #170 to identfy the system you have if heat pump go to 190 and set to A/C Mode 0

Posted on Jul 04, 2009

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My Honeywell Themostat is no longer controlling the systems after a battery change, but otherwise looks fine. Help!


The replacement batteries could be defective or installed incorrectly. Also, if the thermostat has to be removed from its mounting base for installation of replacement batteries, it may have been reinstalled incorrectly.

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Take a multimeter and check your rh and w terminals. With the face off, you should get 24 volts. If you do not get 24 volts, turn the power off, and check the continuity, you should get ol (open load). Now if you do not have 24 volts, and the meter reads ol, there is a problem in the wiring to the thermostat. My only concern is the green light blinking slowly, but if that is normal on your unit, I will let it be. Hope this helps

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