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Furnace won't stay on

Thermostat is only about 3 years old. Ther thermostat is saying that the system is on. The tempurature is set for 68, but it is only 57. When the fyrnace does kick on it doesn't stay on long enough to even warm up the pipe> HELP, we are freezing and have to go outside to warm up!

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  • Anonymous Jan 17, 2009

    Same problem. Heat is set at 68 and the house is 55 in the morning. If I turn the fan ON the house warms up. Once its up to temp it does a pretty good job of maintaining temp. The problem over night is that the fan doesn't stay On long enough to maintain temp.

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Check your thermostat first. take of face of therm, disconnect wires, tie in red and white together, ,if your furnace runs ok, then your therm is bad. Thats the easiest way to test.

Posted on Dec 06, 2008

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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 | Air Conditioners

1 Answer

Furnace will not come on switch to heat sounds like it want to come on then shuts off, switch back to auto does the same thing, have no heat now late at night cold in hear now temp say's 68 have it set on...


how old is the heater?
if its fairly new, then it might be the air switch, most new heaters have a fan that clears out the unit and it must see a vacuum to start, if it's not try to find the transformer, it will be 120 to 24 volts, this will have gone bad, if that is not the problem, it could be the thermostat, check to see if you have power at the thermostat.

Mar 03, 2011 | Air Conditioners

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 | Air Conditioners

1 Answer

Furnace is 7 years old. Will not stay running for more than 5 min. Will start up again after shutting off and then run for another 5 min. Suggestions?


Check the air filter. Jump out thermostat to see if it stays running longer, if so replace thermostat. Make sure all return air ducts are clear of debris. If furnace has a Fan/Limit switch, make sure tabs are set at 100, 140 and 200. Sounds like something may be heating up and shutting unit off till it cools back down.

Jan 03, 2011 | Ruud Air Conditioners

1 Answer

Central air just stopped running, was running all day. I turned down the thermostat about an hour ago and I heard it come on. I noticed it wasn't running just a little while ago. Looked an the thermostat...


possible you have a bad contactor switch.. Have a tech look at this since it is dangerous due to high voltage and age of unit

Good Luck

Dave

Jul 16, 2009 | Air Conditioners

1 Answer

The furnace is blowing warm air even if the thermostat low.


The only thing that tells the unit to come on and off is the thermostat so I would definatly say it is it. When you turn the system back on, does the a/c run normally? If it does, then it's the problem with the heating side of the tstat. Also, does the fan come on when you put it to on and then turn of when you switch it back to auto? If it does, then the system is working fine, its the t-stat. Let me know if you have any more problems.

Mar 23, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Thermostat issue with comfort zone II.


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.

Feb 18, 2009 | Carrier 38CKC060 Air Conditioner

1 Answer

Goodman GMS90904CXA Wont ignite, light blinks 3 times


I had the same problem, I had to remove the lower black rubber stopper right next to the exaust fan and hook up a drain to the unit, as soon as the water drained out the furnace fired right up.

Nov 19, 2008 | Air Conditioners

1 Answer

We have an InterTherm heating system. The bedroom thermostat will not shut down when it reaches tempreature. This system is about 30 years old. Do you believe the problem is the thermostat or at the...


you have a bad thermostat,there must be a 3-5 degree difference between set point temp and actual room temp,is this a boiler or forced air furnace

Nov 16, 2008 | Intertherm Air Conditioners

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