Navien NP-180 Service Manual page 108

Emergency measures against closed flow control valve
(manual open)
1. Switch off power, close the manual water valve, and drain water from the unit.
2. Remove the top/bottom clips of the water adjustment valve.
3. Disassemble the motor and open the lid.
4. Turn the water adjustment valve axis disk counterclockwise to the end.
5. Pull out the water adjustment valve power connector.
(Keep the water adjustment valve feedback sensor connected.)
6. Plug the power cord, and start the unit while using hot water.
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©Navien America Inc. 2010 NR/NP series service Manual Version 2.0