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My thermostat will not stay at the set temperature it will increase temperarue higher on it's own

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Thermostat is buggerd on the inside

Posted on Jul 19, 2008

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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

Series 48000 with heat pump we don't want this to run all the time will the heat shut off when it reaches a certain temp also if the power goes out does it come back on automatic we want to heat our place...


Not sure about your particular make and model, but air conditioners are designed to work with a thermostat to control the functions. A properly functioning thermostat will stop the compressor when the set space temperature is satisfied. When the space temperature falls below (heating) the set temperature, the thermostat should turn it back on. In the event of power failure, an electronic thermostat probably will not operate at the previous set temperature when power is restored, but maybe at a higher temperature (but will work).

Dec 05, 2013 | Coleman Mach 15 Air Conditioner

1 Answer

My Lennox MS7 heat pump was installed about a year ago and hasn't had any problems until last week. It has started changing settings (like on or off, higher temperature, light on or off) without prompting...


Go to the unit locate the control module. Take wires to thermostat out. Now jump from R to Y your AC should come on. Jump R to W your heat should come on. Jump R to G your blower should come. If you have done these and it stay on or run as it should then you need a new THERMOSTAT.

Oct 26, 2013 | Lennox 7 Series MS7-HO-30P MS7-HI-30P Heat...

1 Answer

The heater will not turn on until i move the thermostat


Moving the thermostat to a higher temperature is the way they are supposed to work. Then, once it reaches the temperature you have it set for and holds it for 5 minutes or so, it will turn back OFF. Then turn back ON, once the temperature drops below what you have it set on. It appears it's working normally, from what you described,

Mar 29, 2011 | Air Conditioners

1 Answer

If i am away for any length of time, do i put the temp on vacation? does the water still get warm?


Since you didn't provide the brand & model of the thermostat, only generic help can be provided.

Most furnaces that run on oil or gas, make hot water all the time, 24 / 7 - winter, summer and everything between so to speak. They are controlled by an aquastat that may be set for any value between 140 - 180 degrees F. This is called "hot start" - simply because when the thermostat is set to a temperature higher than the room (turning heat ON), the water is already hot in the furnace, and is circulated immediately. If it was a "cold start", you'd have to wait for the water in the furnace to heat up from room temperature. This would substantially increase the amount of time it would take to heat the room.

Generally, the "vacation mode" simply halts the program from running. If your thermostat changes temperatures several times during the day / night, it will simply hold the lowest temperature - or a predetermined temperature built in - or chosen by you. You'll need to consult your manual to determine just how your thermostat handles the vacation mode setting. Post again if you can't find the manual - but tell us what brand and model it is.

I hop ethis helps - good luck!

Many heating thermostats don't allow for setting a temperature below 45 degrees F so freeze ups shouldn't be a problem.

Sep 30, 2010 | Air Conditioners

2 Answers

Thermostates not work properly,


I had the same problem just read the instructions very careful and you will be able to figure that out. I mine has two settings in the morning and two settings in the afternoon.

Jan 15, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

4 Answers

Frigidare window air conditioner with remote control about 3 yrs old. All controls seem to be working except when the energy saver mode is suppose to shut down the unit / the display goes dark but the...


Hello, I can assist you.

If the unit is supposed to turn off and it doesn't, it will be necessary to check several things.


  • First, is the unit cooling properly? See the section entitled "The air is cool but doesn't seem cold enough."

  • Next, is the temperature of the room adequately cool? If the room temperature is cold enough try setting the thermostat to a higher temperature. If the unit then seems to work properly leave the thermostat set to the higher temperature.

  • If the unit is cooling properly when it is turned on and the room is not cool enough the problem is probably that the unit is trying to cool an area that is too large for its capacity. Use the following chart to find the appropriate size air conditioner to use:

AREA TO BE COOLED / CAPACITY (BTU/HR)

100 to 150 square feet = 5,000

150 to 250 square feet = 6,000

250 to 300 square feet = 7,000

300 to 350 square feet = 8,000

350 to 400 square feet = 9,000

400 to 450 square feet = 10,000

450 to 550 square feet = 12,000

550 to 700 square feet = 14,000

700 to 1000 square feet = 18,000

If the room is heavily shaded, reduce needed capacity by 10%

If the room receives a lot of direct sun, increase needed capacity by 10%

Add 600 Btu/Hr for each person in the room if there are more than two people

If the unit is for a kitchen, increase the capacity by 4,000-6,000 Btu/Hr.

If the room size is too big for the air conditioner you have two possible choices. Either decrease the room size by shutting some doors or partitioning off an area of the room. Or, increase the BTU of the air conditioner for that room by installing a different air conditioner with a higher BTU rating.

Aug 02, 2009 | Air Conditioners

1 Answer

The setting is for too long a cycle , both for starting to cool and stopping.


Is your temperature dropping in the area it is cooling? If so the thermostat must be causing too long a run cycle especially if it keeps getting colder.

Are you also saying it stays off too long before it comes back on too?

This on and off "cycling" is the responsibility of the thermostat. If it has no drafts blowing on it and the air temperature around it is what the thermostat is seeing then the thermostat may be confused.

If you are trying to cool down a room a few feet away and it has closed doors or exposed to sun walls this is a load problem. You need to reduce the load shading inside, (or if you need to,,, outside) insulation in the wall ceiling or close doors or increase duct size.

Jul 10, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

Remote thermostat off several degrees


if you can locate the sensor the remote thermostat is sending the signal to you may be able to get terminals to wire a thermostat to let me know if it is possible what the terminal letters are normally G is fan, Y is cooling, w is heat, red is 24v hope this helps

Jan 06, 2009 | Dometic Rooftop RV Air Conditioner

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