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Have an old honeywell room stat (type with round temp knob) and have taken off wall to allow for decoration. Now heating does not work. Any ideas on whether it's broken or alternatively can it be bypassed.

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Jumper red to white and it should bring on a call for heat. if it does then you probably damaged stat on reattachment. do you self a big favor and go to a digital stat. you probably have a red white yellow and green wire. hook them up same way on new stat. if you have an extra wire you can pull a common and power the new stat off the transformer, if not you can get one that uses batteries. robertshaw makes some good ones 9400 9401 etc. you need straight cool with gas furnace. they are great. no need to get to fancy and avoid the ones with programming and all. they are way to complicated unless your into lots of programming and tech details. plus those old honeywells are almost impossible to get perfectly level on the wall and if they are not level they will perform way out of whack

Posted on Oct 28, 2008

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DT92E room stat appears to be very inacurate with its room tempreture, our normal room temp is about 22c we have to set the stat at 25c to get heat and the stat cuts out after a temp rise of 1c


All thermostat is calibrated @ difference of 2 degree.to cut in and cut off.
In heat mode, if you keep 25 and your room temp 23. it will start at the end of 24 or beginning of 25 degree.Cut off also @27 degree beginning. Please check Tips & how to do's in Fixya

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We have a digital Honeywell Thermostat and it's not that old but we have the heat setting at 68 degrees and the inside temp is reading 71 and our fan doesn't seem to turn off.


Hi, Most all of the Honeywell t-stats have a temperature adjustment feature...also check the the cycle rate is the right one for your heating system... You will find all of this info in the manual for your t-stat...

Here is a tip that tells you how to get a manual for most any Honeywell productonline...

Manual Honeywell How to Find Honeywell Manuals

heatman101

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1 Answer

We had a Honeywell CT87N round thermostat installed. The heat comes on but the actual temp on the bottom stays much lower - like 8 degrees lower. Is there a way to calibrate the thermostat so that they...


One thing you can try is to remove cover, it just snaps in place.There are two plastic leveling posts at top two sides. You will need a small level commonly called a torpedo level to set on these leveling points.It should be very close to level,bubble in middle. If it's not look at base plate against wall and locate two lower mounting screws there will be a small slot where the screws go into wall to allow for slight adjustment.You will need a small screwdriver to back these two screws out a little maybe 1 turn.Adjust thermostat base so that level has bubble in middle and carefully tighten the screws,keeping t-stat held level. This should help some but it is not unusual for set temp. ont-stat to be off 3-5 degrees from thermometer reading. Hope this helps you.Thanks.

Nov 08, 2010 | Air Conditioners

1 Answer

We have this air conditioner in our sunroom. From


I would replace the thermostat.

First - be sure and un-plug the Air Condtiioner from the wall.

When you 'select' the temperture I am assuming you are doing this with a 'knob' of some sort. This knob will be part of the thermostat - therefore it (t-stat) should be simple to identify.

Note: On some - LED/Electronic units - it may be difficult to identify the thermostat.

If, however, you can easily ID the t-stat - then you will have to dismantle the AC unit enough to get to the thermostat; it will be installed on/in the unit with screws of some type.

When you find the thermostat -- simply take the wires off the connections (these are usually - 'female' type spades that slide over 'male' type connections on the switch.

When you remove the wires be sure you mark them in such a way you can replace them on the "correct" terminals of the new thermostat without getting them mixed up.

It will be essential that the new thermostat - (A) physically fit the slot that the old one did, i.e. you can re-install it as the old one was and - (B) that it will have the connections you need - in order to connect your wires correctly.

If you take the old thermostat to an Air Conditioning Supply house they will probably be able to sell you an exact replacement - but in any event - an appropriate replacement - that will work.

good luck!

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1 Answer

Old (20+ yrs.) Bryant-Carrier 397HAW060140 Furnace Fan Stays On


Its a bad high limit temp switch or sensor in the furnace that is out. The sensor is telling the board that the heat ex-changer is not cool enough to turn of the fan. www.fastacservice.com

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1 Answer

Bryant-Carrier Furnace Fan Stays On


Its the Relay on the circuit board trust me...is it a 58SX????.....very common...

Oct 17, 2009 | Air Conditioners

2 Answers

Bryant-Carrier Furnace Fan Stays On


I suspect a bad fan relay or bad fan control. Maybe the longer the control or relay is in the on position the more chance of it sticking on.

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1 Answer

Housesitting. RTH111B model. I cannot keep the


That is a NONprogramable T-stat. There is no program to overide, therefore there is no need for a "hold" option. To set the temp, place the switch on the side marked

COOL
OFF
HEAT

to the desired setting, and push the up down arrows on the front until the display shows 80.

The DISPLAY will revert back to the current room temperature within a few seconds, and will keep the unit on until it reaches the desired temp.

The set temperature remains at 80, it just shows the current room temp.

Aug 31, 2009 | Air Conditioners

1 Answer

No heat new thermostat


you have a short in the wireing.disconnect at air handler and hook-up short t-stat wire to t-stat,ifok chk wire to condenser

Jan 10, 2009 | Air Conditioners

1 Answer

My furnace cycles too often. Do I suspect that my Honeywell digital thermostat (Model CT3500A) Smart Recovery features are faulty? How to you adjust the sensitivity? Thanks!


recovery has nothing to do with on off on off. you have a new digital stat that holds an exact to the degree temp a change of a half a degree can bring it on.. so stat needs to be above main return 5 feet off floor. away from any drafts , doors supplys etc. also be sure the hole in the wall is sealed . the cold air in the wall is more than enough to make stat come on . they are incredibly sensitive.an old mercury bulb stat would have a swin g of 3 or 4 degrees . so set at 75 it may heat up to 78 and stay off till temp fell to 73 so you get a longer run cycle or and longer off cycle. the new ones are on off on off keeping a perfect temp 75 exactly. thory is the heat exchanger is already hot and a quick short cycle is more efficient than being off 20 minutes and reheating the heatexchanger from scratch again. having said that if you look aT the installer set up instructions that came with the stat it may give you an option to reset or adjust the stat so it will have a one (default) two, or three degree adjustment , so 75 equals up or down three degrees on call for heat.see honeywell toll free number in their literature

Oct 24, 2008 | Air Conditioners

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