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-   -   Lennox 21v furnace only high speed only (https://www.askmehelpdesk.com/showthread.php?t=543790)

  • Jan 13, 2011, 05:03 PM
    donnagene
    Lennox 21v furnace only high speed only
    I have a Lennox 21v propane furnace w/4 zones, in heat & cool mode fan operates high speed only, no matter how many zones are calling for heat/cool.Wiring problem?

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