NR-240A Navien Code 38

[Chuck Martel]

Hey have an issue with my Navien. First time I noticed it had a buzzing noise, found it was the recirculating pump humming/grinding. Reset the unit and got code 38. Check board voltage to pump, good. So I replaced the pump and flow switch, unit still has same issue. I turned the dip switch off so I don’t burn the pump out again. Any ideas? When the pump does turn on there’s flow I can feel in the pipe but not enough to trip the flow switch. Code resets after you run water but the pump tries every 30 or so seconds.

 

[TEch99]

Just noticed you replaced the Flow switch. Disregard the below but might help someone else.

 

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[Tuttles Revenge]

Have you called Navien? 1st thing to do IMO.

Last 038 I got was an o-ring stuck in the flow sensor.