Furnace Blower Motor Diagnosis And Repair




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Did this video help you?

fcorrea71: Great video. It took my fears away! A couple of days ago I noticed "weird behavior" from my heater system, like the fan keeps on running a while longer than usual blowing cold air after temperature on thermostat reached its settings (fan motor making unusual noise). One morning, the fan stop spinning and I can hear a humming noise coming from the air vents... I noticed the fan motor not spinning and humming noise will stop minutes later. The gas furnace will go on and of, so the humming noise from the motor. I tried to spin the fan manually and I felt some resistance. My fear was about major damage and costly repair, but now I got a great reference to troubleshooting and/or avoid being ripped off from a technician if I decide to go that way. My mistake: 15+ yr old unit (Lennox), never serviced besides frequent filter replacement. Thanks a lot 

Heather Wanamaker: On Thurs evening I suspected that my furnace was going bad or something was wrong, because I was losing heat, Fri morning I called a local repair place(who is excellent) and I had to order a new blower motor- and the cost with the repairman replacing it costs me almost 400 dollars. And this weekend I have no heat save for a small elecric heater

Reggie Stafford: Somebody please replace the battery in that smoke detector! ..... I hate to hear those things chirp!

Tony Frewin: Good video, you're right that the polarity of the capacitor doesn't matter, remember AC swings both ways. Also when polarity does matter you don't usually have two wires the same colour. The description of squirrel cage refers to the rotor of the motor and not the scroll type fan as so many people believe. It's a shame that there are so many greedy people that don't change an honest rate for work so people have to have a go them selves. Glad it all worked out for you. 

Doug Koehler: I'd go for the run capacitor first. I wonder if an electrician would? Nah, he'd go for the big bucks. Thanks for this video. 

teesalmon: Blaise, Thx for your comments. You are correct that the capacitor is between the start and the run. So what I have labeled as "Start" is incorrect. The start is the 6.2 Ohm leg at the bottom. And yes if I measured from the capacitor lead going through the 6.2 ohm start winding to the black I should get 6.2+2.9=9.1 ohms. I am still confused and can not explain why I measured 73 ohms from the common to the other capacitor lead. You Tube marked some of you comments as SPAM, but I left the one PSC diagram with some text you provided. Thx for pointing this out. I did say in the video that I don't do this for a living (i.e. there are definitely people that know the content much better than I do).

Murray Strauss: I really like this video. My issue is that blower wont come on when AC is on - either auto or fan. I switched the setting to heat and guess what. The blower came on - I switched the settings back to AC and it's running just fine. If I shut it off no blower fan. I do not have a volt meter so not sure how to test the safe-t-switch. Any thoughts?

Jesse Thorn: Awesome video. Really appreciate it. I just happen to have the exact same model furnace and I discovered that my motor wasn't turning, causing the heat to build up in the heat exchanger until it tripped the limit switch. Now I can probably verify if my suspicions were true. 

kosh2001: my furnace is 20 yrs old how hard will it be finding a replacement motor?

Don Jon: Should you watch video how to change battery in smoke detector?

george gonzalez: Those are not resistors inside the motor, they are windings.

boilermech: a faulty capacitor is usually the problem. and 90% of diyers wind up replacing both motor and cap. now all that money wasted and time. it pays to hire a pro. annual maintenance should be checking capacitors. if not find a new company.

Cesar Fernandez: excellent job...simply the best!!!

Eugene Korsunsky: Thank you for the demonstration, your video was extremely educational considering you are not a pro. I hope this will help me out to troubleshoot and fix my system. Thank you again, five thumbs up :D.

Patrick Riley: Did you mention what type of furnace this was and what the part number of the motor was? I would appreciate knowing this info. Thank-you.....

brianminkc: you can't measure impedance with an ohm meter. Just resistance.

Angel Advntg: Thank you SO MUCH for your video. My Brother owns a large HVAC Company, and refuses to help me. With your & other videos, you've helped me save my furnace!

Linden Wong: I thought my smoke detector was going off inside my house but it was yours. Ha Ha

harvey burrows: great video , lots of useful info.

Sridhar Sathya: Thanks; found it useful.

selva raja: knowalgble information, 

MissOseni: my furnace starts but is not blowing air. what are the chances this is what i need to do?

denclub1: Hi, thanks for your video. So if I can start motor with my hands this is mean I need new capacitor, right? I have 2 furnaces in my house and use only one for years. When cold storm hit us yesterday turn on my second and noticed no air blowing. Heater start working and shutdown after 30-60sec and blower never work even when ON position. I try to turn on blower with my hands and everything works but only until its off. Then same thing I need to turn blower with my hands. Bad capacitor?

johnny30806: Was the run capacitor on the original motor good or bad?

Deno Keller: Excellent Video !!! Thank You and GOD Bless

teesalmon: I love the comment about the smoke detector beep! You r so right, I tuned it out. I could not quit laughing. You have inspired me to replace the battery!!!

AlchemistLair: Excellent video!! I'm trying to track down why my Blower Motor is not starting and your video spells it out the best!!!! I'm with you on changing out that capacitor; might as well do it while your in there!

stanbod: Super!!! Thanks!

stephen kroswek: OMG change the battery in your smoke detector, I couldn't watch past the third .....beep....beep....beep
Rating:
Furnace Blower Motor Diagnosis and Repair 4.4 out of 5

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Furnace Blower Motor Diagnosis and Repair