"Mark" wrote in message
oups.com...


Well that's my concern.
There are more and more of these kinds of units being installed
everyday.
We can't "home brew" a fix for all of them.
Someone needs to get to the FCC or to the manufacterer to fix this at
the source before it gets worse.

Maybe "turn them in" to the FCC for a _finders fee_? :O)

-zero

AKS wrote:

SNIPPED


Gentlemen Hi
and there is nothing that could be done to force OEMs
for clean up this interference (RFI?) That is nice but
you and I if interfere with some one TV in Neighborhood
FCC would be all over our ass thanks for equal justice
KA2AYS



Not quite true!

I run 1KW on low bands [75 and 20 meters]. I have a tuner and low pass filters
in line. My station is properly grounded to the service panel ground/earth rod.
This connection is also the equipotential surface for the operating position.

My station meets ALL FCC requirements.

If a neighbor's tv, phone, stereo, or whatever, picks up my transmissions the
problem is with their equipment and I am NOT responsible for correcting the
situation. I will advise them regarding what needs to be done at their end and
at their expense. The best demonstration is to invite them into my station and
have them witness my tv, phone, stereo etc., being interference free.

The best demonstration is an RFI free home station.

We, hams, are not responsible for deficiencies in consumer electronics. That
rests with the manufacturer. The next time you buy a stereo read the Part 15
compliance statement!

Most likely it states, I paraphrase, this equipment MAY receive interfering
signals from near by transmitters. Buyer Beware!

/s/ DD

Dave wrote:

AKS wrote:

SNIPPED



Gentlemen Hi
and there is nothing that could be done to force OEMs
for clean up this interference (RFI?) That is nice but
you and I if interfere with some one TV in Neighborhood
FCC would be all over our ass thanks for equal justice
KA2AYS


Not quite true!

I run 1KW on low bands [75 and 20 meters]. I have a tuner and low pass
filters in line. My station is properly grounded to the service panel
ground/earth rod. This connection is also the equipotential surface for
the operating position.

My station meets ALL FCC requirements.

If a neighbor's tv, phone, stereo, or whatever, picks up my
transmissions the problem is with their equipment and I am NOT
responsible for correcting the situation. I will advise them regarding
what needs to be done at their end and at their expense. The best
demonstration is to invite them into my station and have them witness my
tv, phone, stereo etc., being interference free.

The best demonstration is an RFI free home station.

We, hams, are not responsible for deficiencies in consumer electronics.
That rests with the manufacturer. The next time you buy a stereo read
the Part 15 compliance statement!

Most likely it states, I paraphrase, this equipment MAY receive
interfering signals from near by transmitters. Buyer Beware!

/s/ DD

It should also state that the device may not emit any interfering signals.

Dave WD9BDZ

Mo Hoaner wrote:
"clifto" wrote...
Anything that generates RF inside the USA is regulated by the FCC. If your
cat's butt emits RF in the USA it's regulated by the FCC.

Wrong. If the cat's butt emits RF, it's regulated by the FCC. But, digital
equipment used only in transportation vehicles - busses, cars, aircraft -
and equipment used in appliances - HVAC equipment mentioned specifically -
are exempt from Radio Frequency Device regulations. The rule says "....are
exempt from the specific technical standards and other requirements
contained in this part. The operator of the exempted device shall be
required to stop operating the device upon a finding by the Commission or
its representative that the device is causing harmful interference".

Interesting. I've never heard that before. Thanks for the correction.

Not that that doesn't suck...

--
"A man's country is not a certain area of land, of mountains, rivers, and
woods, but it is a principle; and patriotism is loyalty to that principle."
-- George William Curtis

Got a call from a Trane rep who contacted my local distributor and
scheduled to install a shielded cable harness between the PWM control
board and the motor. The work is scheduled for Tuesday. The Trane rep
claims that they are aware of the problem and that the shielded cable
eliminates the noise. Figure I'll give it a shot and take it from
there.

By the way, MLD reported earlier that he had that done with limited
success. Hope they have improved the fix.

Ransley wrote:
If you file in small claims for the nominal fee, [mine is 35$] Do you
really think Trane will fly in an atty for a day at considerable cost
and possibly loose 3000 and make local new hurting sales, or get your
furnace fixed.
I think they will fix it within 30 days. If they see your attemps to
alter it you are screwed. Start by a certified letter and many emails to
Trane and print copies. Video your interference issues-tests.

Maybe different organizations like FTC, FCC, CPSC, Consumer Reports,
etc can guide you on other complaints. This issue is not new.

RF I would think is regulated. Excessive amounts have to be of concern
of saftey for medical, security, and other equipment. Even if Trane has
figured a legal Out with the FCC, your local judge wont like it not will
Trane want to pay to go to court .

Modelman:

Please keep me informed on this problem. I also recently had a Trane
xv90 installed and am having the same rf interference problem. The
local installer hasn't got a clue, so I phoned Trane, who is supposedly
going to contact and advise them

zibs


modelman wrote:
Got a call from a Trane rep who contacted my local distributor and
scheduled to install a shielded cable harness between the PWM control
board and the motor. The work is scheduled for Tuesday. The Trane rep
claims that they are aware of the problem and that the shielded cable
eliminates the noise. Figure I'll give it a shot and take it from
there.

By the way, MLD reported earlier that he had that done with limited
success. Hope they have improved the fix.

Modelman:

Please keep me informed on this problem. I also recently had a Trane
xv90 installed and am having the same rf interference problem. The
local installer hasn't got a clue, so I phoned Trane, who is supposedly
going to contact and advise them

zibs


modelman wrote:
Got a call from a Trane rep who contacted my local distributor and
scheduled to install a shielded cable harness between the PWM control
board and the motor. The work is scheduled for Tuesday. The Trane rep
claims that they are aware of the problem and that the shielded cable
eliminates the noise. Figure I'll give it a shot and take it from
there.

By the way, MLD reported earlier that he had that done with limited
success. Hope they have improved the fix.

"David G. Nagel" wrote in message
...
Dave wrote:
Snipped...

It should also state that the device may not emit any interfering signals.

Actually, most of the stuff being talked about here is exempted by the FCC
from testing. Basically, any digital stuff in appliances, and vehicles is
exempt from showing compliance. That doesn't mean it's allowed to cause
harmful interference, but the exact definition of "harmful" is a grey area.




Dave WD9BDZ

Mo Hoaner wrote:
"David G. Nagel" wrote in message
...

Dave wrote:

Snipped...


It should also state that the device may not emit any interfering signals.


Actually, most of the stuff being talked about here is exempted by the FCC
from testing. Basically, any digital stuff in appliances, and vehicles is
exempt from showing compliance. That doesn't mean it's allowed to cause
harmful interference, but the exact definition of "harmful" is a grey area.




Dave WD9BDZ



Exempt from FCC compliance testing but not from Part 15 compliance.
Intentional and Unintentional radiators must comply with Part 15. There
is still a permissible level of signal emitted under this Part i.e.
Unlicensed two way radios.

Dave WD9BDZ

modelman wrote:

Got a call from a Trane rep who contacted my local distributor and
scheduled to install a shielded cable harness between the PWM control
board and the motor. The work is scheduled for Tuesday. The Trane rep
claims that they are aware of the problem and that the shielded cable
eliminates the noise. Figure I'll give it a shot and take it from
there.

By the way, MLD reported earlier that he had that done with limited
success. Hope they have improved the fix.

Modelman,

I have an American Standard two stage variable speed furnace and have the
exact same problem. American Standard owns Trane and furnaces by either brand
name are exactly the same, with the exception of the first letter of the model
number and the label on the door. In other words, the Trane XV is the same as
the American Standard Comfort-R.

I'm guessing that your furnace model number begins with TUY.

I tried to have the dealer resolve the problem without success. I had
consulted with the regional distributor who claimed that there was a main
board replacement fix. The dealer replaced the board under warranty. There
was no change. For other reasons, the furnace was replaced. The new furnace,
built a year later, has the exact same problem.

My noise sounds the same as you, starts when the inducer motor starts (before
the blower fan comes on) and shuts off when the inducer fan shuts off (as soon
as the thermostat stops calling for heat.) When the inducer fan increases in
speed, the interference changes in pitch and may get louder.

The interference is enough that I can pick it up outside the house while
listening to a strong nearby Class A radio station.

I recently saw a post on www.hvac-talk.com that mentioned that Trane/American
Standard now has a fix that involves shielding the inducer fan wiring. This
may be the same thing that MLD reported and you mention above. Please report
back what you experience, I plan to call for service too very soon, while I'm
still under warranty.

While American Standard brand and Trane brand are the same, they have
different wholesale distributor networks, so if one fails to help, perhaps
asking the American Standard distributor for your region could at least have a
clue, not sure. One thing that I am sure about is that calling the
manufacturer is frustrating. At best, you just get redirected to call your
local distributor. When I was having problems with my dealer, the
manufacturer rep admitted that anyone who is locally licensed can be an
American Standard HVAC dealer, they really don't care. I believe they might
more tightly control the Trane brand dealers, but who knows.

You can try calling the manufacturer anyway at 888-556-0125. I would do this
just to register your radio interference issue, in addition to complaining to
FCC. Hopefully if enough of us do this, the problem will someday be resolved.

Mark wrote:

Hi,
Then, shielding, choking, bypassing with caps come to mind. It's all by
trial and error. O'scope may come in handy.


Well that's my concern.
There are more and more of these kinds of units being installed
everyday.
We can't "home brew" a fix for all of them.
Someone needs to get to the FCC or to the manufacterer to fix this at
the source before it gets worse.

Mark

Yup,
EMI pollution!

Motors with brushes are "incidental radiators" according to the FCC. I
believe PWM or variable frequency drive motors would be considered
"unintentional radiators" in that they intentionally generate a radio
frequency (9 kHz to 3,000,000MHz) but do not intend to radiate it. (see
definitions at http://www.hallikainen.com/FccRules/2007/15/3/).

Incidental radiators must use good engineering practice to minimize
interference (see http://www.hallikainen.com/FccRules/2007/15/13/).

Digital devices (I think motor control systems qualify as digital
devices) in appliances are exempt from the emission limits for
unintentional radiators (see
http://www.hallikainen.com/FccRules/2007/15/103/), though the user must
cease operation if the FCC finds it is causing interference.

"Noon-Air" wrote in message
. ..

"Dave" wrote in message
. ..
Noon-Air wrote:

SNIPPED

As Jake said.... with the addition of....
Make sure that you have proper earth grounds for your power, and the HAM
rigs/shack. That will go a long way towards eliminating RFI. Make sure
that all the bonding screws in the furnace are clean and tight, make
sure that the furnace has a proper ground also.
When I put the shack together, I drove a seperate 8ft copper ground rod,
and silver brazed #6 solid copper to it, then silver brazed the wire to
the copper ground buss on the back of the bench. All equipment
grounded.....no problem.

de n6ojn



As you describe your setup it does meet USA National Electrical Code.
Your home should have ONLY one earth connection, not two!

Actually as I live in a lightening prone area, my home has several earth
grounds as do most of the other buildings in the area.

As you describe it, your house presumably has the electrical service
panel grounded to an 8 feet long ground rod where the service enters the
house.

The main service panel has 2 ground rods tied to the same buss, The TV
cable entrance has a seperate earth ground, as does the telephone
entrance, and the sub panel in the garage.

You seem to have added a second 8 feet ground rod to your home
specifically for the Ham station.

Yes and that one too.

Check with a local electrician for specific compliance issues.

done did... the sparky is the one that put the extra rods in for the
service entrance and the garage sub panel, and the city inspector signed
off on it.

/s/ DD



You bonded all the grounds, eh?

"Oscar_Lives" wrote in message
news:UKS5h.278091$1i1.256793@attbi_s72...

"Noon-Air" wrote in message
. ..

"Dave" wrote in message
. ..
Noon-Air wrote:

SNIPPED

As Jake said.... with the addition of....
Make sure that you have proper earth grounds for your power, and the
HAM rigs/shack. That will go a long way towards eliminating RFI. Make
sure that all the bonding screws in the furnace are clean and tight,
make sure that the furnace has a proper ground also.
When I put the shack together, I drove a seperate 8ft copper ground
rod, and silver brazed #6 solid copper to it, then silver brazed the
wire to the copper ground buss on the back of the bench. All equipment
grounded.....no problem.

de n6ojn



As you describe your setup it does meet USA National Electrical Code.
Your home should have ONLY one earth connection, not two!

Actually as I live in a lightening prone area, my home has several earth
grounds as do most of the other buildings in the area.

As you describe it, your house presumably has the electrical service
panel grounded to an 8 feet long ground rod where the service enters the
house.

The main service panel has 2 ground rods tied to the same buss, The TV
cable entrance has a seperate earth ground, as does the telephone
entrance, and the sub panel in the garage.

You seem to have added a second 8 feet ground rod to your home
specifically for the Ham station.

Yes and that one too.

Check with a local electrician for specific compliance issues.

done did... the sparky is the one that put the extra rods in for the
service entrance and the garage sub panel, and the city inspector signed
off on it.

/s/ DD



You bonded all the grounds, eh?

no, the RF grounds are not bonded to the power grounds.

Radio Shack sells Feriite-magnetic chokes, for maybe 3$. They are the
round things you often see on your computer cables and power supplies.
They absorb stray RF. They just snap together around a wire. Get a few
and try it, its cheap and worth a try.

Sheilding can be tried but I believe need to be grounded somehow.

I dought a fix may be complete, for this issue file in small claims
now, it will be cooling season before you are heard. Filing will wake
everyone up to give it effort this month.

I'm pleased to report that installation of the shielded cable between
the draft inducer motor and the control board reduced the radio
interference to an acceptable level. Measurements indicate that the
amplitude of the noise is reduced by approximately 20dB. The noise can
now only be heard when my walkman is within 2 feet of the furnace.
Interference on 14MHz is reduced below my ambient noise level from
natural sources.

For all interested, the "shielded cable kit" is part number KIT09682.
It is specifically designed for the following furnace models: UY-W4,
DY-W4, UX-R-W3, and DX-R-W3. Note that the shielded cable has a ground
lead on each end. For effective noise suppression it is essential that
each ground lead be connected to the points specified by the
instructions.


modelman wrote:
Several months ago I had a high efficiency Trane XV90 natural gas
furnace and heat pump installed. Since the weather has recently been
cold enough for the gas furnace to provide heat, I have been
experiencing severe radio interference. The interference wipes out AM
broadcast reception throughout my house. I also see snow on a TV
connected to an external antenna.

The radio noise occurs as soon as the draft inducer motor starts up;
the pitch of the interference is related to the motor speed. The draft
inducer motor is a dc motor driven by a PWM controller on the main
circuit board. It is well known that PWM systems generate strong
harmonics throughout the radio spectrum, resulting in radio
interference. However, properly designed PWM systems include filtering
and shielding to suppress the radio frequency currents from the wiring.

I contacted my installer, who is totally unfamiliar with the problem.
The electrician who was sent to my house to investigate the problem
also doesn't understand what's going on. I had to explain the
difference between an RF ground and dc or house ground to him.
Although everything appears to be well grounded from a dc perspective,
I suspect that portions of the system are radiating RF energy.

Several days ago I emailed Trane about the problem, but haven't
received any response.

Although there has been past discussion in this group about radio/TV
interference emanating from Trane high efficiency gas furnaces, I
haven't seen any definitive fix. Does anyone know if Trane has a fix
for this problem. Do they have a shielded cable and or rf filter kit
to suppress this noise? Since my system is under warranty, I won't
attempt any modiifcations to the system.

Has anyone experienced this problem?

Thanks.

Excellent----It appears that Trane improved on the shielded cable design--at
least, from your description, it certainly is different than what they gave
me. No ground leads and the shielded part of the cable was free floating,
that is, connected to nothing with about 6 in. of unshielded wiring between
the end of the shield and the connector. Thanks for the feedback, I'm sure
that it will be of help to others.
MLD
"modelman" wrote in message
ups.com...
I'm pleased to report that installation of the shielded cable between
the draft inducer motor and the control board reduced the radio
interference to an acceptable level. Measurements indicate that the
amplitude of the noise is reduced by approximately 20dB. The noise can
now only be heard when my walkman is within 2 feet of the furnace.
Interference on 14MHz is reduced below my ambient noise level from
natural sources.

For all interested, the "shielded cable kit" is part number KIT09682.
It is specifically designed for the following furnace models: UY-W4,
DY-W4, UX-R-W3, and DX-R-W3. Note that the shielded cable has a ground
lead on each end. For effective noise suppression it is essential that
each ground lead be connected to the points specified by the
instructions.


modelman wrote:
Several months ago I had a high efficiency Trane XV90 natural gas
furnace and heat pump installed. Since the weather has recently been
cold enough for the gas furnace to provide heat, I have been
experiencing severe radio interference. The interference wipes out AM
broadcast reception throughout my house. I also see snow on a TV
connected to an external antenna.

The radio noise occurs as soon as the draft inducer motor starts up;
the pitch of the interference is related to the motor speed. The draft
inducer motor is a dc motor driven by a PWM controller on the main
circuit board. It is well known that PWM systems generate strong
harmonics throughout the radio spectrum, resulting in radio
interference. However, properly designed PWM systems include filtering
and shielding to suppress the radio frequency currents from the wiring.

I contacted my installer, who is totally unfamiliar with the problem.
The electrician who was sent to my house to investigate the problem
also doesn't understand what's going on. I had to explain the
difference between an RF ground and dc or house ground to him.
Although everything appears to be well grounded from a dc perspective,
I suspect that portions of the system are radiating RF energy.

Several days ago I emailed Trane about the problem, but haven't
received any response.

Although there has been past discussion in this group about radio/TV
interference emanating from Trane high efficiency gas furnaces, I
haven't seen any definitive fix. Does anyone know if Trane has a fix
for this problem. Do they have a shielded cable and or rf filter kit
to suppress this noise? Since my system is under warranty, I won't
attempt any modiifcations to the system.

Has anyone experienced this problem?

Thanks.

Dave wrote:
AKS wrote:

SNIPPED


Gentlemen Hi
and there is nothing that could be done to force OEMs
for clean up this interference (RFI?) That is nice but
you and I if interfere with some one TV in Neighborhood
FCC would be all over our ass thanks for equal justice
KA2AYS



Not quite true!

I run 1KW on low bands [75 and 20 meters]. I have a tuner and low pass filters
in line. My station is properly grounded to the service panel ground/earth rod.
This connection is also the equipotential surface for the operating position.

My station meets ALL FCC requirements.

If a neighbor's tv, phone, stereo, or whatever, picks up my transmissions the
problem is with their equipment and I am NOT responsible for correcting the
situation. I will advise them regarding what needs to be done at their end and
at their expense. The best demonstration is to invite them into my station and
have them witness my tv, phone, stereo etc., being interference free.

The best demonstration is an RFI free home station.

We, hams, are not responsible for deficiencies in consumer electronics. That
rests with the manufacturer. The next time you buy a stereo read the Part 15
compliance statement!

Most likely it states, I paraphrase, this equipment MAY receive interfering
signals from near by transmitters. Buyer Beware!

/s/ DD

daev you need sum quiot time on you mothrerfukcer! fi you were ym
naibor i wood kike your ass mothrerfukcer but yuo are two ignoriant to
even railize it

gte hlep

an_old_friend wrote:
Dave wrote:
AKS wrote:

SNIPPED


Gentlemen Hi
and there is nothing that could be done to force OEMs
for clean up this interference (RFI?) That is nice but
you and I if interfere with some one TV in Neighborhood
FCC would be all over our ass thanks for equal justice
KA2AYS



Not quite true!

I run 1KW on low bands [75 and 20 meters]. I have a tuner and low pass filters
in line. My station is properly grounded to the service panel ground/earth rod.
This connection is also the equipotential surface for the operating position.

My station meets ALL FCC requirements.

If a neighbor's tv, phone, stereo, or whatever, picks up my transmissions the
problem is with their equipment and I am NOT responsible for correcting the
situation. I will advise them regarding what needs to be done at their end and
at their expense. The best demonstration is to invite them into my station and
have them witness my tv, phone, stereo etc., being interference free.

The best demonstration is an RFI free home station.

We, hams, are not responsible for deficiencies in consumer electronics. That
rests with the manufacturer. The next time you buy a stereo read the Part 15
compliance statement!

Most likely it states, I paraphrase, this equipment MAY receive interfering
signals from near by transmitters. Buyer Beware!

/s/ DD

daev you need sum quiot time on you mothrerfukcer! fi you were ym
naibor i wood kike your ass mothrerfukcer but yuo are two ignoriant to
even railize it

gte hlep

id theft isa crime

Glad to hear that it helped your interference problem. I'm in the
process of getting my local dealer to acquire and install the shielded
cable kit.


modelman wrote:
I'm pleased to report that installation of the shielded cable between
the draft inducer motor and the control board reduced the radio
interference to an acceptable level. Measurements indicate that the
amplitude of the noise is reduced by approximately 20dB. The noise can
now only be heard when my walkman is within 2 feet of the furnace.
Interference on 14MHz is reduced below my ambient noise level from
natural sources.

For all interested, the "shielded cable kit" is part number KIT09682.
It is specifically designed for the following furnace models: UY-W4,
DY-W4, UX-R-W3, and DX-R-W3. Note that the shielded cable has a ground
lead on each end. For effective noise suppression it is essential that
each ground lead be connected to the points specified by the
instructions.

On 14 Nov 2006 13:41:22 -0800, "an_old_friend"
wrote:


an_old_friend wrote:

lying again forger
http://kb9rqz.blogspot.com/

--
Posted via a free Usenet account from http://www.teranews.com

On 14 Nov 2006 13:38:27 -0800, "an_old_friend"
wrote:



id theft is still acrime
http://kb9rqz.blogspot.com/

--
Posted via a free Usenet account from http://www.teranews.com

modelman wrote:

I'm pleased to report that installation of the shielded cable between
the draft inducer motor and the control board reduced the radio
interference to an acceptable level. Measurements indicate that the
amplitude of the noise is reduced by approximately 20dB. The noise can
now only be heard when my walkman is within 2 feet of the furnace.
Interference on 14MHz is reduced below my ambient noise level from
natural sources.

For all interested, the "shielded cable kit" is part number KIT09682.
It is specifically designed for the following furnace models: UY-W4,
DY-W4, UX-R-W3, and DX-R-W3. Note that the shielded cable has a ground
lead on each end. For effective noise suppression it is essential that
each ground lead be connected to the points specified by the
instructions.

modelman,
Thanks so much for following up. I am curious about the furnace models you
wrote above because they only have 4-5 characters. My furnace model number
is AUY060R9V3W5 and other AUY/TUY model numbers are similar. Does the W4 in
UY-W4 refer to the last two characters of the model number? I believe the
last digit is a revision number but am not sure. I have the same exact
symptoms so I am curious if that kit would also apply to me. I've queried
the factory, but no response thus far.

Thanks!

I just had this shielded cable kit installed on my Trane XV90.
Unfortunately, it did not improve the RF interference problem and
actually might have made it worse. On 14 MHz my S-meter jumps from 0-1
to S9 when the inducer blower turns on.


modelman wrote:
I'm pleased to report that installation of the shielded cable between
the draft inducer motor and the control board reduced the radio
interference to an acceptable level. Measurements indicate that the
amplitude of the noise is reduced by approximately 20dB. The noise can
now only be heard when my walkman is within 2 feet of the furnace.
Interference on 14MHz is reduced below my ambient noise level from
natural sources.

For all interested, the "shielded cable kit" is part number KIT09682.
It is specifically designed for the following furnace models: UY-W4,
DY-W4, UX-R-W3, and DX-R-W3. Note that the shielded cable has a ground
lead on each end. For effective noise suppression it is essential that
each ground lead be connected to the points specified by the
instructions.


modelman wrote:
Several months ago I had a high efficiency Trane XV90 natural gas
furnace and heat pump installed. Since the weather has recently been
cold enough for the gas furnace to provide heat, I have been
experiencing severe radio interference. The interference wipes out AM
broadcast reception throughout my house. I also see snow on a TV
connected to an external antenna.

The radio noise occurs as soon as the draft inducer motor starts up;
the pitch of the interference is related to the motor speed. The draft
inducer motor is a dc motor driven by a PWM controller on the main
circuit board. It is well known that PWM systems generate strong
harmonics throughout the radio spectrum, resulting in radio
interference. However, properly designed PWM systems include filtering
and shielding to suppress the radio frequency currents from the wiring.

I contacted my installer, who is totally unfamiliar with the problem.
The electrician who was sent to my house to investigate the problem
also doesn't understand what's going on. I had to explain the
difference between an RF ground and dc or house ground to him.
Although everything appears to be well grounded from a dc perspective,
I suspect that portions of the system are radiating RF energy.

Several days ago I emailed Trane about the problem, but haven't
received any response.

Although there has been past discussion in this group about radio/TV
interference emanating from Trane high efficiency gas furnaces, I
haven't seen any definitive fix. Does anyone know if Trane has a fix
for this problem. Do they have a shielded cable and or rf filter kit
to suppress this noise? Since my system is under warranty, I won't
attempt any modiifcations to the system.

Has anyone experienced this problem?

Thanks.