Rinnai Water Heater CU199i

Check the water heater for any visible signs of damage

Ensure the water lines are insulated

Refer to the 'Freeze Protection' section in the manual

Manually drain the water heater if necessary

Verify the installation of drain down solenoid valves

Check the functionality of the drain down solenoid valves

Push the 'On/Off' button located on the right-hand side of the controller

Remove four screws securing the front panel

Remove the front panel and locate the filter at the upper right-hand corner of the water heater

Remove the air filter by pulling out the 'FILTER Pull to Clean' tab

Scrub the filter area of the air filter door with mild dish soap and a soft bristle brush

Check for lint and dust build-up on the air filter

Inspect the air filter for any visible damage

Describe the cleaning process performed

Contact a trained and qualified professional for a replacement if the air filter is damaged

Ensure discharge has a safe place to flow

Verify no contact with body or property

Operate the pressure relief valve manually

Was the valve operation successful?

Record any issues encountered during the test

Testing the pressure relief valve should only be performed by a licensed professional

Turn off power at the controller

Disconnect electrical power to the water heater

Close the shutoff valves on both the hot water and cold water lines (V3 and V4)

Connect pump outlet hose (H1) to the cold water line at service valve (V2)

Connect drain hose (H3) to the hot water line at service valve (V1)

Pour four gallons of undiluted virgin, food grade, white vinegar into pail