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.
Water Drain Valve (with Water Filter)
If the water drain valve (with 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 Drain Valve (with Water Filter) Maintenance
Source: Noritz (support.noritz.com)