You have a train furnace it it sounds like a pressure problem in the inducer
or the pressur switch. Tell the company to come out with their manometerand
t fittings if they come out again. This will have to be fixed by a
qualified Trane dealer, not someone who is not versed in service. So far it
seems you have had parts changers out there

--
Bob Pietrangelo


www.comfort-solution.biz
On Time or Your Service Call is FREE
Preventive Maintenance Specialist




"Bill" wrote in message
oups.com...

Joseph wrote:
"Bill" wrote in message
ups.com...
I have a furnace

Model# Serial# may be of help.

Joseph, thanks for your input on this. The furnace is a Trane XV80,
TUD100R9U5K; Z291YLRIG



The flame sensor does exactly what you would think it does. It
senses
current rectification through the flame to ground. The control
module looks
for that current after it opens the main valve. If it is not there
then the
system goes into lock out. Each unit is a little different but the
basics
are the same for all.

Is the current in the sensor all of the time, or only after the valve
opens?


Is the guy working on it the one that installed it? You might
want to
call the Mfg and explain the situation to them and see if they can
remedy
the problem. It's hard to tell what other possible solutions there
may be
w/o being able to put my hands on it, I can only make a WAG. This
may be a
bad Molex plug, wire connector slowly deteriorating, piece of debris
in gas
line... etc...

Yes, the same folks that installed it are the ones trying to repair it.
What is a Molex plug?

Thanks.

Bill