To clean the air intake filter: Press the Power button on the front panel to turn off the water. Disconnect the power supply to the water heater. Remove the front cover of the water heater. Remove the screw that secures the air intake filter (the filter is. Pull the filter out of the water heater. Click to see full answer. Similarly, it is asked, how do you clean a navien air filter?Clean the intake air filter just above the fan and under the air intake pipe in the top left corner of the water heater as the following. 2. Remove the intake air filter from the bottom of the intake pipe by pulling it out towards the front.Subsequently, question is, how do you clean the filter on a Rheem tankless water heater? Turn the circulating pump off and drain the vinegar from your Rheem tankless unit. Open the main water valve and allow cold water to flush the system for several minutes. As your Rheem tankless water heater has the inlet water filter to protect the system from the dirt, remove it and clean the sediments. Also asked, how much vinegar do I need to clean a tankless water heater? Use 2.5 gallons (9.46 liters) of undiluted white vinegar to clean your tankless water heater at all times instead of chemical solutions. Since your tankless water heater is most likely the source of all your drinking water and bathing water, using chemical cleaning solutions may be extremely harmful to your health.How do I reset my navien water heater?To reset the water heater, press the Reset button. If resetting the water heater does not solve the problem, refer to the Troubleshooting section of this manual or contact Technical Support at 1-800-519-8794. To use water above 140°F (60°C) (up to 182°F (83°C)), you can use Commercial Mode.