Navien NPE-180A Service Manual page 113

Emergency measures for a blocked mixing valve * (refer to page 47 for Component Test mode
information)
1. Switch off power, shut off water supply to the unit, and drain water from the unit.
2. Remove the top/bottom clips of the mixing valve.
3. Disassemble the motor and open the lid.
4. Turn the mixing valve axis disk counterclockwise until it does not turn anymore.
5. Pull out the mixing valve power connector.
6. Reconnect power and start the unit while using hot water.
Turn the gear clockwise to open the valve Closed Position Open Position
manually
112 NPE Service Manual Version 2.21