Furnace BLOWER FAN Motor WON'T SHUT OFF! 6 Reasons Why the FAN KEEPS RUNNING!

[@edbouhl3100]

Excellent! As a homeowner, I wish that I could always count on service specialists like this when I need assistance. Unfortunately I’ve found that often I need to know the specialist’s job as well as he does to make sure the work is done correctly. Usually too, I’ll have the specialist pull a city permit for the job so they know their work is being checked.

[@Mike__B]

Unfortunately service "specialists" more often than not, just pick one (expensive) part to replace and claim that is the reason.

[@edlauren9434]

I am a licensed contractor with some experience.. But, I still watch your videos because I am not a native English speaker and I am learning professional/communication language while driving from one site to another. And yes, pretty much every video I learn something new from you in sense of the trade skills. Thank you for doing this videos for us!

[@bretthargis6802]

I speak English. Wish I didn't some times. Especially with customers

[@acservicetechchannel]

So awesome to hear! Thank you for your note Ed!

[@robmilkiewicz]

I just want to say thank you. I frequently watch your videos for training and you really know your stuff. I’m less than a year into the trade and have shifted from a career in the automotive business to HVAC/plumbing working for my family’s business. After a summer of A/C and now I’m in the height of heating season I’ve been exposed to enough to appreciate the wealth of knowledge you have and strive to become a true technician like you. Not just a parts replacer. You’re ability to explain and prove operation and failure is unmatched. Thank you for passing on you’re knowledge and educating us in the trade.

[@acservicetechchannel]

Thank you so much for your note Rob! It is very encouraging to me!

[@ChrisMeuir]

Hc

[@BartSimpson-nr1dy]

Great electrical diagnostic demonstration. Some if not most technicians suffer in the electrical diagnostic side of their job.

[@bretthargis6802]

That's that truth lol fluke is your friend

[@acservicetechchannel]

I am glad that these videos are helping with diagnosis then, thanks!

[@markspott1741]

The information you share and your illustrations are done so well! Thanks so much!

[@shawnlatif1369]

You are a great teacher with an excellent personality. Thank you so much.

[@rchrdschmidt]

So far, this is a well-designed video. 😊

[@jamescollins8148]

Your instructional videos are the best! Thank You. One question; why would an open safety cause the fan to run? The open sensors should remove the power?? I know the T stat, t stat wiring or the welded relay would cause such issue. If the Tstat is off position the fan should not run regardless. Correct? Thank You again You are the best!

[@harryschrysan3183]

When any kind of temperature limit switch opens it breaks power to the board that controls the gas valve stopping the furnace from firing and at the same time it tells the board to keep the fun on in order to cool down the furnace. If your switch is stuck open the board will think that the system is overheated and it will not turn on,while keeping the blower running.

[@jamescollins8148]

Thank You! I totally forgot the board no/ nc relays.

[@harryschrysan3183]

@@jamescollins8148 No problem, happy hvacing 😂

[@GLG_Corp]

Here is a 7th one but probably not that common - but it happened to me. When they constructed my home they ran three sets of wires to the control board. One multi wire from the thermostat location, and two other separate two wire cables to ??? (they just go into the wall. Possibly one was to go to a fan switch (a switch that would turn the fan on bypassing thermostat) and possibly the other was for condenser control for future air conditioning. Our home does have a fan control switch, but it is wired directly to the fan not the control board. For whatever reason, the installation contractor connected both extra two wire cables to the control board, wiring red to R and the black wire to G. The other ends were not connected to anything, so it didn't matter. Recently we had a really hot spell and turned the fan control on to try to circulate the cool air from the basement - left it on for several weeks. When we turned it off - the fan stayed on. The culprit was one pair of the extra wires. After 20 years of vibration a short was created between red and black. I isolated which pair and spent some time wondering if it was possible it was connected to some other device that would try to turn on the fan. Once I determined it wasn't, I disconnected that pair from the control board. Everything works, thermostat fan on, fan control, heating, and cooling.

[@chriscermak3188]

Great video again Craig. Would love video on 2 stage scrolls and how the electrical works. Thanks Chris

[@acservicetechchannel]

Thanks for letting me know what you would like to see Chris!

[@BlackjackK7X]

I have an ECM/Control board. Fan blower blows non stop, but will cut off if I pull the single wire off the control board from the X13 SPD post. Does that sound like it's a bad board?

[@melchezidekmuhammad1413]

Gratitude .. your shared knowledge is spot on, right & exact. My problem solved!

[@coldfinger459sub0]

That was the best all in one description for continuous blower run I have ever seen.

[@acservicetechchannel]

Thank you so much!

[@thesilentonevictor]

Just a question do you teach hvacr as well 🤔 your knowledge and skill set is of high standards 🇱🇨 🇱🇨

[@acservicetechchannel]

Yes I am a licensed teacher of HVACR and Building Maintenance in the state of NJ and taught at our local technical school for years, thanks!

[@magnito9811]

hi thank u for this amazing content! i don’t understand why u had the red probe on one terminal and checking for voltage with the black prope. i know this a silly question i’m new into the trade and want to have a deep understanding of electricity can you please elaborate more on this topic

[@thesilentonevictor]

Great training video

[@acservicetechchannel]

Thanks a lot!

[@leftyarrow7981]

I have this problem with a coleman presidential furnace. I did remove the thermostat and the blower motor cuts off. The only difference is my thermostat switch is set to heat. Does that make a difference when troubleshooting a potential faulty thermostat ?

[@brendareese7534]

Very informative. Think I just bought a motor but may not have been the problem

[@miguellozano8936]

Any recommendations to replace the 2.3 ecm controller on a York RTU with something a little better or more cost efficient.

[@jimmysegovia2688]

awesome Craig!!!! thank you for sharing.

[@acservicetechchannel]

Thanks Jimmy!

[@patbrock7460]

I'm sure 95% know but for the 5% that don't , sometimes you want the blower to run all the time. When you have a multi floor house ( 2 story or more) you get what's called a waterfall effect where in the off cycle the warm air raise to the upper floor and the clod air falls to the lower floor. I had a raised ranch and would get a 8 degree difference between floors by turning the fan to continues run that cut the difference to 4 Degree. So, during the winter and AC season my fan ran 24/7 ,

[@acservicetechchannel]

Thank you for posting the note for others to see Pat!

[@beanieweenie9543]

I was literally just fixing to ask this question. I just moved in a 2 story house. The upstairs has a thermostat and the downstairs has one, when my heater is turned on but I have thermostat set lower than the room temp so the heater won’t come on I noticed the fan still cycles on and off through out the day even though the room temp is still higher than what the thermostat is set at. The heater is not kicking it seems to just be the fan. Is this the the scenario you are talking about? Is this normal or do I need to call for service? Thanks

[@patbrock7460]

Well I suppose the upper stat could be used to turn on the fan only? See if the upper stat has an " ON " position , the idea is to have the fan run all the time to over come the cold air falling to the lower floor and the hot air raising to the upper floors.@@beanieweenie9543

[@kenfawcett4006]

If the house has programmable thermostats like Nest you can go into them and clear the schedule if you haven't done so already.@@beanieweenie9543

[@davidskipperskip5403]

Excellent, thank you

[@acservicetechchannel]

Glad to help David!

[@Ait-q8q]

Another great video my friend

[@acservicetechchannel]

Thank you so much!

[@EquallyContradictory]

Question. What if the blower motor turns s on and off with the call for heat but the fan switch on the thermostat doesn't work. I have a goodman GM9S800 furnace and it's brand new. The furnace never enters into the sequence of operations

[@petesingh292]

When checking the voltage of any switch you should read 0volts that means the switch is closed and if the switch is open you should get voltage reading . Plz correct me if I am wrong, thanks

[@droskiwayad3767]

You are very much wrong in HVAC applications, also note how his probes were set up, 1 probe to Common which essentially is a ground and the other to each side of switch that is wired in series. Hope that helps.

[@andoniades]

You're correct when checking voltage. The positive lead goes to the power, negative to ground, get your voltage reading (if set properly). But when checking for resistance, you should get 0 Ohms when checking both sides of a wire to see if its good. ...or if a switch is closed. If he said voltage while checking for resistance, or vice/verse, he probably just misspoke.

[@timmygolden4461]

I have a similar problem with my ac unit. I have a Lennox and when I turn the ac unit on upstairs the fan blower keeps running so I have to go up in the attic and remove the breaker.

[@lancelawrence3259]

Nice video

[@acservicetechchannel]

Thanks Lance!

[@davidlopan6649]

Do they have a techmate pro for X13 motors?

[@acservicetechchannel]

No, we just normal measure if it has the appropriate 24v signal and if the motor is blowing, thanks!

[@roguemechanical8420]

Great video! I have a copy of your AC Service Tech book and the work book. Could you point me in the direction of a great HVAC Electrical book?

[@acservicetechchannel]

You could check out ESCO Institute's books, and thanks!

[@bobby_summerfield]

Excellent Video Thank You

[@harkamagar201]

how does the safety limit switch cause the blower to run contineously please explain us ? thank you

[@donaldpainter956]

On some of the older furnaces if the switch goes bad it gives the board the same signal it gets when the unit is running so the board thinks it's burning and the fan will run I haven't seen it happen on the newer furnaces and like on the wall furnaces their switchs are 120 volt not 24 like on the regular gaspack and forced air furnace

[@sonnyj7731]

I have a amana aspt42d14aa that thr blower motor stayed running, a/c guy comes put diags ecm bad on blower moyor, a/c unit had been installed about 6 years, replaced motor. A year later same thing, replaced motor, now approc a yr n a half later same thing. Any idea on why the blower motors ecm keeps going out causing this issue? Frustrating that it has started doing this

[@miked9000]

With my electric heat only furnace- tech came out, said it was the main board. Ok, changed it. Now, the fan runs regardles of the thermostat, but the thermostat will turn the heat on and off, just not the motor. So i figure it must be a relay, but not only i cannot find a part #, even with the model, and serial #, i have to disassemble the entire wiring harnes, breakers and all, just to get to the relay. Why? It is in my wet crawl space, that has no more than 12 inches of clearance.

[@israelllanas4909]

Thanks for sharing

[@acservicetechchannel]

Thanks for watching!

[@WeManageUcom]

I am using a white-rogers 50A55-843..5 months old .When Heating the Fan shuts off after 90 seconds...when cooling the fan does not shut off...can anyone give me a place to start looking or testing?

[@acrepairnearme]

Thank you for the video. I have a question. Will the power cut off when I pop the door switch reset 3 hours lockout on the control board? I have a situation where the flame rollout switch was open and the board was throwing error 13. But even after I reset the flame rollout switch and put the power back to the board nothing was happening when I initiate a call for heat R+W. The board was making some hissing noise and didn't start the sequence for the heat call. I ended up replacing the board because I thought the power interruption must clear the memory on the board. Am I right?

[@acservicetechchannel]

Yes power interruption should always clear the furnace to allow operation if all safeties are reset. Otherwise the board may be bad. Make sure to check for CO levels and to see why the flame rollout tripped. Flame rollouts trip due to cracked heat exchanger or possible clogged heat exchanger. Thanks again for your support on Patreon!

[@acrepairnearme]

@@acservicetechchannel thank you for the response. Sure. I always check for CO and make sure the CO alarms are presented and working. Safety is the first.

[@bretthargis6802]

Once you introduce the ECM I'd say we have more than 6 possibilities

[@bretthargis6802]

Still a great tutorial with lots of information

[@acservicetechchannel]

Ha ha, yeah they aren't as straight forward as the PSC ones. It depends on what model you have, thanks!

[@ehabfathy8]

جددظعت والتفنن ننمد نمط من ت٢وننزوو ون

[@MaMa-qh4dy]

Those 2.3 ECM modules are overly sensitive causing failure. Just be sure that you have sufficient airflow in heat mode, otherwise, you will fry the module over time. Remove those overly-restrictive filters!!!!! I also install surge suppression just in case.

[@logicalrat]

Is it heat or the airflow restriction itself? Ive always heard ecm motors are sensitive to airflow restrictions, but heat makes sense too

[@MaMa-qh4dy]

@@logicalrat To compensate for airflow restriction (i.e., too high MERV filter or too many in-line air filters), the ECM will allow more Amps to speed up the motor so it matches the airflow settings on the dip switches. The increased heat generated inside the module and/or the motor can burn out the module. There is a disc-shaped thermister in the module some people replace (solder in) rather than replacing the module.

[@acservicetechchannel]

Great tips Ma Ma!!!

[@GodisAgapelove4172]

If the blower doesn’t go off will this effect my light bill? Or will it cause further damage?

[@derek7063]

No your light bill will not change. Because the light bill is only for your lights, and you have a separate bill for the rest of the electricity. And also your blower is powered by coal.

[@GodisAgapelove4172]

@ Thank you ❤️

[@avinashdesai0206]

3 switch flame roll out Lower pressure LP

[@jackbrennan8476]

Good video learned a lot

[@divit57]

My fan continues to run after the A/C cuts off. If I flip the breaker off and back on, the fan stays off until the A/C starts again. Then it's always on again. This means its not the wiring correct? What most likely is it?

[@mushtaqmalik8292]

Thank you so much great video!

[@acservicetechchannel]

Thanks a lot for your note!

[@pl747]

So if you disconnect the control circuit from a ecm motor it should turn off?

[@coryk.9025]

My heater will reach temperature, then heat will turn off (can hear little click) but fan keeps blowing slightly cooler air. Sometimes it shuts the fan off and sometimes it doesn’t, or runs for 30 minutes then shuts off. I don’t know what the heck is going on. I have a Heatrix by Dell HXOB, central air, any tips

[@jesselopez1637]

Have same problem did find out what it was

[@coryk.9025]

@@jesselopez1637 I disconnected the thermostat, just took the faceplate off and put it back on, and seems to work fine for now,

[@coryk.9025]

@@jesselopez1637 I replaced the thermostat with a Hunter as the og thermostat lcd screen faded fyi. Might have to replace the thermostat again soon.

[@Bruce_Wayne35]

The thermally-activated limit switch could be getting flaky and erratic. I have the same problem. If I tap the box where the limit switch is located, the fan will turn off.

[@stevecooper3579]

thanks

[@kabalbasisla1871]

Sir I have a question how to convert lra 196 in tons 3phase

[@kenthomas4668]

I cheat! I use an old contactor off an ac unit and attach two leads to it. I put one at "c" and use the other the same way as you would an electrical meter probe. Two reasons 1) I don't need to keep looking at the meter as I can here the loud clicking noise. Works great in dark and difficult to get at furnaces. 2) In rare circumstances you can read 24V but due to a weak spot in wires it does not have enough under load volts to get the job done. The relay will chatter or not pull in. I find it much faster as I just move right through the whole circuit in seconds.

[@acservicetechchannel]

Thanks for sharing Ken!

[@benchurch1309]

I get a 13 error code my fan blower stays on and my inducer motor doesnt come on when calling for heat?

[@Al-mu4ff]

How about an electrical furnace?

[@no9saint84]

Rollout switch or limit switch 9 times out of 10

[@acservicetechchannel]

Yes often!

[@elvisalberto5766]

I see the green wire and the blue wire connected to each other

[@acservicetechchannel]

24v common connects to ground in furnaces and air handlers, thanks!

[@elvisalberto5766]

@@acservicetechchannel I learn something new thanks

[@Datacorrupter234]

our rheem blower motor keeps failing the motors generally only last 1-2 years before they fail we have had a tech come out and they said generally the fan cant be ran for more than a few hours without doing damage. what a pile of crap

[@UltraHydrophobiccoat]

ECM motor saves money? Hmm, they are way more expensive than the PSC motor. Some ECM motors are failed within 3 years

[@acservicetechchannel]

Yeah cost can out way electrical efficiency, thanks!

[@chesstime356]

I like it too…

[@acservicetechchannel]

Thanks a lot!

[@workphone4210]

REAL REASON! THEY MAKE THEM THAT WAY ON PURPOSE SO U WILL HAVE TO PAY MORE ELECTRIC BILL!!! SORRY ALL CAPS CAN'T C SMALL LETTERS ON KEYBOARD

[@KeeperOfThe10]

This is what I suspect too because all of a sudden the blower is running a lot longer. I changed the thermostat bc I thought that was the problem. But this newer one just blows and blows cool air no matter the setting. Oh, it stops for a second then starts back up again. I believe something was tripped... on purpose. 🤔🧐😏

[@workphone4210]

@@KeeperOfThe10 I ALSO BELIEVE THE ELECTRIC SMART METER R ABLE TO SPEED UP VIA REMOTE SIGNAL FROM SATALITE. DID U C HOW THEY CUT THE POWER OF 10 OF THOUSANDS N CALIFORNIA ON & OFF VIA SMART METER AT THE SAME TIME. I BELIEVE THESE POWER OUTAGES R ON PURPOSE TO FEED MORE POWER TO THE C.E.R.N PARTICAL FUSION COLIDER UNDERGROUND N CALIFORNIA. SORRY ALL CAPS CAN'T C SMALL LETTERS ON KEYBOARD

[@porcelinaofthevastoceans3903]

So you are implying the private company that manufactures your furnace or the private company that installed it is somehow colluding with the energy company in your state and receiving a kickback? That would be what you have to be implying here. And of course you know that makes zero sense. It isn't supposed to function that way, so something is wrong and that's the point of the video. 😩

[@workphone4210]

@@porcelinaofthevastoceans3903 IM N9T SURE IF U R RESPONDING TO MY WORKPHONENUMBER RESPONCE OR THE VIDEOS BUT IT SENT ME UR RESPONCE. CONFIRM EITHER & ILL RESPOND TO UR KICKBACK STATEMENT. WHICH DIDN'T IMPLY AT ALL. SORRY ALL CAPS CAN'T C SMALL LETTERS ON KEYBOARD THAT WELL

[@hyu8826]

​@@porcelinaofthevastoceans3903no. We are dealing with this problem right now. We had our scheduled "service maintenance" with a big local company that was just supposed to replace the filter. He told my wife we were wasting electricity because it should have a fan setting to 10 minutes. Now instead of heat, the blower fan is continuously running. I am watching this video to find the shut off right now. You can have honest technicians. You can also have POS guys trying to break something in an older unit to sell you something far more expensive. Same in plumbing. I bought a wall ionizing unit for $2000 when I was a lot younger because I mistaked professional with honesty a long time ago. I don't make those mistakes anymore

[@logicalrat]

Reason #7 - the supply house doesnt program the ECM motor

[@acservicetechchannel]

Certainly another possible reason!!

[@realestateservicessaleshea99]

🍺😐👍🏻

[@acservicetechchannel]

Glad you enjoyed it!

[@wajidzaki6463]

Hi sir please give me reply I want job

[@mikebaranHVACGOD]

Bypass All Safteys, All Of Them... Problem Solved