Navien NPE-32AWE, Installation Manual

Page: 43 / 68

43 Maintaining the Water Heater
6. 3 Cleaning the H eat E xchanger
WARNING
Before cleaning the heat exchanger, make sure the water
heater is off.
To properly maintain the water heater, you should clean the heat
exchanger annually.
To clean the heat exchanger:
1. Press the Power button on the front panel to turn off the
water heater.
2. Disconnect the power supply to the water heater.
3. Turn off both gas and water supply to the water heater.
Note
Wait at least 30 minutes for the heat exchanger to
cool down.
4. To gain access to the internal components, remove the front
cover by loosening the four Phillips head screws located at
the top and bottom of the front cover assembly.
6. R emove the recirculation inlet filter from the bottom of the
water heater (“A” model only).
R ecirculation
Inlet Filter
(“A” model only)
Pump Drain Plug
(“A” model only)
Cold Water
Inlet Filter
7 . Open the pump drain plug (“A” model only).
8. R emove the cold water inlet filter.
9. Allow the residual water to drain from the water heater.
10. When the water is completely drained, reinsert the
recirculation inlet filter and the cold water inlet filter, and
then close the pump drain plug.
11. To refill the water heater follow the steps of “Draining the
Water Heater” in reverse.