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My honeywell thermostat says hold -AC on it and i can't figure out hgow to get the heat to come on now.

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Your tstat is not getting low voltage power from the transformer. check at the furnace or airhandler for high voltage and check the low voltage fuse

Posted on Nov 22, 2008

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How do I set my thermostat so that it doesn't keep going off and leaving me with no hot water .I have a Honeywell digital thermostat.


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Mar 19, 2011 | Honeywell Air Conditioners

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Oct 05, 2010 | Air Conditioners

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 Air Conditioners

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My Honeywell thermostat T874R is showing the EM heat indicator light when I turned the AC on for the first time this season--Why? House is warm but not humid.


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May 27, 2008 | Honeywell Air Conditioners

1 Answer

How do I change the temperature range on a Honeywell TH8110u1003 thermostat. The range now won't let me go below 77 in AC mode.


Try adjusting the heat range up. Set it a 77 then try the cool.
I believe the Honeywells have a max range between cool and heat.
also sometimes there is a lock out code on them you'll need the book.
Good luck

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