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Old 12-03-2008, 07:38 PM   #1
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TRANE XR90 wont turn on


Hi,

Wife and I just bought our first house. We have zone heating with 2 furnaces. This house is almost 130 years old (built 1880, remodeled 2002). From what I have learned it was easier to have a second furnace on the third floor and blow heat down through the ceiling for the second floor then run pipes from the basement to second and third.

They are same unit, both Trane XR 90.

The second unit located in the Attic is giving us trouble. When I try to turn on the heat, I hear two clear "CLICKS" from the unit and then I get 3 LED message which I have learned is PRESSURE SWITCH ERROR.

I have checked the filter, thats fine. Also when I switch the thermostat to the ON position (not auto), the blower comes on and just pushes air just fine. I can feel the air coming out on both floors and feel the air going into the intakes. As its moving into Mid December the second and third floors of the house are starting to get a bit nippy.

Thank you in advanced for help.
-New Home Owner 08

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Old 12-04-2008, 01:27 AM   #2
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TRANE XR90 wont turn on


The pressure switch, senses pressure from the combustion/inducer.
Not the indoor fan.
Is the draft inducer coming on.

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Old 12-05-2008, 02:00 PM   #3
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TRANE XR90 wont turn on


I didnt pay attention if it was. At the office right now, going to check when I get home. To double check draft inducers are typically black, inside the furnace and looks like a cross between Leaf blower and car alternator. Mine appears to be contained in the right compartment. My furnace sits horizontal and all the circuitry is on the left side.

Thanks,
New Home Owner
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Old 12-06-2008, 03:59 AM   #4
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TRANE XR90 wont turn on


Yes. Generally black, and are simular looking to a leaf blower/mulcher.
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