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I have a Braeburn 3200 and when the the temperature reaches the desired heat setting. The furnaces heat will shut off, but the fan will continue to run indefinetly. eventually blowing very cold air up

Also if I set the thermostat say to 72 degrees and the temperature within the house is at 69 degrees. The furnace will kick on but seems to not want to ignite. But if I raise the setting up anywhere above maybe 78-85 degrees. The furnace will ignite an throw great heat. When the house reaches the desired 72 degree mark, I must manually turn the thermostat to the off position. If I turn it back to the 72 degree mark it will of course de-ignite the furnace. But again the fan will continuously run indefinetly. running right thru the usual, brief cool down period. Until the fan itself will be the cause of the house becoming cold again. What is up with that I ask of the experts ?

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The fan relay is stuck in the on position. When the temperature drops the heater does not ignite because the fan is already running and ignition is locked out after the heat cycle starts an the fan turns on

Posted on Nov 17, 2014

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Posted on Jan 02, 2017

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SOURCE: Furnace doesn't reach desired temperature

One of two things you can try. Do you own a volt ohm meter? Anytime your unit cycles short like it is doing the control circuit which on this one is 24 volts that engages relays and controls the gas valve to open and close. I am thinking the heat exchanger is getting so hot it is tripping the upper limit which for the most part is around 180 degrees. So next time it turns off take your ohm meter and with the power to the whole unit off. Either turn the breaker off or there is a light switch that is real close to unit turn it off. Undo the two wires to the gas valve and ohm them out. You should have continuity if you get nothing check each limit switch should have a couple. Undo wires to them and check. If you find one that is open more then likely the upper one. They are a safety device that keeps the unit from getting too hot.

There might be another option increase the speed of your fan motor to get the heat out of furnace quicker. Look at the circuit board notice the fan wiring going to it. The Red wire from fan is low speed look to see if it is on HEAT on the board. You should have 4 speeds to pick from you could take the black off of COOL and swap wires and test the unit by doing that. I'm going to put a solution on this so I can come back to it quicker. Even though we a just testing it for now. ken

Posted on Dec 21, 2008

rayname
  • 70 Answers

SOURCE: Gas furnace continually running

Is the blower operating and are your air filters new

Posted on Jan 04, 2009

kapishtech
  • 2272 Answers

SOURCE: Honeywell thermostat; Lennox elite series

When the furnace exceeds the temperature set by the thermostat, this could be indicative of several issues. The thermostat mounted crooked. When a thermostat isn't level on the wall, it can affect the automatic on/off function. To fix this problem, pop the cover off of the thermostat and loosen the screws attaching it to the wall. Straighten the device and tighten the screws.

If the thermostat is level and the temperature regulation system is still malfunctioning, the problem is most likely with the heat anticipator setting. The heat anticipator is a device inside the thermostat that governs when the furnace turns off. When the heat anticipator is on the fritz the furnace doesn't receive accurate direction, resulting in a heat system that either runs too long or not long enough. Usually, simply adjusting the heat anticipator, which is a small disc located underneath the thermostat cover, will fix this problem.

  • Temperature Does Not Reach or Exceeds Setting


  1. Thermostat is not level ? Use a level to realign thermostat.
  2. Anticipator not set correctly ? Adjust the anticipator.
  3. Thermostat not calibrated ? Recalibrate line voltage or low voltage thermostat.
  4. Range stop incorrect ? Clean thermostat and check .if same problem then,Replace thermostat.
  5. To clean thermostat.
  • Kill the power at the circuit breaker panel.
  • Remove the thermostat cover.
  • Clean the bimetal coil with a soft, clean brush.
  • Remove the thermostat body by unscrewing the retaining screws (on a round thermostat). Slide a piece of bond paper between the lever and contacts to clean them.
  • Reassemble the thermostat.

  • Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

    Posted on Sep 21, 2010

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