Maintenance And Troubleshooting - Noritz HYBRID HOT Installation And Operation Manual

Maintenance and Troubleshooting

Storage Tank Maintenance
Water heater maintenance includes periodic tank flushing and cleaning, and removal of limescale. It is
recommended that the water heater storage tank be drained and flushed every 6 months to reduce
sediment buildup.
Draining the Storage tank
To completely drain the storage tank:
1. Turn the power off to the system by disconnecting power to the system. The system will not be
fully shut down by pressing the "On/Off" button on the remote controller.
2. Turn off the gas manual shut-off valve.
3. Ensure the cold water supply valve is open.
4. Open a hot water fixture and let the water unit until the water is no longer hot.
5. Close the cold water supply manual shut-off valve.
6. Connect one end of a garden hose to the storage tank drain valve. Place the other end of the
garden hose next to a free flowing drain.
7. Open a hot water faucet within the plumbing system to relieve pressure and allow air into the
system (if not already done in step 4).
8. Slowly open the drain valve by turning the knob counterclockwise.
9. Close the water heater drain valve when all water in the storage tank has drained.
10. Close the hot water faucet opened in step 4.
11. If the water heater will be shut down for an extended period of time, the drain valve should be
left open.
Flushing the Storage Tank
1. Follow steps 1-4 of the "Draining the Storage Tank" process above.
2. Close the hot water fixture.
3. Connect one end of a garden hose to the storage tank drain valve. Place the other end of the
garden hose next to a free-flowing drain. Ensure the garden hose is secured before and during
the flushing procedure. Flushing is performed with system water pressure applied to the water
heater.
4. Open the drain valve to flush the storage tank. Continue to flush water through the storage
tank to remove sediment and allow the water to flow until runs clean.
5. Close the storage tank drain valve when flushing is completed.
6. Remove the drain hose.
7. Fill the water heater (Refer to "Filling the System" section of this manual)
8. Restore power to the water heater to place the system back in operation.
Tankless Water Heater Maintenance
Noritz America Corporation
NHH199 Hybrid Hot Installation and Operations Manual
Rev 03/23
33