Do not use benzene, oil or fatty detergent to clean the remote controller. Deformation may occur.
The remote controller is waterproof, but it should be kept dry as much as possible.
Air Inlet Filter (NR98SV (GQ-2857WX-F US))
CAUTION: Do not remove the air inlet filter. If it is removed or damaged, please contact Noritz America. Damage caused by operating the water heater without the air inlet filter is not covered under warranty.
Water Drain Valve (with Water Filter)
If the water filter is covered with debris, the hot water may not run smoothly, or the unit may put out cold water. Check and clean the filter as explained below.
To avoid burns, wait until the equipment cools down before draining the water. The appliance remains hot after it is turned off.
Water Filter (with Water Filter) Maintenance
Source: Noritz (support.noritz.com)