Bosch Indoor Residential Tankless Water Heater T9800SE 199

DANGER! Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves before servicing.

DANGER! Risk of explosion! Replace all dismantled seals and o-rings with new ones.

Water supply has a high mineral content?

Scale build up will shorten the life of the water heater and damage resulting from scale is not covered under warranty.

A water softener is required if the water hardness exceeds 12 grains/gal (200 mg/l) calcium carbonate. Damage to the water heater resulting from hard water/scale deposits will not be covered under warranty.

Electrical supply disconnected from the water heater?

Water supply to the water heater shut off?

Hot water faucets opened to drain and relieve pressure from the plumbing system?

Hot water valve to the water heater shut off?

DANGER! Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves before servicing.

DANGER! Risk of explosion! Replace all dismantled seals and o-rings with new ones.

Verify the inlet water filter screen is clean and undamaged.

The inlet water filter is located on the top of the appliance, at the cold water inlet connection.

Close the installer supplied water shutoff valve purge the water using discharge drains and remove the brass hex cap holding filter.

Remove the filter, clean and/ or replace if damaged.

Sign off on the inlet water filter inspection

DANGER! Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves before servicing.

DANGER! Risk of explosion! Replace all dismantled seals and o-rings with new ones.

Water supply has a high mineral content?

Water hardness exceeds 12 grains/gal (200 mg/l) calcium carbonate?

Electrical supply from the water heater disconnected?

Water supply to the water heater shut off?

Hot water faucets opened to drain and relieve pressure from the plumbing system?

DANGER! Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves before servicing.

DANGER! Risk of explosion! Replace all dismantled seals and o-rings with new ones.

Inspect burner observation window for cracks or spillage of flue gases.

Observe burner flames during heater operation. Flames should be steady and blue with no signs of yellowing.

Yellow burner flames are an indication of improper combustion.

Refer to section 4.6 to verify the exhaust system and combustion air supply meets the manufacturer's specifications.

Manually open the pressure relief valve to ensure proper operation, make sure discharge drains away safely.

Sign off on the heat exchanger inspection

DANGER! Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves before servicing.

DANGER! Risk of explosion! Replace all dismantled seals and o-rings with new ones.

Verify if the air filter is clean and undamaged.

Air filter must be cleaned or replaced in case it is clogged or damaged.

How to remove/assembly air filter

Disconnect the electrical supply from the water heater.

Remove cover from the air filter.

Loosen two philips head screws.