Question about Honeywell Power Humidifier: Furnace Humidifier/ Humidifier

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Honeywll Chronotherm 3 reading Hold AC

Thermostat is stuck on Hold AC reading and will allow me to change program info, desired temps, etc. but neither the heat or air will turn on

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  • John O
    John O Nov 30, 2013

    The owner's manual indicates that some models will display the - AC message when operating on the backup batteries. I would check to see that there is 24-volt power to the thermostat.

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  • 27 Answers

The power to your furnace has been turn off. check the switch at the top of the stairs.

Posted on Nov 26, 2008

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Thanks jjplumb, right on the nose!

Posted on May 18, 2009

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I HAVE A "honeywell chronotherm


Open the front panel, opens from the top, hinge at the bottom. You will see 2 Philips screws at the bottom at the "hinge" part. Unscrew them. Pull the thermostat from the wall by pulling off the top part. You need 3 AA batteries. You have 20-30 sec to change the battery without re-setting the program, so be prepared and have batteries handy. Make sure your + and - are in correct order- have a flashlight handy to see well. If you done it in time- you all set, if you are a bit late prepare to re-program according to your liking. You can re-program it while it is away from the wall, sitting in your chair! Instructions are on the inside panel, which you open All the best!

Nov 23, 2010 | Honeywell Power Humidifier: Furnace...

1 Answer

A/C won't come on, replaced batteries, display reads -AC Honeywell chronotherm III Thanks for any advice !!!


HONEYWELL WEBSITE:
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 07, 2010 | Honeywell Power Humidifier: Furnace...

1 Answer

I have a Honeywell Chronotherm III Thermostat and in instead of showing the temparature in the display it shows -AC. I've replaced the batteries, and tryied adjusting Temp up and down for cooling and...


It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.

Dec 23, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

No matter what setting is put on furnace humidifier, moisture forms on windows.House is only 6 years old and does have a lot of windows.


Hello WPwilkers, Well there's good news and good news!

First off, you should probably use the lowest possible setting as your house being so new, is likely pretty "air-tight" and as such, doesn't have a lot of air infiltration (gaps and drafts) hence the reason you're seeing moisture on the windows.

Now, I would also use a hygrometer, just like your parents likely had hanging on a wall somewhere in their house. It will give you a better idea of the moistur (humidity) around the house. My guess is that you're already at the 60%+ level of humidity.

I suggest that you turn "OFF" the furnace mounted humidifier, until you no longer see moisture on the windows. That will allow the house to adjust and get back to normal humidity levels.

Then you can start by setting the humidifier on the lowest possible setting and keep an eye on the moisture levels in your coldest room of the house, as that is where you'll first notice the excessive moisture on the windows (just the way it works - cold rooms get condensation on the cooler windows first).

If you don't have the humistat (the control for the furnance mounted humidifer) mounted next to your heating and cooling system thermostat, you should do that - it will make it easier to adjust and also will provide a more accurate reading for the humifier to operate properly.

Some Thermostats have the ability to add a humidifier on it for integrated controlling of the furnace humidifer. Check your Thermostat and Furnance owner's manual for details.

I used to have the same problem and found that by moving the humidifer control from the utility room (mine was in the basement of my house) to the living space, it made a big difference. Since most people's homes have unfinished basements and that's where the HVAC system is located, it doesn't get the same humidty readings as an occupied living space.

The other reason that you tend to get moisture (condensation) forming on windows is that the Percentage of humiditfication is set manually with the humidifier control, and yet, the outside (and inside) air temperature vary and the difference between them can cause the humidity levels to go from very dry to very moist, in a day or two.

I tend to wait until I notice that the air inside the house is getting dry and then turn on my humidifier, once the cold winter days have taken hold. In summary, nothing wrong with your unit, just mother nature and a well built (most air-tight) home are giving you higher levels of condensation than most older homes. Gradual adjustments, once you turn the humidifier off for awhile, should get you the desired results.

I hope you find this Very Helpful and best regards!

Dec 17, 2009 | Honeywell HE365 Humidifier

2 Answers

Chronotherm III...Replace Battery notification blinking...replaced twice with the appropriate batteries, turned the correct way. Cleaned off the battery terminals and still have replace battery...


Thermostat problem; Honeywell chronotherm lll ' Low Batt. indicator Keeps blinking after Batteries replace. I chk'd batt. with elect. volt ntr. Was told to pull batt. and change ends with them , letthem stay reversed for 5-10 sec. then put them back in right order,and replace thermostat. No success!
Anyone have any answers

Nov 12, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

I HAVE A HONEYWELL CHRONOTHERM 3, THE DISPLAY SHOWS THE TIME & -AC. I THINK THE UNIT IS FIRED. PLEASE ADVISE.


you have no power to the thermostat check to see if the furnace switch is on or if the blower cover is on properly.

Oct 17, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Thermostat does not read current settings or respond to commands.


HONEYWELL WEBSITE:
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

Oct 08, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Chronotherm Three thermostat vs Buderus Logamatic Computer.


The outdoor thermostat senses the the temp of the outside air, and adjust the boiler water temp according to what it knows is best. The reason that the boiler is running longer is the old boiler used to be constantly sending 180ish degree water to the baseboard, now that water may only be 140ish degrees. The idea behind this is to reduce off cycle heat loss, as the greater the temp difference between the air temp and water temp, the quicker you loss heat. The theory in boiler run time is this, the less times it starts and stops, and the long run times will give you the best efficiency. Hope this answers you questions.

Sep 28, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Furnace tries to come on then .... hold -AC.


When the thermostat says AC it means there is no power to the thermostat.

Apr 16, 2009 | Honeywell Power Humidifier: Furnace...

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