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Goodman furnace motor is dirty

Due to dust and dirt accumulation, my motor furnace motor is whining. How do I clean the internal parts?

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Re: Goodman furnace motor is dirty

The blower motor, squirrel cage (fan) and its housing can be removed as a whole part. Disconnect the wiring harness to the motor, remove the ground wire. Look for a couple of screws that mount the blower housing to the furnace. they will 5/16 head size and usually be at the top. The bottom slides into a metal notch on the frame. With a little work and maybe a few cuss words, pull the whole thing out. A shop vac or air compressor will remove the dirt. Some dirt may be determined to stay, so a stiff bristle brush may be needed. Replace in opposite way you removed it. If the whistle remains, check the duct work and metal panels, and anywhere there is a gap or tape. This may be the cause of the whistling noise, but cleaning the vent holes in the motor and the fan blades cant hurt and will help the efficiency of the system and increase the life of the equipment. If the whining is the little vent motor up top, then try oiling with a thin turbine type oil, or just replace it, as they are relatively cheap. If you are asking about cleaning the internal parts of the motor, I wouldn't recommend doing that. If there is an oil port on the motor housing, use the oil I recommended earlier. Most likely it has a sleeve bearing not a roller type, so that's about it.

Posted on Jan 12, 2008

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I have a goodman that flashes 4 times.what do i look for

Sounds like an open limit switch. The limit switch will open due the furnace overheating. Few reasons:
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4) Improper airflow across heat exchanger.

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Cleaning instructions

Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. Dirt affects all three basic components of your furnace, so cleaning is the most important part of regular maintenance. The three parts of the furnace should be cleaned: the filter system, the blower, and the motor.

The furnace filter should be replaced or cleaned at the beginning of the heating season and about once a month during periods of continuous use. To check the filter, take it out and hold it up to the light. If it looks clogged, replace it with a new filter of the same type and size regardless of the length of time it has been used.

Step 4: Clean blower assembly, belts and pulleys to blower, and motor housing. Cleaning blower is critical if furnace has a squirrel-cage fan, because openings in this type of blower often become clogged with dirt. To clean blower, remove panel that covers filter to gain access to blower or panel on front of furnace. This panel may be slip-fit on hooks or held by series of retaining screws. Access to inside of blower is usually gained by sliding out fan unit, which is held on track by screws.

If power cord to fan assembly is not long enough to permit fan unit to slide all the way out, disconnect cord. Mark wire connections first so you'll be able to reassemble unit correctly. With toothbrush, clean each fan blade and spaces between blades. Then, with vacuum cleaner hose, remove all dirt and debris loosened by brushing. Vacuum belts and pulleys. Wipe motor housing clean to prevent heat buildup in motor.

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I have a goodman model gms80703ana the burner comes on and when the blower comes on the burner goes out.

This can be due to a dirty flame sensor or a high limit switch tripping. Clean the flame sensor first, this is a metal rod on the opposite side of the igniter, take steel wool and scrub it, then reinstall. If this does not work then the limit switch is tripping due to dirty filter, dirty blower wheel, weak blower motor. Aything that restricts airflow will cause the limit switch to trip.

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What's your problem? goodman furnace lights, burns 10 secs goes out

Hello,sounds like you have a dirty flame sensor. This is a metal rod on the oppositenside of the hot surface ignitor. turn off power to the furnace and remove the flame sensor, then use steel wool and clean the flame sensor and reinstall. Next turn back power to Furnace.

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How do I clean the soot and dirt out of my empire furnace?

If the furnace has been service annually there shouldn't be any soot in it. Soot in a furnace is caused my incomplete combustion, due to clogged or dirty burners. In any event, the bast way to clean it is use a shop vac with a brush attachment of the hose. A crevice tool will also be helpful.
To keep the soot in the shop vac, it's a good idea to purchase a dust back to fit that shop vac. They're normally used fro vacuuming sheet rock dust, but work equally well for soot. DO NOT use a domestic vacuum cleaner.

But, before you do anything, make sure the pilot light has been turned OFF and the furnace is cool.

Remove the front panel(s) of the furnace/heater and you will access to all of the inner workings.

This should help you get it clean.

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I have a goodman gpmn furnace. The ignitor lights, and then the flames turn on, then the blower kicks on, and about 30 seconds later the flames turn off, and the blower continues to blow air. We have tried...

Hello, looks like you limit switch keeps opening because your furnace is overheating, Check your air filter and blower wheel to make sure it is not dirty and make sure you blower motor is moving at the proper speeed. Usually when air flow is cutoff the limit switch will open.

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My goodman furnace will start to ignite, then it glows and then shuts off. THe fan keeps blowing. The red light blinks once. The system code says "system lockout".

Another part that you might want to check is the flame sensor. It is a very good chance that this is the problem, the stat calls for heat, the induced draft motor (little motor on from of furnace), ignitor comes on, the main burner fires, just for a second or two, the burner shuts down, the main blower motor defaults to blower on!
If this is the issue;
Then this is what you do to fix it, kill power to the furnace, look where the burners are, to the left side there is a little wire, usually yellow or orange running to what kinda looks like a spark plug, one screw should be holding it to the burner bracket. take it out, at the end of the white porcelain is a small metal rod sticking out, it probably has a slight bend in it.
take some steel wool, or sand paper and clean the rod till is is nice and shiny, NOTE: when you take it out, it won't look really dirty, maybe just like a pencil lead,,,,it is dirty!
Just use the sandpaper and clean the rod till it looks like metal, "do not sand the white porcilen". Put the part back in and turn the power back on and run the furnace as usual.
90 % chance that this will fix your problem.
The rod get a build-up on it from the sulfur that is added to the gas, and has a hard time passing the milli-volt signal back to the furnace computer, which is passed from the ignitor, through the flame, to the sensor! This way the computer knows that all of the burners are firing and it is safe to run!
Please take time to come back and rate me, or contact me with any further questions!
Have a warm day :)
Paul Gibson

Do not touch the ignitor! The part that gets bright and hot! Even when it is cold, the oil on your fingers will cause it to burn out.

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Gain access to the flame rods and make sure the orfices are clean - use a can of compressed air/air compressor with a blower nozzle. Make sure there's no dust or debris in the flame rods.

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you should not need the owners manual. most likely you will find a chart listing the diagnostic codes on the inside of the door to the blower compartment. diagnostics are printed next to the wiring schematic. the most common problem on this style furnace is just a dirty flame sensor. a small piece of fine grit sandpaper and a 1/4" nutdriver is needed. the sensor is located in front of the burner on either the far left or right. be carefull....(do not remove the hot surface ignitor that has two wires). you want the part that has only one wire connected to the sensor under the buner. pull it out and sand the dirt off of the metal rod. reinstall and enjoy your heat

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