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Manual / auto fan control

Air seems to work on auto. unit shuts down when temp is obtained and starts when temp rises. when fan sw. is set to On motor labors and does not come up to speed

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Sounds like the problem is fan switch related. That is if the speed of the fan is controlled through the switch.

Posted on Jul 24, 2008

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1 Answer

What should I do?


have you checked make sure the fan is in AUTO it is very easy for someone put it in manual.

Jul 30, 2014 | Heating & Cooling

1 Answer

My Coleman direct vent forced air furnace 7995-656/D will fire up but the auto fan does not come on. I can cheat this by cutting the fan to on after the burner heats up. Whats my problem?


two things the pressure switch not working or the fan control afc not working could need cleaning at the back of the afc try this the afc works on temp rise to bring on the fan afc temp fall to shut of fan so it sound like the afc is not coming on at temp rise, also check if air filter is clean

Jan 19, 2011 | Coleman Propane Forced Air Heater...

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

I can't get my furnace fan to stop running-even in the off position


Your thermostat has AUTO and MANUAL for fan Make sure it is set for AUTO. If it is set for AUTO and the heat is off and cooled down AND the fan still runs then that will be a bad relay. If yours is newer then the board will need to be replaced. If yours is an older model you may need to replace the fan and limit switch8fe474e.jpgThis mechanical switch works on rise in plenum temp. It turns on the fan a around 110 f and it shuts down the fan at 90f. Newer furnaces use timers and relay on the IC board.

Oct 26, 2010 | Heating & Cooling

1 Answer

No boot and CPU overheat warning siren. The CPU fan appears to be working. This old computer was recently packed up and moved, but booted once after the move.


Although the cpu fan may be working, the alarms are set to a temperature setting, so if the heat-sink that the fan is mounted gets clogged with dust ,dirt hair etc.. the processor temp rises and the alarm goes off. And in some cases if the user doesn't shut it down within a certain time period it is shut down automatically.
When you boot it up, the temp might be rising to that setting faster than the operting system can load.
Try a vac to clean it / or compressed air to blow it out

Sep 15, 2010 | Intel D945GNT Motherboard

1 Answer

THE FAN WONT SHUT DOWN ON MY DUCTED HEATING. THE HEAT DOES BUT NOT THE FAN. IT SEEMS THAT THE ON/OFF BUTTON ON THE WALL UNIT IS NOT WORKING. THERE IS NO REMOTE CONTROL FOR IT.


Check the thermostat ... assure the "FAN" setting has not been set. FAN makes the fan run all the time. You want your switch to be set on "AUTO"

Thanks for your interest in FixYa.com

Aug 12, 2010 | Heating & Cooling

1 Answer

I have a goodman gmp125-4. The heater comes on the furnace fires up with all the burners on and it shuts off after maybe 5-6 minutes and then the module light blinks 4 times. Are there any solutions for...


You have a serious problem. That is the primary limit overload in the heat exchanger. Either your gas pressure is too high...checked with a manometer should be 3.5" w.c. for Natural gas and 10" w.c. for LP, or your air speed is too slow. If you have a restriction in the duct, even dirty filter, your fan speed will slow causing the temp rise from return to supply air to rise. The unit data plate has the temp rise range on it...for that unit it is probably 45-75 or close thereabouts. you should check the air temps a couple of feet from the unit on the return and supply duct. If the data plate shows 75, or whatever, your actual temp rise should be 10 degrees below the max on the data plate or in that case 65 higher. This unit has a three speed motor, if Black from the motor is not on the heat terminal of the control board,start there. With power off, put the black wire on the heat stake on on the board. If it is already on the cool spade, you can make a jumper and use that same speed for both heat and cooling. After this is done, recheck the temp rise on the air and see if you get about 10 below the max on that temp rise data.

If the temp rise looks good, be very careful in doing this; with power off, remove the primary limit, which is the one going into the exchanger, and either temporarily jump out those two wires or just set it aside still hooked up so the wires dont touch anything and with a temp probe or thermometer stick in the hole where the limit goes, start the unit and check the temp at that spot. That limit is 210 degrees. If it is rising higher than that and you are sure the temp rise is good, you probably have crack in the heat exchanger shooting hot air in that area close to the limit.
Hope that helps.

Jan 05, 2010 | Goodman GDS80904BNA Open Flame Heater

1 Answer

Stops cooling after a few mins


Check the condenser fan motor It probley has bad bearings and over heats and shuts down
after 15 or 20 min of run time

Jul 25, 2009 | Heating & Cooling

1 Answer

Keeps running after shutting off-does not react to temperature co


it is normal for the system to run on its own without being turned on...the compressor motor needs to cool down and will run in an unloaded state. feel the back of the unit while its running and you will notice the amount of heat the motor generates. let it run.

Jun 18, 2009 | Heating & Cooling

1 Answer

I set the thermostat to 70 degrees but it doesnt cool down to 70, it seems that the temp in the house only rises, instead of cools down.


Setting Unit at 70* ? and not cooler ( dropping temp in the house ) Question ? does temp dop at all, if so the Unit maybe unsized, if the temps are going up then the unit is not working at all - maybe just the fan is running. If this is a split unit ( outside unit / furance). A number of things could cause the same problem - call a sevice company. it could be anything -from a Breaker to an electrical part, split Units have to different breakers ( fuse) . Check that first

EM

Apr 26, 2009 | Heating & Cooling

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