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Question

My Trane XL 80 ignites but won't stay lit. After the flame goes out the indicator lamp flashes 3 times indicating a pressure switch failure according to the diags listed on the control....where is the pressure switch ? Can I replace it myself ? and where can I locate it right away ?

Submitted: 325 days and 15 hours ago.
Category: HVAC
Value: $9
Status: CLOSED
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Posted by coolman1973 325 days and 15 hours ago.

Answer

ok when the furnace starts the small inducer comes on first on that motor there is a little tube that goes from the motor to the pressure switch, take the tube off the inducer motor and blow into it and suck. put it back, then were the flue pipe meets the inducer pull the flue pipe off and restart the furnace see if it stays lit

325 days and 15 hours ago.

Reply

I'm not following where the tube is...All I see are wires...

Posted by coolman1973 325 days and 15 hours ago.

Answer

there is a rubber tube hooke on that motor somewhere it may me orange

325 days and 15 hours ago.

Reply

I found the tube, and it has a Y....going to I believe 2 switches...I sucked and blew on the tube....same 3 light flash when I restarted the heater

Posted by coolman1973 325 days and 15 hours ago.

Answer

did u pull the flue pipe off

Posted by coolman1973 325 days and 15 hours ago.

Answer

also hit the switches with ur finger and restart the furnace

325 days and 14 hours ago.

Reply

Still the same issue...the flue is disconnected....I sucked and blew on the vacuum tube....I tapped on the switches...it reverts back to 3 flashes

There is a P01 High and a P02 low

Posted by coolman1973 325 days and 14 hours ago.

Answer

the small inducer motor runs right

325 days and 14 hours ago.

Reply

you're speaking about the small motor that is mounted to the same manifold I pulled the tube out of ....yes it does run and is outputting the exhaust into my heating closet as I have removed the flue vent from it

Posted by coolman1973 325 days and 14 hours ago.

Answer

u have a low fire and high fire press tube ok were the tube Y pull them apart and suck on each single tube going to each pressure switch try that, i know this seems repetitive but this is the best way. let me know

325 days and 14 hours ago.

Reply

I went through the process again...now the heater is running....the flue is still disconnected and it is blowing heat into the house...should I put the flue back on

Posted by coolman1973 325 days and 14 hours ago.

Answer

yes see if the furnace cuts out when u put it back on

325 days and 14 hours ago.

Reply

It did not cut offf when I put it back on and the controller is calling for heat

325 days and 14 hours ago.

Reply

are the P switches just touchy or do you think they were stuck

Posted by coolman1973 325 days and 14 hours ago.

Answer

they can stick but i would check to make sure ur flue pipe is clear andchimmney if it is then ur press switch may be going bad or like we said just stuck.

325 days and 14 hours ago.

Reply

should I replace the switches regardless?

Posted by coolman1973 325 days and 14 hours ago.

Answer

y not

325 days and 14 hours ago.

Reply

were the switches just stuck....I also noticed about 5 minutes after the heater was running the motor really kicked it up a notch and is blowing with more force now

Posted by coolman1973 325 days and 14 hours ago.

Answer

the high fire swich was prob the one sticking

325 days and 14 hours ago.

Reply

Thanks for your help....hopefully I can find the switches tomorrow or do you have an online source

Accepted Answer

no dont really know sorry

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Expert: coolman1973
Pos. Feedback: 95.9 %
Accepts: 
Answered: 1/1/2009

Hvac tech and Mechanic

15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.

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