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Honeywell thermostat error 40 - Heating & Cooling

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I have an A. O. Smith Model FPSH 40-261 hot water heater. It won't heat water. there is a green light on the control flashing. What does it mean?


AO Smith uses the Honeywell ICON gas valve with green indicator light.
Some models use White Rodgers Intellivent with a row of indicator lights.

The gas control blinks the error code:
Open following links to identify gas control thermostat and read possible error codes:
http://waterheatertimer.org/pdf/Honeywell-Gas-Valve-LED-Codes-2000.pdf
http://waterheatertimer.org/BW.html#Temp
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#intelli

Jul 18, 2011 | Water Heaters

1 Answer

My Honeywell Thermostat has a "-AC" error. Nothing is running (fan, cool, or heat). What does this likely mean?


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Aug 31, 2010 | Honeywell Electronic Programmable...

1 Answer

EEE display code error on CT3600 Honeywell


I am a honeywell dealer and this stat is obsolete and no longer supported. I am not able to pull any info on this. It might be time for a new one.

Oct 01, 2009 | Honeywell Electronic Programmable...

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

1 Answer

EEE error message


I just talked to Honeywell support - they claim that an eee error means there has been a "unique error" and that the unit will need to be replaced - cannot be fixed. They were pretty good about giving a suggestion for a new thermostat and wiring directions if you want to DIY. Otherwise, call a pro.

Oct 29, 2007 | Honeywell CT3600 7 Day Electronic...

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