A.O. Smith 110-310-510 – CLEANING THE ROD ASSEMBLY

1)TOOLS ? Gather the following materials together:
a. Sheet of 100 Grit Sandpaper
b. #2 Philips Screw Driver
c. Flashlight
2)POWER ? Disconnect power to your unit by either unplugging it from the wall outlet, or by the circuit breaker, depending on the setup. The 3?digit LED on the PCB should not be lit.
3)FRONT COVER ? Remove the front cover. It is held on by two screws on the top corners of the tankless unit.
a. Locate the black, yellow, and orange wires located in the center of the unit.
b. Remove the three Phillips head screws holding the panel in place.
c. Pull the assembly out. Caution, all pieces are separate. Be careful to not lose the sight glass.
5)SENSORS – It is important to be very gentle with the sensors while cleaning them, as they will easily bend out of place. Their original position relative to the burner needs to be unaltered to function properly.
a. Clean the flame sensor with 100 grit sandpaper, thoroughly to a bright finish.
b. Clean the air fuel ratio rod with 100 grit sandpaper, thoroughly to a bright finish.
6)REASSEMBLE ? Reassemble the unit in reverse order – sight glass, gasket, rods, and metal cover. Key points to remember:
a. Connect all 3 wires on front of burner.
b. Inspect all of the gaskets.