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

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Honeywell Chronotherm III puts heat up contrary to programming

There seems to be a phantom setting in my chronotherm III thermostat. It puts the heat up at 4:40 am to 66 degrees, when the wake mode starts at 5:40 am at 66 degrees. The program is still in sleep mode at the time and sleep mode is at 62 degrees. I have disconnected, taken out the batteries to restart and it still does it. Any ideas ?

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  • 96 Answers

Sounds like t-stat is going bad

Posted on Jan 06, 2009

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Honeywell Chronotherm III Thermostat shows time of day-AC. No heat in the 2 zones with this message.


Hello,Message AC means that there is no 24volt power to the thermostat from the unit/s it controls.Please check all switches & curcit breakers to the unit/s as there is no low voltage power to the thremostat from the transformer in the unit/s.Maybe got turned off by mistake.

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I have a very old manual Chronotherm thermostat.


No. The clock is just the set back timer. Pull the battery and use the stat manually.

Jan 26, 2010 | Honeywell Electronic Programmable...

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My honeywell chronotherm III says -AC any ideas


The problem is your 24v power source. I am unsure as to why you put "other than power source or batteries". If you did indeed check that your thermostat is receiving 24v, then I would say that you have a bad thermostat. Hope this helps

Jan 22, 2010 | Heaters

1 Answer

Honeywell T882 Chronotherm Clock Thermostat needs replacement


The two wires from the transformer are to run the clock in the old thermostat. If you connect the two other wires to any heating thermostat, it will work. Don't forget to disconnect the transformer wires. Hope this helps

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There are no batteries on an 8600-8601-8602 series

Feb 17, 2008 | Heaters

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