Fast Easy ECM FAN MOTOR Troubleshooting! ECM Blower Motors with Spade Terminals!

In this HVAC Training Video, I show How to Quickly Diagnose an ECM Constant Torque Blower Fan Motor. Its actually a pretty easy process but many techs get overwhelmed because of inexperience in working on them. I Show Testing Methods and Multimeter Use while Troubleshooting. I show ECM Fan Motor Types to Distinguish Between Testing Procedures. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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[Gametight]

Great video Mr. Craig. I've learned a lot from you just buy subscribing and watching!! This is really a free education and you are greatly appreciated for opening doors. Little do you know, the opportunity that you give breaks a poverty curse for some of us. This is way deeper than just a YouTube channel.✌✌

[sanseiryu]

Good diagnostic.
I had to check my daughter's Carrier AC on the the roof last week. I used to service HVAC ages ago. First time I ever ran into the ECM motor. I was surprised. I had even brought a trusty spare 3 speed blower motor I still had in the garage. One look and I said: Nope, this motor won't do.

Blower motor runs initially, then stops after a minute and a half. Checked for my line voltage at the harness, then realizing it was a DC variable speed motor, using the schematic, I found my common and hot 24v on the harness. A quick check on Y/T for confirmation about the type of motor and conclusion about the module failure, I decided against a non OEM and got one from a HVAC vendor.

I'm getting too old to handle a blower assembly on the pitched roof so talked my daughter's boyfriend through the repair. The shingles on the pitched roof were so hot, the glue on the soles became soft and the soles started to come loose on my sneakers. He brought it down to the patio and I had him do the disassembly, put the new motor in and then reinstall the blower into the package unit. Hit the thermostat and fan works, cold air in her house.

[hangngoaigiare]

Clear precise video great job. when checking power to the unit check between Line and grounding too because that what kill you. There's case that no power between L and N but there's power between L and grounding, single phase 120v to grounded anyway.

[xdropthatx]

You’re the best! Thank you for all your educational videos

[jamesortolano]

Love this channel, great video for guys in the field .!!

[anvibrimel]

Great teaching Mr.Craig, I have your books in English and Spanish and I’m waiting for the one for electrical components Troubleshooting thanks Sir.

[hidalgo]

You are a great teacher I love what you teaching us.

[robbyclark]

That’s fine if you have a 16 pin, 24v controller. Unfortunately, there are other options available for these ECM motors. I am currently working on a motor with a 4 pin communication cable with only 3 wires, and controller. Can’t find any information about what I’m supposed to look for as far as communication? I did have a 29-30 dcv so I’m going with that since the industry doesn’t bother to communicate wtf they are doing with their “new technology” for the poor suckers who are tasked with fixing this mess.

[jonathanraul]

Thank you so much for your knowledge. One more great video. You are the best!

[tedsmith]

Hello from the great state of Michigan

[riverratfishing]

Really enjoy your videos. They are very helpful. I don't get to do much on HVAC and I use your videos to help me.

[Brokefootchuck]

Never heard it called a chair adapter. I like it.

[fernandofrancisco]

Thanks for sharing this video. Really appreciate your hard work on helping every technician out there by sharing your knowledge. Thanks again

[hugogarcia]

Thanks for teaching. I learn alot thanks

[Everett-zqsc]

Hey Craig,
I was wondering if you had an answer to a question. I'm new to the service side of HVAC, I've worked as a Commercial installer for the past five years. Now I work as a Final Quality Inspector in the residential side. I was in a house just the other day with a Goodman gas furnace with the electronic dip switches on the circuit board. I was adjusting the AC1 fan speed taps so that I could bring down the static pressure as well get better airflow with my Balometer. The thing was, my static pressure or airflow wasn't changing as I was adjusting the speeds whether it was in fan speed (1) or fan speed (9). Is this common for a brand new system. I know that just in my short time of working with these units if you have these units on fan speed 9, it sounds like a jet taking off. Hopefully this makes sense, I'm in the learning stage, this was just something that I was curious about. Thanks

[hugabee]

Hi thanks for your time and effort.
My fan blower runs good when i turn the unit off for 1 hours or more, if i let it run on auto the a/c compressor starts but the fan blower doesn't why is that? A/C maintain temperature and some time works for hours with no problem then it act up, so i turn it off let it rest for a bit and i turn it back up.
Thank you

[mickrambo]

are there cases where the unit will read 24v on more than one speed at a time?

[kthbxrp]

Great job, thank you brother. You are so talented

[watermanone]

Very nice video. The thing I don't like is the very high cost of an ECM motor compared to a PSC motor. Any savings of the ECM motor is thrown out the window if you have to replace it. Also, can a PSC motor be wired into the ECM system to run the system in an emergency? Many thanks.

[Smithers]

Wondering how to know difference of if you need to replace the blower motor and module together vs. just needing to replace the ECM module?