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  1. Terry O Pfeffer

    Navien CH-240 air starvation

    I have a ch-240 had problems a long time, as other people would not run with front cover on. there is a flapper valve ( back flow preventer ) on the intake mine was stuck in about halfway position, cleaned that and all I could get to. ( it now works fine)
  2. Terry O Pfeffer

    Navien CH-240 air starvation

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