HVAC ECM Variable Speed Blower Motor Troubleshooting! Simple Testing!

[@acservicetechchannel]

Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is the Link for the TecMate Pro- amzn.to/2jIP0ty Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ Here is the link to the 2 pairs of alligator clips- amzn.to/2CtIL5z Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o Here is the Link for the FieldPiece ST4 Dual Temp Meter- amzn.to/2AhR6ph Here is the link for the Irwin Wire Stripper/Cutter/Crimper- amzn.to/2dGTj2V Here is a link to the Stanley 6 in 1 screwdriver- amzn.to/2x7NuaZ Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. All of the ACSERVICETECH Playlists- kzbin.info/door/OZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVACR content, check out www.Patreon.com/acservicetech

[@MrGabrielmadrid]

As an apprentice service tech, I know that this training will save me time, and headaches. Thanks for posting!

[@acservicetechchannel]

Thanks Gabriel!

[@ThomasGray-f1s]

Been a tech for years. I have many ways to test these. Never seen this one. Helpful tip

[@vernroach3413]

This one I really needed..Excellent video...Bought the troubleshooting meter...Still learning and it feels great...Thanks again for a great teaching session...It helped me learn.

[@acservicetechchannel]

Thats awesome Vern! Always appreciate your comments!

[@Oscarbm1234]

You don’t ven know how long I was waiting for this video with out the tech mate pro. Thanks.

[@acservicetechchannel]

Thanks Oscarbm1234!

[@leonardocanate1177]

What about fan blower working where else to look at motherboard

[@tankttehctiw8776]

Ah man I've been waiting on this video, thank you so much!!!!

[@acservicetechchannel]

Thanks Tank!

[@jackpast]

Nice trouble-shooting tool and procedure, Craig. Thanks!

[@acservicetechchannel]

Thanks Jack!

[@vnesmuonnam]

Every time I have a question about Heating & Cooling your videos always give me the answer. Thank you so much. You are greatest instructor.

[@coolmandude1000]

Great video I use a Universal Zebra ECM tester that will analysis multiple brand ECM motors with different wiring harness attachments.keep up the great work !!

[@acservicetechchannel]

Thanks Coolmandude1000!

[@luisortiz590]

Can you send a link for the tester you have. Thanks

[@mackenziegray2090]

On these carrier models. Put your negative multimeter lead on the green wire and keep it there. From green - red 12vdc from green - yellow 5vdc and green - blue varies 1vdc.

[@ihg91]

Your videos are always a big help . Thank you

[@johnson4940]

Thank you so much👍Can you make a video walk in freezer, how does it function and how is it wire?

[@ospee2004]

My squirrel cage is jumping all over. I opened it up and it wobbles. Do I need to replace the whole assembly or just the motor? My guess is that the bearings in the motor are out. But the mounting cushions are suspect also.

[@MJ-iy4fb]

I'm curious how you determine the entire ECM is good by simply turning it on?? How would you determine if the motor will "vary" the speed or torque? Seems like there is much missing from performing a complete test of the motor. Thanks for posting.

[@acservicetechchannel]

MJ, the motor manufacturer made the tester and if you apply power to those terminals, it will tell if the motor will turn on and if it will ramp up and down improperly. If that is working then the rest of the programming is usually in tact. Then you can test the actual airflow volume using the temp rise formula, hot wire anemometer, static pressure aligned to the manufacturers specs or another method, thanks!

[@kevinkarcher1526]

Did you make another video how to test without techmate pro on the 16 pin connecter.

[@acservicetechchannel]

Hey Kevin, I believe this is the video you are looking for, thanks- kzbin.info/www/bejne/onzWepqgeq93f6s

[@littleman350]

My question more than anything is what makes the ecm go bad so often? I am about to be on my 3rd under warranty and warranty runs out in about 15 months which is about how long this last ecm has lasted. The company doing the repairs told me power going out is the biggest cause but mine doesn't go out very often.

[@boogerhead0]

One more simple question is whether or not the Nidac ECM EZ-16 motor connection is equivalent and compatible to ECM 3.0.

[@markhoffmann5941]

Does the DC Millivolt portion of the motor control module need to be tested or does that section never fail? can the motor run fine on the 24 volt AC input but not ramp up or down with DC Mv input?

[@acservicetechchannel]

The 24v is for testing and it wont communicate back and forth with the board to ramp up or down. Some manufacturers will give you DC millivolt communication voltage to read with a meter but it is simpler this way, thanks

[@gilbertopatino2616]

Thank you very much for another great video. May God bless you and keep you.

[@acservicetechchannel]

May the Lord bless you too Gilberto, thanks!

[@MrRerod]

After replacing the thermister, a year later my carrier infinity main blower motor (GE 1/2 hp 08/22/00 CNO2 011DH7) is making a intermittent high pitched whine (g#5 note) when on first stage. What would you suggest I check or do?

[@JC-sc9rx]

Can we get a video on 16 pin one? That's what I'm stuck on at a job right now haha. Thanks

[@acservicetechchannel]

If you want to support the ACSERVICETECH Channel and receive more HVACR content, check out www.Patreon.com/acservicetech All of the ACSERVICETECH Playlists- kzbin.info/door/OZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public

[@edwardgarza5104]

Will the universal ECM motors have a switch or wires to flip around for the direction of the motor?

[@Cun01441]

I jumped 24V to test my motor and it will initially ramp up for about 2-3 seconds then shut off, then my status light shows comm fault. Any ideas? I'm using a regular thermostat for a carrier infinity system, I'm wondering if this is the issue?

[@juanitogonzalez7480]

The way you bypassed the board and provided the motor terminals with 24vac on the bottom left hand terminal, would bypassing the board this way for short term period cause any damage to the motor module ?

[@hvacworkshop4791]

If you removed the fan blade (wheel), then don't run it long time. Again this is genteq method.

[@gerrychoi5769]

Thanks. Also Emerson ECM Motor manual mention a 0-10vDC.

[@acservicetechchannel]

It talks in dc voltage to communicate with the board but there is a 24v testing ability on the two taps, thanks!

[@Ggg77777]

Can this also show you a sign of a bad control board?

[@mark.r8900]

Hi, if the board talks to the motor with DC millivolt then why does it work when you're putting in 24vac to the blue and green wires? Thanks

[@hvacworkshop4791]

Listen, this is the method that how Genteq make their tester. If you really want to know more details, you need to ask Genteq tech team. 😀

[@edilsonserafim4784]

I am getting 41 error I checked the blower motor sending 24v and it ran fine but I am not getting 24v out of the board on the connector wire color green and blue while cooling for blower to run would that be bad board? than you very much

[@monroekunz1331]

Over 40 years hvac experience have ecm motor that worked properly now runs backwards is motor shot never seen this before. Reversed former connection's no change replaced former with 75va no change runs fine in reverse. Is there a solution or should I replace motor

[@lancerudy9934]

Very nice video. Learn lots from your videos . Thanks

[@acservicetechchannel]

Thanks a lot Lance!

[@otrotland5377]

thank you, I am trying to get the blower motor w/cage to work by themselves in a greenhouse, any ideas

[@gerrychoi5769]

I think this video already answered your question. You may also get a PSC motor which is cheaper but may use more electricity

[@johnfilardi]

I have an ice motor , using Ahu with hot water coil, fan goes to tun and motor rocks back n forth, don’t have the tech mate Your thoughts

[@johncasale2195]

Excellent description

[@obedb093]

how do you troubleshoot a power choke? looks like a transformer with 2 wires.

[@handymanbrian8269]

would any damage be caused by NOT hooking up the Choke to the motor?

[@cjoakman7715]

What does it mean if you replace a bad thermistor and it runs, but pulses fast to slow to fast, etc?

[@alfonsobenitez8574]

I bought the tester that you using and another for 16 pin. Since i only have my right arm, i didn't want to use the wires. I could, but i rather use the testers.

[@baseif6472]

hey this is great info... but my motor has different connections. guess it may not be an ECM. essentially connections are Line Ground Neutral Common and Speed and Aux Heat. i am trying to test the blower as it comes on intermittently.... maybe 50 percent of time after having everything powered off for 30minutes. to try to use your testing method of power just the fan... i am trying to determine what the Rx would be. my Rx from thermostat goes to transformer where Brown(Common) gets 24v. the motor is a BroadOcean (in a Carrier blower unit). any guidance or another posting that provides such guidance?

[@acservicetechchannel]

Look up "acservicetech blower motor troubleshooting for more motors" Thanks and ask a question after you find the right one and if you don't understand, thanks

[@acservicetechchannel]

Testing of blower motors should always be done in a safe manner with the power off when possible due to amperage, thanks

[@Brandon-to9vp]

You probably have a bad limit or time delay relay, how old is the system

[@hmedwards3]

Did you measure the output voltage from the TechMatePro ? I saw on one of the HVAC blogs, where connecting a 9 Volt battery to the control leads would run the motor at half speed.

[@acservicetechchannel]

The output from the tecmate is only 24v. That tool is what is recommended from Genteq themselves. If you were to measure dc millivolts then you would need the manufacturer's troubleshooting guide to see exactly what the sequence of numbers would be thanks

[@markhoffmann5941]

@@acservicetechchannel ​... so the tech mate pro sends 24 volts AC to the motor module to test but the OEM circuit board sends DC Milli Volts to communicate.... ??? so 24 volts AC will not damage the module electronics????

[@markhoffmann5941]

never mind. the next part of your video answered my question ? :)

[@mikeoldani7252]

Im having an issue with my blower only running on a low speed (freezing up the ac line outside) The errors I am getting indicate restricted airflow. All vents are open, filters are clean and unit has been working prior to this issue. I used your method and the blower kicks on and runs at high speed as it should. After hooking everything back as it was i started it again and the blower ran a little higher then before for about 30 seconds and then dropped back to low speed. Does this mean the ECM is not my issue?

[@russellperry2303]

I have a 230v Payne air handler with a ECM blower motor when I disconnect the two low voltage wires the blue and white and plug my disconnect the fan automatically starts running and will not turn off would you think this is a defect in the blower motor

[@acservicetechchannel]

If it is not receiving a 24v signal and is running then the module on the motor is bad, thanks!

[@alexgmob85]

What do you think it means, when giving it the 24volt signal, the motor Runs but shuts down after It reaches full speed? Thanks

[@cryptoidmonkey3985]

Mine does that also. Replaced the motor with a new one, same thing happens. Let me know if you figure this out.

[@luiselizalde6757]

Excellent video thanks teacher.

[@acservicetechchannel]

Thanks Luis!

[@boogerhead0]

Wondering why you mention "microvolts" without stating the voltage range and whether AC or DC, and if DC, then which polarity is required? Or PWM, or whatever. 0.001V, as 1 millivolt 1mV, and 0.000001V is one microvolt, 1 uV

[@ib1r.41]

If this type motor fluatuates in speed, then after a minute or 2 runs consistently, then it is possible that the module is bad? Or adjusting to static pressure? Replaced 1 a year ago, but new is been doing this for a few months now.

[@cjoakman7715]

Did you find your answer to this pulsing problem? I replaced my thermistor and it "pulses" or fluctuates in speed as you said.

[@gilberttoro3069]

Hello service tech i just want to thank you for all your great videos they had helped me alot i am a apprentice can you do a video about enthalpy sensor and economizer please.

[@acservicetechchannel]

Gilbert, thanks for letting me know what you would like to see!

[@donnierobertson3088]

Great job and video like always

[@EnjoyCalculus]

Im still not understanding what the other 2 low voltage wires do (the yellow and the orange)

[@hvacworkshop4791]

For quick trouble-shooting you don't need to know. They are for control board to communicate with the motor. If you are a developer you will know that.

[@montezshackelford5043]

I went to look at a emc motor and I am getting 24 volts and primary voltage to ecm motor module but motor is not turning on. What could be the issue?

[@hvacworkshop4791]

Either thermistor or other component, just replace it if you don't know. At least you know the board might be good

[@PhuongHoang-kl5ui]

Can we use psc motor on variable speed on both ac and furnace ? If yes how do we isolate heat and cool when thermostat calls

[@acservicetechchannel]

Only on single speed furnaces and air conditioners. Make sure to verify proper temp rise in heat mode and low side sat temp in cooling mode. You can use two 12 amp fan relays, thanks

[@PhuongHoang-kl5ui]

acservicetech thank you

[@MikeSmith-og5mg]

That was a good video!

[@acservicetechchannel]

Thanks Mike!

[@tenkara1309]

Great video, I really needed that.

[@acservicetechchannel]

Thanks Tenkara 1!

[@xrayneoo]

You can also know if your board is bad if your fan motor is operational. Two bird one tool.

[@acservicetechchannel]

Absolutely xrayneoo!

[@camiloovalle2069]

Great Video 👍🏼🙌🏽🙌🏽🙌🏽

[@acservicetechchannel]

Thanks Camilo!

[@ryanmatthew275]

I had used one of those to test a motor, and the motor started. The motor was getting high voltage, and since it wouldn’t start up, and started with the tested I said the board was failing to send signal to start up the motor. Called the manufacturer after and they said I needed to test dc voltage for the speeds, once I did that they said the motor was getting signal. The module was bad not the board, can’t really trust the tested now

[@hvacworkshop4791]

So Genteq tricked us

[@bryantaylor9760]

I’ve experienced the same with this particular tester

[@robertpalmatier2699]

Sell them a new board and a motor and call it good. Can't miss. In and out onto the next call. Easy peezy. Extra parts sale.

[@ljm101101]

Could you just use and old 24v clip off and old motor and put alligator clips on it ?

[@acservicetechchannel]

Sure, that would be nice and simple!

[@anzeusnarine247]

Thanks for your important video and explanation 👍

[@acservicetechchannel]

Glad it was helpful!

[@hangngoaigiare]

what about checking signal for variable speed?

[@hvacworkshop4791]

Genteq ECM tester doesn't have that function. Unless you want to figure that out yourself 😀

[@seek3n]

Does that work with all ecm motor or just Lennox?

[@MrJwinne]

Outstanding as usual ! Do you do any hydronic Work ?

[@acservicetechchannel]

Here are some boiler related videos, thanks- kzbin.info/www/bejne/inLFnKFqfdKZj6M

[@hvacguy11]

If the ecm is bad would the motor still turn in with the tech mate attached

[@acservicetechchannel]

If the module is bad, then the tec mate pro will not be able to turn the motor on, thanks!

[@vegaslowblower8781]

@@acservicetechchannel What if ecm is good and motor is bad? How do you know if its ecm or motor

[@mikeinocencio9516]

Yes thanks bro I learned something new. Thanks

[@edlauren9434]

I like your videos and I watch it. However, I am not sure that I like these ECM motors and I replace these with PSC motors where it is possible.

[@purplegold714]

Great video!

[@acservicetechchannel]

Thanks Fernando!

[@TheBeastofBrianWilliams]

What if it’s receiving power it’s just running at slow speed 24/7

[@TheBeastofBrianWilliams]

But on heat cycle the speed is high

[@boogerhead0]

Another thing I'd like to know is why you don't just momentarily power up the motor, no cage rotor, to show if the motor works or not. Just a simple on, run for 1 sec, off. Why not show that for the ECM 3, ECM 2.3, and ECM 2.5?

[@bnicholasvideo]

I've been watching a lot of videos on this particular blower motor and this was one of the more informative ones by far! I have a question I was hoping you can help me with? Is there a way to use this blower motor WITHOUT the board? I'm trying to use this blower motor in a woodshop air filter I've built. I'm looking for a basic on/off switch? Being able to select different speeds would be nice but I'd take being able to just turn it off/on. Suggestions? Please help! Thank you!

[@acservicetechchannel]

Hey Brian, it would be better to do with an ecm x-13 motor but if this is what you have then I would just have one switch to power the 120v to feed the motor and another to power a 24v transformer that would power the same two taps on the motor. This motor has 24v testing terminals as shown, thanks

[@bnicholasvideo]

@@acservicetechchannel Thank you so much for the reply! When you say it would power the same two tabs on the motor, do you mean the 24 volts would only be tapped into those C & R tabs? Just wanted to be sure we're on the same page.

[@bnicholasvideo]

@@acservicetechchannel Also does it matter if the switch is before or after the transformer?

[@jasonclements1978]

The 24vac will power the 24vdc?

[@acservicetechchannel]

The manufacturer allows for the 24vac to signal the motor to turn on at the test taps described in the video even though the motor is controlled with dc voltage signals, thanks!

[@justdissin7340]

Is there a way to replace a ecm motor to a standard blower motor?

[@acservicetechchannel]

Yes you could use 24v contactor turning on and off the blower motor for an air handler, thanks!

[@justdissin7340]

@@acservicetechchannel how about a central air unit?is it that same or do you need relays

[@dcrams16]

Great video

[@acservicetechchannel]

Thanks Dave C!

[@argtejada6250]

Couldd you change rotation ccw to cw

[@acrepairnearme]

Cool, thank you 🙏🏻

[@acservicetechchannel]

Thanks Tapch MC!

[@PaulHVAC1]

Good Job !

[@acservicetechchannel]

Thanks Paul!

[@iluomodiaciaio2012]

Excellent!

[@acservicetechchannel]

Thanks Martin!

[@filibertoleyva5312]

Good bro.

[@geojor]

thanks for this ...

[@acservicetechchannel]

Thanks Pei Broker!

[@JohnSmith-xq9we]

A recommendation... Please get yourself a small pointer. In many of your videos you point to something thats clear in your mind but your actually pointing at two or three different things.

[@mychoclabwinston]

I feel horrible for people that have VS, and it failed after the warranty, basically, do you want to buy a new furnace, motor is close to 50 percent of a new furnace, York would be 70%, as a tech, it doesn’t make my day, ran into one today, customer called me at 6 am, no heat, middle of the night he thought he smelt an electrical smell, got there at 10am, after moving a couple maintenances around, sure enough, module failed, I do not replace the module without the motor, when out of warranty.

[@5822huron]

But how do you know if module is bad?

[@acservicetechchannel]

The tecmate pro would help the diagnosis. If the tecmate turns the motor on and there is not a fluctuation up and down and up and down again in speed then the motor is good. If the motor does not turn on, then you check the resistance readings on the motor itself detached from the module along with a check from windings to ground. If the motor is good then the module is bad. I have the tecmate pro linked at www.amazon.com/shop/acservicetech thanks

[@pollydor07]

Thanks

[@acservicetechchannel]

Thanks Sang!

[@stephwaylonwells3218]

👍

[@Oscarbm1234]

First

[@acservicetechchannel]

Yup, thanks

[@peskeyplumber]

i hate the future bro

[@robertsaathoff9481]

What if the motor is on bottom and you can’t even see the connection, dumb

[@vegaslowblower8781]

So does this test just the ecm or motor or both? how do you know if its just the ecm or just the motor