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I agree, inducer motor. trane makes a relay kit for this, check with your local dealer for the info. they recommend you replace the motor as well.

We post this stuff in the Pro forum.

Start a thread in the pro commercial forum and call it "Trane inducer bulletin?" and someone will post it.

The expiration of a bulletin means you get no free motor, no free kit.

It means Trane expects the customer to now eat the cost of their defective parts.

I know this Is an old thread but can someone Email me the service bulletins you guys are talking about for the YCD units?
I just finished cleaning up a 460v transformer mess on a YCD and found two more units on the roof that had Inducers running with no call for heat. Both units IGN boards had burnt contacts visible through the clear relay. I would have never thought about the IDM wires shorting together and causing the motor to continue to run.
Thank you for this post

I got copy of bulletin I could post if anyone wants it. Or should this be done in pro forum?

Sent from my BlackBerry using Tapatalk please excuse typographical errors

I had to replace three combustion blower assemblies in the last two months. The motors were shorted and running all the time. Another Tech just replaced one the other day at one of my accounts and none of them came with a wire harness and isolation contactor for HI and LO speeds. I was at Trane today and asked them about the service bulletin, they gave me a copy of it but didn't want to talk about it. I asked if they would replace the motors under warranty and he said I could try to. I asked why the new motors didn't come with the wire harness and isolation contactor and he said you have to ask for it. But if you didn't know about the service bulletin they weren't going to tell you.

expiration dates do not make any difference. they are for the manufacturer only. on some service bulletins, the experation date is for warranty claims only. but in every case, the problem still may exist and needs to be addressed.

Originally Posted by rundawg

Until then, most guys will put an email address in their profile. Do you hear my foot stomping?

X2

Originally Posted by tech master

WHAT bullitin and where? some of u guys keep saying about bullitins and that they expired...where can i see them?on this site?thanks

Glad you got it resolved.

Get your post count up to 15 and apply for pro membership. Lots of things are revealed behind closed doors in the "PRO" Forums.

Until then, most guys will put an email address in their profile. Do you hear my foot stomping?

hey the problem was the inducer motor, high speed switch was stuck closed.ended up also replacing the control board cause the relay on it had burn marks just like 2sac said,replaced it to avoid future service calls.unit is running like a champ.one question cause im new to this site.WHAT bullitin and where? some of u guys keep saying about bullitins and that they expired...where can i see them?on this site?thanks

I guess every knows that the Inducer Fan Motor is giving him a problem right now and it needs to be replaced with a new OEM motor.

But that is not a complete repair. Again this unit has a major issue per the Trane Service Bulletin which specifically address a complete upgrade to prevent total malfunction of ALL the controls and related switches and contactors.

Its not a big deal but if the upgrade has not been performed it is certain that he will have major problems with the remaining controls when the motor fails. There are no safety's in place which will prevent this failure and its highly possible that a fire can develop with in the controls cabinet.

So.....The kit is available which is to alter the existing control sequence of the inducer fan motor. It includes wire harness and isolation contactor for HI and LO speeds.

To understand it better he will have to read the service bulletin. I have one somewhere but for now here is the repair kit Lit No. which he needs to get for the repair.

The Combustion Fan Motor Lit: RT-SVN17A-EN Dated February 20011


__________________________________________________ _____________________________
Troubleshooting is not part of the repair...understand the symptoms and you will find a solution.

Inducer motor! and it aint cheap.

It's the inducer motor. First saw the problem got to be close to 8 years ago or so. Double check the relay on the ICB for burn marks, replace if necessary and don't forget to clean the burner screen. It should be plugged with cottonwood.

I'm on the "inducer needs to be replaced" bandwagon. Seen this a few times. If you do a search on here you'll see a ton of threads about this.

Im gonna N00B it up
What does it matter if the bulletin is exspired it still tells you the problem and needed test to fix it. I am geussing that the manf will not pay to fix it is what that means?

How do you get to see all these bulletins for RTU? You have to be a dealer of the manf right?

someone is not a master with the Trane YCD model.

the windings will short which makes the motor run continuous. There is a bulletin for this. you unplug hi and low from the board. if motor still runs then its the motor.

i had one also the other day.

Originally Posted by tech master

hey alcomech,what do u think the problem is?the induced motor keeps running after t-stat is set on off.u think its the ignition board?thats what gives power to the motor?

No, bud. There are many issues with this its the inducer fan motor. I just replaced on last Friday, which would make about the 100th one. Easy test, pull the wires for high and low off the board, it still runs.

Again there is a bulletin for it but it has expired

induced motor

Originally Posted by tech master

Hi, i was wondering if someone can shine some light on a problem im having with trane rtu unit.im new to hvac talk.model ycd240b3hajb. the induced motor is running continouasly even when t-stat is off.on a call for heat it goes throu the whole cycle and heat comes on.when it satisfies,or when u turn off heat on t-stat everything cycles off but the induced fan motor continues to run.im thinking its the ignition control board that needs to be replaced but want to confirm before i start replacing parts.could it also be the induced motor thats defective causeing it not to shut down?maybe internal switch is stuck closed in motor. any suggestions? thanks

hey alcomech,what do u think the problem is?the induced motor keeps running after t-stat is set on off.u think its the ignition board?thats what gives power to the motor?

Originally Posted by rundawg

There was a service bulletin on this that said the motor windings may fail internally and allow the motor to run without a call for heat.

What is the serial number sequence ?

Hey Rundawg, I have a job where i got 22 YCD300B4HAHB and have personally witnessed this problem. Before there was a bulletin on this, we had one unit catch on fire and we could not figure out what happened. It ended up that ALL the controls had to be replaced. It started with a bad inducer motor which shorted every control in the unit. The 460 volt transformer caught on fire. It was a mess.

It ended up after watching the other units run that the 2-speed inducer motor would short out what appeared to be between the windings of LO and HI speed. It would work fine in LO speed but when the 2nd stage of heat would come and energize the HI speed the motor would burn the windings. If you did not catch it in time the motor would short the winding and some how send line voltage back through the low voltage side (probably through the IGN Board) and fry EVERYTHING.

I think it is originally caused by a bad Run capacitor which in my case are 5 MFD / 440 Volt. And if left unnoticed the motor windings get hot when the run cap is less than 10% of it's rating.

As for the Bulletin I think Southern Mech is right that it may have expired. But this definitely must be fixed. There is a kit complete with all new wire harness, and an isolation contactor which will lock out HI/LO inducer speed or windings .

Originally Posted by tech master

serial number 346100457d. i dont think its the induced drft motor.if windings were bad motor wouldnt run at all.

Not necessarily true. This bulletin states just that.

Your serial number falls within the sequence of numbers for this bulletin, even if the bulletin has expired.

serial number 346100457d. i dont think its the induced drft motor.if windings were bad motor wouldnt run at all.