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Navien NPE-180A Service Manual page 110

Npe series condensing water heaters
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1. Drain water from the unit, then remove the 4 screws and
retaining clips from the flow sensor.
2. Detach the 2 wire connectors that connect the flow sensor to
the PCB.
3. Blow air through the flow sensor. Check that the impeller
rotates freely.
Troubleshooting
109
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This manual is also suitable for:

Npe-210aNpe-180sNpe-210sNpe-240sNpe-240aNpe-150s

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