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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.

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  • 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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6 Suggested Answers

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Posted on Jan 02, 2017

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muttandjeff
  • 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

  • 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

  • 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

Therinnaiguy
  • 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

  • 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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2 Answers

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.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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1 Answer

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

Dec 16, 2016 | American Standard Heating & Cooling

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Replaced Thermostat and now Blower Motor will not run


Sounds like a set up issue on the tstat. You say this is a packaged unit, inside the machine you should find where the tstat wires hook up. Typically red is power yellow is compressor orange is reversing valve white is emergency heat green is blower. Put red and green together, test blower. Then red green and yellow, make sure blower works again. If blower runs both ways it's either the tstat wire or tstat itself. Make sure you are landing wires on dedicated heat pump terminals, make sure in settings you are set up for heat pump with back up electric heat and TSTAT CONTROLS THE FAN. Good Luck. Also if there is a switch on the tstat for gas or electric on the back you want electric.

May 12, 2017 | Heating & Cooling

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Ac unit runs, inside blower shuts off after 2 mins, compressor continues to run, t-stat still calling for cool


My central AC unit decided to stop on the hottest day of the year. It would start and run normally for a few minutes and then the blower would shut off. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. This was easy to get to and replace and my last hope before waiting for someone to come fix it. The capacitor cost $4.04 with tax and had my AC working again. Needless to say I was beyond happy. I hope this can help others with a similar problem.

May 20, 2012 | Heating & Cooling

1 Answer

My outside unit runs a little while then shuts off.


More likely the out door fan motor has bad bearings and that would cause the out door unit to run for 15 to 20 min but it could be low on freon
when the out door unit runs after 3 to 5 min the larger of the two copper lines going into the unit should be ice cold

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

Sep 01, 2009 | Honeywell Heating & Cooling

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Coleman A/C-Heat Pump Start and Stop Run Problems


well you have it great job! on the out door unit when it will not shut off disconnect the yellow wire on the stat wires coming from inside if unit stops stat bad if not contactor "points' if they look pitted or buzz change them #1 reason for compressor failure high amp draw thru bad contactor hope this helps aboout 15.00 at hvac store seperate wires with zip ties so dont get mixed up if only one set of points then 30amp single pole 24vac coil contactor

Jun 04, 2009 | Coleman Mach III Air Conditioner

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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.

Jan 27, 2009 | Heating & Cooling

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My heating/cooling blower (not the outside unit but the fan in the garage) does not turn off, even when my Honeywell TH8000 is set on automatic. What can I do to have the fan motor shut off?


try hard wiring your 24 volt that goes to the outside unit to the yellow wire coming back from your thermostat make sure the yellow wire is on the yellow terminal on the thermostat (honeywell) i have run into situations when this seemed to be the only thing that worked

Jan 13, 2009 | Honeywell Programmable Thermostat Heater

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Blower fan keeps shutting on/off,


Your blower fan turning on and off shows your thermostat is working. I am willing to bet you have the fan in the automatic condition. Check for a sticking contactor at the outside unit.

May 31, 2008 | Heating & Cooling

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