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    Feb 9, 2011, 07:41 PM
    Trane xl20i error code 90?
    I have a newly installed Trane 4 ton xl20i, all factory matched components. Within days of installation I had the red light come on showing error code 90. Installer has been out numerous times to check wires, clean wires, change wires, check voltages, etc. Last visit a new factory shipped circuit board was installed and it worked fine for one day, but alas, now inop again due to error code 90. Now what? 02/09/2011

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