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When my unit is turned off the furnace blower fan keeps running what is the problem

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  • Coleman Master
  • 2,597 Answers

This sounds like the automatic fan control is staying on it comes on at temp rise and goes off on temp fall , the fan control could be dirty at the back of it might just need a clean .

Posted on May 21, 2011

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Posted on Jan 02, 2017

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Therinnaiguy
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SOURCE: Goodman Furnace m/n GKS90453BKAC

A constant red light (not blinking) indicates that the thermostat is not calling for heat. Of course you know it is but just to be safe, jump out R and W on the board. If it continues to do the same as you indicated, replace the board.

Posted on Dec 05, 2007

  • 89 Answers

SOURCE: Coleman Presidential II Model 7656A Mobilehome Furnace blower p

have you changed t-stat? if so you need to increase the heat anticipator. if you have a fan limit switch, the setting may need adjusting. Thay will change with age

Posted on Nov 01, 2009

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


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

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Blower fan continually runs


It may be but the fan control may be set to turn off at to high a temp, or theres a short between ;r; and g at the stat or furnace or sequencer, IF it runs through it. A limit or rollout switch may have failed but this will keep the unit from firering. Check for a manual blower switch that may be on. At stat it should be at auto and alsso at the fan control. A stuck relay is always possible,

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Furnace lights blows heat in cycle, pops sensor on blower and continuosly blows air until button on sensor is pushed back in


If the sensor knocks the unit off and the the fan keeps blowing without a flame ,the limit (the sensor is a limit comptroller that turns off flame @ a set temp and allows the fan to run until the heat exchanger cools to @ set temp) has out lived its lifetime and needs to be replaced.the button is a manual reset that once reset would allow the unit to continue to run flame and blower at the same time after having been set once, if it is an ongoing problem and needs to be reset more than once then replace the limit control (sensor) in kind. (With the same mode and set-points for the limits)

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Auto fan does not start electric furnace


see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
If there is not enough heat, raise the thermostat setting five degrees to see if it turns the unit on. If the unit still does not generate enough heat, check the comfort controls . Clean or replace a dirty filter, clean the blower assembly (see the Forced-Air Distribution Fix-It Guide), and make sure that all registers are open and not blocked.
If the furnace turns on and off repeatedly (cycles), clean or replace the filter; and clean the blower assembly (see Forced-Air Distribution Fix-It Guide).
If the furnace is noisy, make sure access panels are mounted and fastened securely; spray squeaking belts with fan-belt dressing and replace worn or damaged belts; adjust the blower belt; lubricate motor and blower oil ports.
If the element does not heat, refer to the Heating Element Fix-It Guide for guidance.

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Removing furnace blower fan


1)Flip the furnace circuit breaker to the "Off" position to turn off the power to the furnace unit.
2) Press in the release button and pull the door off.
3)Remove the nut holding down the control panel of the furnace unit using a 7/16 socket wrench. The control panel is often found below the burners of the unit. Let the control panel hang in place.
4)Remove the two nuts holding the blower assembly in place with a 7/16 wrench. Lift the blower out.
5)Remove the bolts holding the assembly together and remove the fan from the unit.

Jul 22, 2012 | AO Smith Lennox Furnace Motor P-8-6426 3/4...

1 Answer

I installed an RTH2300 this winter to replace an old mercury thermostat. It worked fine for the heating season. I turned it to Cool for the first time today and my AC and furnace blower will not turn...


Maybe turn selector switch to off.see if every thing shuts off.if yes. turn FAN selector switch from (auto) to (on) mode.does the outside unit come on or does just the furnace blower only run ? the inside fan should be the ONLY thing on.if not, reverse the (G) & (Y) wires inside the new thermo.

Jun 07, 2011 | Heating & Cooling

1 Answer

My furnace the burners light and come on and heat up the unit. But the fan never kicks on and blows. The fan itself works because I can turn it on manually so I know it's not that. The trouble code...


The manual selection on the thermostat bypasses the fan relay. When in Auto, the fan relay turns on the blower. You are probably looking at replacing the circuit board. As far as the three blinks, on the reverse side of the front panel there is a wiring diagram and error code chart. It will give you a starting point where to look for a problem. The three blinks could indicate an open limit because the blower is not operating. Keep the blower on manual and let the furnace run normally until you can figure out what the problem is.

Feb 23, 2011 | Intertherm Heating & Cooling

1 Answer

My furnace heats the house well, but during the cool down it actually blows cold air dropping the temperature causing the furnace to re-ignite. How do I adjust? Goodman - GMS9/GCS9


Depending on the age of the furnace you may be able to adjust the cool down. On some furnaces there is a silver box usually made by honeywell. This is your fan limit control. If you take the cover off you will see a dial with different temperature settings with 3 pins in a grove. The first one is fan on with temperature rise this turns the blower on when the furnace starts and warms up. The second is the fan off after furnace shuts down, this would be the one you want to adjust to a higher temperature to keep the blower from blowing cold air. The last pin is the high limit if the furnace gets to this temperature it will shut the furnace off but keep the blower running. Make sure that the thermostat fan option is set to auto and not on.

Jan 02, 2010 | Goodman GMS90703BXA Heater

1 Answer

Dry house, albeit have two april aire humidifiers


The reason you can not run your humidifier while the blower is off, is because all the humidity would condense almost immediately and rot out your duct work. If you find that the humidity provided during the cycle of your furnace is inadequate, I would suggest purchasing a table top unit, and keep it in the room where you spend the most time. So, the answer to your question is no, you can not run a humidifier while your blower motor is off. Hope this helps.

Dec 13, 2009 | Aprilaire 700 Humidifier

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