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I have the AOU18RLXFW model. We want to use the Minimum Heat Operation, but the fan is running continually. Is it not possible to set fan to AUTO when using Minimum Heat mode?

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3 Answers

I have new blower motor. it dosen't stop running


Could be a bad blower motor resistor,mounted by the blower.

Sep 28, 2016 | 2002 Dodge Ram Pickup 1500

1 Answer

My furnace wont turn off


Well Linda, is it the heat portion will not shut off or just the fan in the furnace that continues to run?? If the heat won't shut off, it will get uncomfortably HOT in your house, if its just the fan.....well, its just the fan.

More than likely its just the fan and it is running continually due to a stuck set of contacts in the control board or in the fan control board, if so equipped. If it is a furnace that is older than 15 to 20 years, it could be a mechanical relay that controls the fan directly off another control in the furnace vestibule that senses heat in the heat exchanger. If its an electric furnace, the first stage heat sequencer could be stuck closed causing continual fan operation and possibly one heat element is also energized. There are also several additional issues that could be the cause.

At any rate, its time to contact a reputable service entity to correct your problem. Good luck, Linda.

Dec 04, 2015 | Heating & Cooling

2 Answers

Indoor blower won't shut off on heat pump


I would look to replace a relay that is not shutting off or replace the thermostat itself.

Nov 14, 2015 | Honeywell Heating & Cooling

1 Answer

Does the fan operation bring in outside air or just circulate air inside the space?


The fan is the same one use to circulate air thru the heat or A/C coil. When set to auto, the fan only comes on when the thermostat senses that it needs to add heat or cooling to the space. When set to on, the fan runs regardless of whether or not it is adding heat or cooling on not.

Mar 13, 2015 | Heating & Cooling

1 Answer

What is a E4 code mean


Error Code:
E1 Loss of communication between the Single Zone LCD thermostat and the mod-ule board. LCD will cycle between E1 and the previous mode setting. System
will shut down.
E2 Open circuit or out of range Indoor Temperature Sensor. Heating and cooling
operation will be locked out. Fan operation can continue to operate.
E3 Shorted Indoor Temperature Sensor. Heating and cooling operation will be
locked out. Fan operation can continue to operate.
E4 Open circuit or out of range Outdoor Temperature Sensor (select models). Heat
Pump operation will be locked out. Air Conditioner, Fan and Furnace operation
can continue to operate.
E5 Open circuit or out of range Freeze Sensor. Air conditioner mode of operation
will be locked out. Furnace, heat strip, heat pump and fan mode of operation can
continue to operate but displays the last temperature set-poi

Dec 18, 2012 | Dometic 3313192.000 White Single Zone LCD...

1 Answer

Have installed a new Honeywell thermostat. The fan does not turn off even when the room has reached the desired temperature. I originally replaced th ethermostat because the old one the fan ran forever and...


Most T-Stats have a On / Auto on a forced air system. On means the fan will run all the time even if it is not calling for heat. Auto only runs when calling for heat. Does the fan turn off in the auto mode at all? To test it...BE SURE THE FAN IS IN THE AUTO MODE ON THE T-STAT... Turn the thermostat all the way down and keep it there for appox 15 mins. If it is wired properly and the fan limit is set properly the fan should turn off. If it doesn't it is not the thermostat were the problem lies.

Most forced air units have a fan / high limit switch. There is a setting on the switch for the fan to turn on and a setting for the fan to turn off or it has a setting and a differental switch for it to turn off/on. Example - the fan comes on when the temp in the heat exchanger reaches 110 degrees F and will shut down at 95 degrees F after the thermostat is satified...this would hav a differental of 15 degrees F. It may be set to low and the fan continues to run long after all of the heat has been removed from the heat exchanger. This in turn will cause cool air to be coming out of the registers.

Mar 09, 2011 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

The fan has auto ond on selections, the heat looks to be running fine but the fan will NOT shut off.


The thermostat needs to be set for AUTO. If you have it on auto and the fan still goes even though the heater is off then you probably have a stuck fan limit. The limit has a long probe which goes n the plenum. As the heat builds in the plenum at the start-up of a warming operation the bi-metal inside that probe slowly twists around till the temp inside is 110 degrees, the fan comes on and we have warm air in the vents. Then when we have a cozy house the heat shuts down. The fan keeps a going till the heater cools down and the bi-meta twists back around and shuts down the fan. So what goes wrong? The bi-metal simply gets hung up in that position. Tapping on the dial will sometimes release it but it will keep occurring and become aggravating. themobilian_306.jpg
These limits come in various sizes and brands but this is the most common one. If your machine is a newer model then that control board has a fried or stuck relay on it.

Nov 28, 2010 | Heating & Cooling

1 Answer

Fan does not turn off even after disconnecting


Are you referring to the fan on the external mechanism, or the internal air handling fan?
The external fan is not controlled by the internal thermostat. it is controlled by the thermos-witch of the compressor. The external fan may or may not run when the motor is operating. it depend totally on the temperature of teh compressor, and not the internal thermostat.
It the internal air handling fan is running continuously,it may be a a problem with the fan setting. check if the fan is set to 'ON' instead of 'AUTO', and correct it.
Incidentally the fan operation I described, is for modern, energy efficient heat systems. This is a energy saving design incorporated in all heating systems including automobile radiator fans.

Jan 31, 2010 | Goodman Heating & Cooling

1 Answer

I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...


The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

Oct 17, 2009 | Intertherm P3RA-048K Air Conditioner

3 Answers

Ptac fan keeps blowing


Try setting the fan control to "AUTO" this will cause it to cut out with the compressor.

May 02, 2007 | Amana PTH123B25AJ Heat Pump Air...

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