Navien Flow Sensor Repair and Fix

This problem typically starts with an ERROR 001, ERROR 038, or ERROR 039, but your Navien could show a number of other errors caused by the faulty flow sensor. We will discuss further below.

First thing, if you need hot water immediately, try unplugging the system wait 30 seconds, plug it back in.  This resets your tankless and may give you hot water again for a quick shower or temporary use.  Don’t forget though, this type of error typically will reappear again shortly.

Disclaimer

We recommend you call a certified technician to replace your flow sensor, you are liable for any damage you cause to yourself, your tankless, and it could void your Navien warranty. That being said we understand that homeowners are squeezed in every which way for every penny they have, this is a fairly easy replacement job and the parts are cheap as well.

Replacement Navien Flow Sensor

  1. NPE/S model tankless – Part # 30011534A (out of stock)
  2. NPE/A model tankless – Part # 30008571A
  3. All other models*  – Part # 30010537A

*Replaces BH1406004F, 30002669A, 30004802C

CC
CC180
CC-180
CC-210
CC210
CC-240
CC240

NP
NP180
NP240
NP240A
NP-240
NP-240A

CR
CR180
CR-180
CR180A
CR-180A
CR210
CR-210
CR210A
CR-210A
CR240
CR240A
CR-240
CR-240A

NR
NR180
NR-180
NR180A
NR-180A
NR210
NR-210
NR210A
NR-210A
NR240
NR240A
NR-240
NR-240A

How To Replace The Flow Sensor

Navien Flow Sensor Replacement Video

Additional Notes


There are a few things to mention here.

  1. Sometimes the flow sensor just needs to be cleaned up and reinstalled to correct the error. If you have heavy scale and calcium in your water a good cleaning may be all that is necessary.
  2. Occasionally something like an error 012 will display indicating a flame loss, this could be indirectly caused by the flow sensor. If your flow sensor is working intermittently the tankless could read no water flow cut the flame but then get flow from the flow sensor again. This situation could theoretically then throw a flame loss error.
  3. Clean the water inlet filter/s. If these get clogged or gummed up water flow will slow to a trickle and you might get a false negative flow sensor error.

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