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Thermostat changes temperature on its own

Set the temp at 65. Shortly thereafter, the temp is 68. Then a little later, 70 and sometimes higher. Compressor never shuts off and then eventually it freezes up. Water runs out fine. Installed with slight downward angle away from window.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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tborn6
  • 700 Answers

SOURCE: Furnace doesn't reach desired temperature

On the thermostat if its a manual on then pop the cover off and look for a small dial with numbers on it. Take and move it tpoi a higher number than whats it is set at. Its called a heat anticipater and is supppose to make it so that the unit does not oveshoot or under shoot like what your experiencing. If its a digital oine then you are going to have to configure the setting in the insdtallers menu.

Posted on Dec 21, 2008

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pierre1811
  • 144 Answers

SOURCE: electric furnace won't shut off

It sounds like a bad or badly miswired T-stat

Posted on Jan 20, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: Rinnai 1004 - Temp on thermostat reads 10 deg cooler than actual, keeps running

Behind the unit near the floor level, is a yellow wire with a black bulb at the end. This is the actual sensor for returning air. If there is cool air infiltrating the area where it is located, it will keep the unit running until the return air reaches temperature. You could also have a bad sensor but highly unlikely. Make sure there is no air infiltration influencing the sensor. Also, you can unclip the sensor and pull out a few more inches of wire to locate it higher up away from the floor. Tie it up with a wire tie.

Rinnai it testing a remote thermostat but as of yet, there is no plans to offer one.

Posted on Nov 26, 2007

hotuna
  • 288 Answers

SOURCE: thermostat does not stop heat pump unit

Most of these problems are the program settings on these way overcomplicated thermostats. You will need to re-read the instructions on setting the programs. Or bite the bullet and buy a cheaper and simpler one. If you installed it yourself, make sure the settings on the inside are correct, like gas/electric heat, and 24 volts, stuff like that.

Posted on Mar 14, 2008

  • 1073 Answers

SOURCE: TEMPERATURE CONTROL PROBLEM

yes

Posted on Apr 12, 2008

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1 Answer

Why does my Honeywell thermostat state temporarily set at 68 degrees? A few days later, it will be set at 62 degrees without anyone touching the thermostat?


It's a programmable thermostat. When you change the temperature, it will say temporary until the next programmed schedule starts or a set amount of time. You will have to program the thermostat to the correct temp settings you wish to have, or you can push "HOLD" after changing the temp to make it stay at that set point. Hope this helps!

Nov 19, 2016 | Heating & Cooling

1 Answer

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

1 Answer

If thermostat is set at 70 and room only gets to 65 will increasing the setting on the thermostat make any difference?


Set an undersized heater thermostat to any temperature you want - if undersized, it will not be able to get to the set temp if it's cold ...

Feb 17, 2015 | Heating & Cooling

1 Answer

I don't know a good setting on a robertshaw 9420 thermostat, for really cold,and fast air condition.


Well Brian, an air conditioner creates the same temperature drop across the evaporator at any thermostat setpoint, so there is no setting that will get it really cold really fast. If your return air is 88 degrees (in a hot house where the system has been off) the supply air temp is going to be near 68 degrees..... as the a/c runs, the air changes within the structure cause a reduction in the average return air temperature and slowly drops the return to 87, then 86 then 85 etc, etc and the corresponding supply air temp continues to drop from 68 to 67 to 66 to 65 etc etc. Eventually the supply air temp after the appropriate 'air changes' within the structure will drop to 55 degrees and possibly even lower to satisfy the average room temp at 75, 74, 73 etc. to a point.

There are SOME newer a/cs that have two speed compressors that may effect the supply air temperature drop under differing load conditions, but thats a different ball of wax.

So, if you want it cold quickly you are out of luck, just leave the t-stat set at 70 degrees and pay the electric bill when it comes in.....

Dec 25, 2014 | Heating & Cooling

1 Answer

How do i adjust AC temperature variance on a Honeywell TH5220D1003 thermostat


If you are talking about the difference between heating mode and cooling mode and the room setpoint, you can not change it. It comes from the factory with a 3 degree difference. In other words if you raise the heat setpoint until it is within 3 degrees of the cooling setpoint, for every degree you raise the heat setpoint the cooling will raise a degree.
About all you can do is increase the distance between the heat and cooling setpoint. To do this either lower the cooling setpoint to 3 degrees higher than the heat setpoint you want and then increase the cooling setpoint the desired setting. For example heat and cool setpoints are 67 and 70 respectively, and you want 65 and 73. Lower the cooling setpoint to 68 and then raise the cooling setpoint to 73. Now your heating will come on 3 degress lower than 68, the 65 you wanted and cooling will come on at 73. Remember, the thermostat new setpoints will turn on the cooling at 75 and turn back off at 73 and heat will turn on at 63 and turn off at 65.
You can perform the same using the heating setpoint, just have to look at it backwards. If you need to lower the difference I recommend a 8000 series thermostat. They are the most functional thermostat that Honeywell makes, be in mind they are about 3 times more expensive and many of the setting require a well trained tech to interpret and set properly.
Hope this helps.

Aug 24, 2014 | Honeywell Th5220d1003 Non-programmable...

1 Answer

Trying to set temp on honeywell t-stat


I believe what your experiencing is the 75 degrees is the hold temp position...the display then reverts back to the actual room temperature...it doesn't mean the set temperature changed back to 65 degrees. Try to reprogram the thermostat schedules, and try not to use the hold function...just the temporary hold. (which is bumping the programmed temperature up or down until the next programmed period)

Dec 09, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Fasdfas


Does the furnace stays off?.
Furnace are ment to cycle on and off because of limits .If you set to 70 furnace would cycle several times before reaching that temperature.
Just make sure your filters are clean and you got proper return air flow because lack of air flow will cause furnace to shut off sooner than normal

Jun 08, 2017 | Heating & Cooling

1 Answer

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 set the temp. 70. furnacce start fire up and then stop around 68. dosen't got up to 70.


Check to see it your thermostat is level. If it is crooked it will affect the temperature by a degree or 2

Jan 08, 2011 | Heating & Cooling

1 Answer

Temp doesn't shut down when preset temp reached. Have to do it myself. Set it for 62 for example, won't come on till I set it to maybe 70. Try to set the temp to maybe 65, doesn't shut down till we...


This is normal. It will only turn on when the temperature set is below the ambient temperature in the area around the thermostat.

Your problem may be the location of the thermostat is not ideal form the areas you are heating. this usually cause the temperature in areas vary from the thermostat to the point wher relocation of the thermostat is sometimes the best resolution.
this is often the case wher ther are multiple heating zines in a building, and one or more zones interfere with the thermostat of others,

but it also happen in single zone heating systems too.

Jan 30, 2010 | DeLonghi DCH4120 SafeHeat Ceramic Compact...

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