My Honeywell Heating Thermostat kept flashing Battery Low and would not turn on the system. View Full Version : Honeywell Thermostat RTH230B Blinking Battery Icon. We changed batteries in our thermostat when the blinking battery icon came on but the icon never stopped blinking and we don't have any heat. Nov 11, 2008, 05:46 PM. We purchased an new thermostat (same model) and no change. The fan comes on but nothing else. Replace batt air conditioner if central air thermostat not working. Related Articles. We changed batteries in our thermostat when the blinking battery icon came on but the icon never stopped blinking and we don't have any heat. How to obtain a user guide for the Honeywell Home CM927 programmable thermostat? You have an indoor unit, outdoor unit, and a thermostat. How to change battery in Honeywell thermostat cool on but not working ac. Honeywell 6000 series (TH6110D/ TH6220D/ TH6320U) âREPLACE BATTERYâ flashes. Room Thermostat â A simple room thermostat that allows the setting of temperature for that room which is connected to the main system to control heating and cooling. once temp gets to 78 which I think is the default the AC comes on Insert 2 fresh AA batteries and then reinstall battery holder. What does the battery icon mean on the display of the CM927 thermostat? Even after i cleaned the contats thor ⦠read more Once removed, turn the thermostat over and insert 2 fresh AA batteries, and then reinstall the thermostat on the wallplate. We purchased an new thermostat (same model) and no change. LeslieBN. Troubleshooting a faulty Honeywell thermostat. I replaced the AAA batteries 3X's and still gives me the same message! You did not specify which model, many operate differently but it is most likely in recovery mode going into the return time period. The fan comes on but nothing else. Either the AC system is kickstarting which can take up to 5 minutes and is perfectly normal, or thereâs a bigger problem which you need to troubleshoot. File 2. The thermostat shows a flashing symbol on the LCD screen when the batteries are exhausted and need replacing. Great question. If âCool Onâ is flashing on your Honeywell Thermostat, it can mean one of two things. Make sure the indoor unit, outdoor unit, and thermostat are all powered up, then wait five minutes. If you see your Honeywell thermostat blinking, thatâs a legitimate cause for concern â but not as much as youâd think. ive changed battery and its still blinking. Honeywell Chronotherm III thermostat says repl battery. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? File 1. Same blinking light. I think its thermostat. If it still isnât working then we need more info. Honeywell Thermostat RTH230B Blinking Battery Icon. 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