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Thermostat issue with comfort zone II.

Comfort zone II Thermostat shows a reading of 76 degrees. The heat is set for 68 deg. The furnace is still running even though house temp is 76 deg. What could be wrong?

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  • Anonymous Mar 28, 2014

    Zone 3 display at t stat; if set for 64 degrees display will read 64 deg as space temp regardless of actually zone temp.. if raise zone temp up zone will react but display will still read 64 zone temp.. if lower temp to 63 etc , zone will react accordingly and stat display will show 63 etc. i have switched zone sensor with know good one and still have same condition?????

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  • 61 Answers

Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

Posted on Feb 19, 2009

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2 Answers

My thermostat is set on 68 degrees and it shows room temperature is 68, but the furnace still kickson, Honeywell said it has a 1 degree difference. so what's the problem then?


Yes there is a one degree tolerance, in fact my heater just kicked on and it is set to 67 and the inside temperature reads 67. It is also a Honeywell.

Dec 28, 2016 | Heating & Cooling

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WHY DOES MY FURNACE SHUT OFF BEFORE REACHING TEMP


Hi Demetrio
Furnaces turn on and off based on what they're told by your thermostat. The thermostat, in turn, will control the furnace based on:
  1. The temperature AT the thermostat.
  2. What the internal heat sensor thinks the temperature of the air is.
So, if your idea of 68 degrees is what the thermostat thinks is 71 degrees (thermostat reads three degrees high), then when the air by the thermostat gets to about 65 degrees (by your account), it'll think it's 68 degrees and shut the furnace off.

Also, if the thermostat is, say, near a source of local heat, like a lamp, a big piece of electronics, a fireplace, or that place that you habitually set down your coffee, then the air right next to the thermostat may be warmer than the rest of the room, and fool it into thinking it's at it's target.

The sensor is usually inside the housing for the thermostat. If it hasn't been dusted in a while, then it can be hard for air to get inside to affect the sensor, though this would generally cause it to lag on readouts and run the temperature higher than you wanted.

If you have a digital readout, and the system is saying , hey, target is 68, and the readout gets to 66 and the system cuts off the furnace.... my only other guess is that the unit may have features that are trying to prevent overshoot - i.e. by the time the temp at the thermostat actually gets to 68, most of the room is more like 73. That'd depend on your particular thermostat. At that point, you may want to call customer service with the manufacturer and tell them the issue. There may be ways to adjust the unit to get behavior closer to what you seek.

Good Luck!

DH

Jan 25, 2016 | Heating & Cooling

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I have a Comfort Zone CZ1500W showing an AO5 error code. I have 9 ohms across each element. The fan thermostat reads open. When I bypass it the fan runs, but no heat. The element thermostat reads


Everytime I turn on the CZ heater, the display reads A05 and then it goes away when i set the temp. As far as I can see and feel, I'm not experiencing any issues with the heating, fan, or thermostat or the extension cord running hot. I'm concerned that something could be wrong or unsafe, with Comfort Zone filing for Chapter 7, anyone know who is offering support or a number I can contact?

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At what temperature do I program the thermostat for a comfortable cooling(at how much do set the cool and h ow much should I set the heat). Thanks for your help


Normal settings are heat 70 and cooling 74 to 76 I like 76 if your not active its fine. They say the every degree above 70 heat cost additional 5%.

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I turned my thermostat down this morning to 68 degrees. I came back about 2 hours later to increase the temp to 70 degrees but when I push the ^ arrow instead of showing the increase to 70 it just flashes...


Since it's within 2 degrees of your setting it could be one of two things. Most furnaces run longer (pass your setting) to maintain the setting you made. Which really not a problem. However, your thermostat may need calibrating. To test this theory, place a regular wall thermometer next to your furnace's thermostat and see if the two temps match when the furnace cuts on and then when it cuts off.
If the temps are both the same, the furnace thermostat is fine.

If you're turning it down to 68, because no one will be at home during the day, just set it 2 degrees cooler than 68 degrees. You will then wind up with 68 degrees.

Feb 09, 2011 | Heating & Cooling

1 Answer

I have a Honeywell CT500A thermostat. I set it at 68 degrees. the room temperature is 62 degrees. The unit cycles on and the "flame" icon shows on the screen, but then the unit goes off ( the...


Here is a simple way to tell. Remove your thermostat from it's mounting plate, locate the wiring, the red and white are low voltage control wires. Disconnect them from the base and join the two together if the furnace runs you need a thermostat if not it is in the controls to the furnace.

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Over Tonnage A/C


A better solution than undersizing the fan (which would decrease your airflow and probably not satisfy the household as well) would be to change the deadband in your thermostat. (Disclaimer: best solution is always to have a properly sized unit!).
Most programmable thermostats have a "deadband" that can be programmed in. This deadband is a certain number of degrees, in heating and/or cooling, where the thermostat will not call the system even though you have reached a threshold temperature. I.e. System is set to call for cooling at 76 degrees. there is a 3 degree deadband. When the Tstat reads 76 it will add the deadband (3) and not call for cooling until the room temperature is 79. This will prevent the compressor from cycling quite so much.
Adjust your setpoint temperatures (i.e.76) with the deadband in mind and you can arrive at a range that is comfortable and reduces compressor cycling.
Good Luck!

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1 Answer

Blank readings on Carrier Comfort 3 zone thermostat


The stat that works is called the main and the other two are called slave stats. The stats must be set to heat or cool the same as the main. If you want one room to cool and one to heat , sorry. Need to upgrade to auto changeover. Is this AC actally a Heat pump?

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1 Answer

Furnace will not shut off


something is wrong with the thermostat.  replace it first, that would be the cheapest alternative

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