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Maintenance Instructions
DECLARATION: Only an A. O. Smith authorized service personnel may maintain and repair this
water heater. Improper methods could result in serious injury or property damage.
WARNING - Electric shock: Before repairing the water heater, be sure to disconnect the water
heater from the power source.
CAUTION: Prior to repair works, please refer to the troubleshooting chart.
Maintenance
If the water heater needs to be serviced, close the water inlet valve, then open the drain valve.
Rotate the handle of the relief valve, release the nut connected to the water outlet joint of the inner
tank and drain the water from the discharge pipe.
It is recommended that the system undergo a safety maintenance every 3 years and the tank be
flushed every 6 years to remove sediments which may have built up during operation. The tank
flushing procedure is as follows:
1. Disconnect the power.
2. Screw off the relief valve and remove the internal water inlet pipe of the water heater.
3. Connect the water outlet pipe connection of the water heater to the tap water pipeline and fill
water from this end. The water inlet pipe connection is connected to floor drain by pipes.
Discharge water from this end.
4. Open the water inlet valve to get the maximum tap water flow and flush the tank till the drained
water from the tank becomes clean.
5. Connect the water inlet and outlet pipes again and put the water heater to use after a leakage
test.
CAUTION:
• The drained water might be very hot and may scald.
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