Non-Condensing Models - AO Smith Water Heaters

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Troubleshooting GuideCLEANING THE COMBUSTION COMPONENTSProcedure for cleaning the fan, burner, Flame Sensor and AFR, as used by all Service Representatives.1) TOOLS ‐ Gather the following materials together:a. Degreaser in a pump action bottle, Sandpaper, Philips Screw Driver, Needle‐Nosed Pliers, DuctTape, Flashlight, Air Compressor, Shop Vacuum, 3x Towels2) POWER ‐ Disconnect power to your unit by either unplugging it from the wall outlet, or by the circuitbreaker, depending on the setup.3) GAS ‐ Shut off the gas supply.4) FRONT COVER ‐ Remove the front cover.5) MANIFOLD PLATE/GAS VALVE ASSEMBLY ‐a. Remove the manifold plate screws. They are wide pan head Philips screws, located on theedges of the stamped metal plate of the gas manifoldb. Remove the brass gas valve screw.c. Remove the wire holding the Easy‐Link wires in place.d. Disconnect the clear plastic tube from beneath the combustion chambere. Gently lift up the manifold & gas valve assembly to dislodge it from the gas inlet, and gently let ithang.i. There is a small filter screen in the bottom of the gas inlet. Do not lose it.Figure 25Figure 2626| Page
Troubleshooting Guide6) BURNER ASSEMBLY ‐ Now proceed to remove the burner assembly.a. Remove the five wide pan head Philips screws holding the burner to the combustion chamber.There are three at the top of the burner. There are two at the bottom of the burner to the backof the combustion chamber.b. Disconnect the rod assembly: Orange flame sensor, Yellow AFR, Black igniter wirec. Remove the burner. It may be hard to take out, so try the following:i. With pliers, grasp between the oval air vents in the front of the burner on the far left and pullfirmly. Repeat on the right vent.ii. Now pull from the center and it should slide out readily.d. Inspect the gasket. (Minor surface tears are allowable. Major separations are not acceptable.Rod AssemblyFigure 277) CLEAN THE BURNER – Use degreaser in a pump action bottle.a. Protect the burner gasket from direct water pressure.IF the gasket becomes compromised, please contact theTechnical Service Department for further assistance.b. Thoroughly saturate the burner with the cleaning solutionfrom the top, down through the slots, as well as theopenings in the front of the burner until the burner issoaking wet.c. Let the burner sit for 5 minutes.d. Remove the burner from the solution. Set the burner in a Figure 28sink in its normal upright position and wash the burnerwith a high flow of water down into the slots, starting at the back and moving forward. Again,ensure that no contact is made with the gaskets.e. Use compressed air to clear excessive water from the burner after rinsing. Inspect the gasket.(Minor surface tears are allowable. Major separations are not acceptable)8) FAN ‐ The fan is probably coated with dust as well.a. Place a towel at the bottom of the heat exchanger to cover the square port to the fan. Thistowel will catch all the dust blown in the next step.b. Use compressed air to blow into the fan. It will rotate and dust will fly out of the fan housinginto the towel above.27| Page
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Non-Condensing Models - AO Smith Water Heaters

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