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    Navien NPE-240A2 error code 515-09

    Ever since I installed my Navien 240A2 I have had a small but annoying issue with random shut downs of the heater with the diplay reading error code 515-09 “abnormal pcb.“ The unit may go a couple of weeks without an issue and then suddenly cutout twice in three days. Fortunately, resetting the...
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    Navien NPE-240A2 adding external recirculation valve

    My NPE-240A2 was installed in June 2022 with a recirculation line. Unit ran fine for seven months until the internal check valve failed in February 2023. With a bit of difficulty I was able to obtain two replacement check valves (the check valve part number for the newer NPE units is #30024442A...
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