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Unit will not shut off

Blower runs and the unit heats, but will not shut off even with the thermostat turned off. The outside unit is not running, apparently the unit is just using the electric coils to heat. It gets hot in the house and I have to turn the breakers off to shut the unit down.

Posted by Bobby Copeland on

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1 Answer

mike kirschbaum

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  • Master
  • 1,198 Answers

Is the thermostat wired to the unit? If so, note the wire locations and disconnect them. If the unit stops it's the thermostat. If the unit keeps running, it's the unit.
If the thermostat is wireless, change the battery and test the unit.

Posted on Nov 29, 2013

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5 Related Answers

muttandjeff

Allen Neal

  • 359 Answers

SOURCE: Blower in Attic not running

inside unit has fan control relay , either on control board or can be separate ,except for the 24 volt transformer and the t-stat the units operate separately concentrate totally on the inside unit this is where the problem lies

Posted on Nov 08, 2008

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Mark Egan

  • 1214 Answers

SOURCE: rheem heat pump. blower will not turn off

The fans are set to delay for 60-90 seconds to remove all heat from the heat exchanger/heater elements.

If the fan runs any longer than 3-4 minutes after the Emergency Heat shuts off, you may have a bad sequencing relay in the air handler.

Posted on Jan 27, 2009

Anonymous

  • 37 Answers

SOURCE: fan running constantly in the house

Check t-stat and make sure fan is set to "Auto", that might be why fan is running all the time, or it could be a fan relay that is stuck closed. It sounds like you A/C is over charged or you have a bad high pressure switch, this was a common problem with this manufacture especially in the heat mode.

Posted on Apr 25, 2009

Anonymous

  • 1420 Answers

SOURCE: Blower keeps running even after thermostat is in

This could be an indication that there is an error code flashing on the control board and needs to be addressed. Most newer units like this indicate a problem by running the room air blower to alert the homeowner something is wrong. Really! Without shutting off the power to the unit, look for a small viewing port that looks into the cabinet. You should see a blinking light that will blink a number of times, pause then blink another number of times. Once you get this number, say 3-4, look at the wiring diagram pasted on one of the door panels for a diagnostic chart. It will give you a starting point where to look for the problem. If you have one. Or you could have a bad control board or shorted wire. Make sure the air filter is clean since you will be in front of the unit, you would not believe how many times I have to charge $100 to replace a filter the home owner could have done for less than $20.

Posted on Mar 11, 2010

Anonymous

  • 141 Answers

SOURCE: My thermostat inside my house will not shut off,

sounds like you going to need a new stat

Posted on Apr 08, 2010

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Does outside unit run when thermostat calls for auxiliary heat ?

Assuming you have a heat pump .If thermostat is on emergency heat which is auxiliary heat outside unit should not run .
If it's in heat mode and heat pump cannot keep up then it will call for 2 stage heat and that is when your outside unit and electric heat would run at the same time .
If outside unit have a outside thermostat and it too cold then outside unit should shut off by the outside thermostat
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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?

With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
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Heat works until thermostat calls for aux heat, then blower shuts off with outside unit still running.

Some blowers shut off depending on the system. Do you have electric hest strips inside? If not the blower will shut off. The outdoor fan should not be running if in defrost mode. If you have heat strips then you likely have low voltage wiring crossed

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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Replaced Thermostat and now Blower Motor will not run

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If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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My outside unit runs a little while then shuts off.

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If the thermostat you just installed has a time delay that will keep the indoor blower motor running for up to 5 min after the unit shuts off
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Rheem heat pump. blower will not turn off

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