What should I do if the recirculation feature and H2Air kit interfere?
Avoid configuring a system to use both external hot water recirculation mode (ComfortFlow) and the Navien H2Air add-on controller simultaneously as they are incompatible. Refer to page 18 for proper setup instructions or consult an authorized technician.
From the official Navien Npe 240a2 manual, page 19
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