High Limit Switch Removal And Replacement; Service - A.O. Smith AOSRE50400 Instruction Manual

water inlet and outlet, open the nearest hot water tap and follow
filling instructions.
Never use this water heater unless it is completely full of water. To
prevent damage to the tank and heating element, the tank must be
filled with water. Water must flow from the hot water faucet before
turning "ON" power. The manufacturer will not warrant any elements
damaged by failure to follow instructions.
15. Check element for water leaks. If leakage occurs, tighten element.
If necessary drain tank before repeating Steps 7 and 8, remove
element and reposition gasket. Then repeat Steps 10 through 15.
16. Replace the two spade connectors on element into their original
positions.
17. Replace the mounting bracket with the center rise facing outward
and the screw hole up, see Figure 10.
18. Replace the insulation and front panel, lining up the three tabs at
the top with the slots in the casing.
19. Replace the retaining screw and the temperature knob.
20. Plug heater into electrical outlet.
fiGure 10.
TO REMOVE AND REPLACE ANODE:
1. Follow steps 1-8 of the Element Cleaning/Replacement section.
2. Using a 7mm wrench, remove the nut securing the anode.
3. Unscrew and remove anode.
4. Screw in the new anode and secure with the retaining nut.
5. Follow instructions for replacing the element in "ELEMENT
CLEANING/REPLACEMENT."

hiGh limit switch removal and replacement

1. Turn off and unplug the heater from the electrical outlet.
2. Remove the front panel, see the "REMOVING THE FRONT
PANEL" section in this manual. Remove the insulation pad.
Remove personnel barrier.
3. Remove the four wires connected to the switch, taking care
to note the original placement of each wire.
4. Using a 7mm wrench, remove the nuts securing the high
limit switch to the tank enough to rotate the switch 90°
counterclockwise and slide it out from beneath the bracket.
It is not necessary to remove the nuts completely.
5. Place the new switch beneath the bracket and rotate it 90°
clockwise.
note: the taller spade terminal will be on the right side.
6. Replace and tighten the nuts so the high limit switch is firmly
in contact with the tank surface.
7. Replace the four wires, taking care that they are replaced
into their original positions and tighten screws.
8. Replace personnel barrier; replace insulation block and the
front panel.

service

If a condition persists or you are uncertain about the operation
of the water heater contact a service agency.
Use this guide to check a "Leaking" water heater. Many
suspected "Leakers" are not leaking tanks. Often the source of
the water can be found and corrected.
If you are not thoroughly familiar with your water heater and
safety practices, contact a qualified installer to check the water
heater.
16
fiGure 11.