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

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How to reset honeywell chromotherm III - Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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SOURCE: My furnace has stopped working. the thermostat

Try to find a reset button or just change out the thermostat. I'm guessing you don't have the manual. Thats a pretty old model, I think you have to set the time and day before you can use the thermostat.

Posted on Dec 30, 2009

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My furnace has stopped working. the thermostat (Honeywell Chromotherm III) displays HOLD - AC. What does this mean? I replaced the batteries but nothing has changed.


Try to find a reset button or just change out the thermostat. I'm guessing you don't have the manual. Thats a pretty old model, I think you have to set the time and day before you can use the thermostat.

Dec 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell chromotherm iii says and beeps low battery, even though i just replaced the batteries


check that the springs on each end of the batteries are keeping them together tightly (connected) if thats not it the only other option is to replace the stat

Oct 18, 2009 | Heating & Cooling

1 Answer

Inaccurate current room temperature reading


It is not adjustable, sounds like the LED is going bad. Tstat has battery back up for power outages. If you slide the fan switch from auto to on does the blower motor start? If not control problem with unit.

Jan 22, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

No A/C Msg. On Control Unit


Apparently the tenant turned off the unit because he was too cool. I explained that basements are normally cool anyhow but he could close some of the vents.

Aug 17, 2008 | Heating & Cooling

1 Answer

We have a Honeywell Chromotherm III thermostat and it has an error message "-AC". No fan, AC, heat, etc. Any ideas?


I almost think you have no power source to the thermostat as if the power is off to the air handler unit (furnace), or the 24 volt transformer is bad. Could well be that the error codes are being powered by the battery.

Jul 24, 2008 | Honeywell Heating & Cooling

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