Noritz NC1991-OD-LP - Maintenance

To prevent burns or scalding, turn off the power button or power supply and wait until the equipment cools before performing maintenance.

Check for laundry, newspaper, timber, oil, spray cans and other combustible materials.
Check for abnormal sounds during operation.
Check for abnormalities in external appearance, change in color or flaws.
Check for proper operation of pressure relief valve.
Check for water leaks from the equipment and piping.
Check for dust and soot in the exhaust vent or exhaust vent terminal.
Check for dust or debris in the air inlet.

Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent to clean any stains.

Close the water supply valve.
Open all hot water fixtures
With a bucket ready, remove the inlet and outlet drain plugs (about 0.2 gal. will drain out)
Take the water filter out of the inlet.
Clean the filter with a brush under running water.
Replace the filter and close the drain plugs. (Take care not to lose the packing.)
Close all hot water fixtures.
Open the water supply valve and check that water does not leak from the drain plugs or filter.