Navien NP-180 Service Manual page 113

Check method
Error type Cause Check method
Check the contact between the water leak sensor wires and with the
No internal
Defective sensor
water heater enclosure base.
water leak
1. Check the leaking part, and repair the part.
Internal water
Defective part
2. Check molex connection on board for moisture
leak
If the trouble continues despite the checking of above items,
the PCB is defective.
Defective
Other trouble
Check to make sure that the ends of the wires are both not contacting
PCB
the cabinet.
< Water leak sensor wire : Blue 2P>
111
©Navien America Inc. 2010 NR/NP series service Manual Version 2.0