Non-Condensing Models - AO Smith Water Heaters

Troubleshooting Guide5) FANa. The fan is held in by two screws. They face the bottom ofthe heater, and can be reached by two holes in the bottomof the case with a long screwdriver.b. Slide it left to release it from the grooves.6) WATERWAYSa. If the unit has not been drained at this point, now is thetime to do so. Refer to the Draining the Unit procedure inthe troubleshooting procedures section.b. Disconnect the waterway clips pictured at the right.c. Place a dry towel in the bottom of the unit case whendislodging the pipes from their sockets.Figure 317) REMOVE THE HEAT EXCHANGERa. Remove the two screws at the top of the heat exchanger.b. The heat exchanger should be free to be removed. Ifthere are any missed wires still connected to the heatexchanger assembly, remove them so the heat exchangeris completely free.8) REPLACE THE HEAT EXCHANGER COMPONENTSa. Remove and inspect the new heat exchanger making sure Figure 32it is designed for the correct model and is notdamaged at all.b. Install the following items from the oldexchanger onto the new one:i. Overheat Cutoff Fuseii. Freeze protection blocksiii. Plastic pressure portiv. Hi‐Limit switchv. Hot water thermistorvi. Silicon Vent GasketFigure 339) REASSEMBLE ‐ Reassemble the unit in reverse order. Key points to remember:a. All wires must be reconnected. Keep wires dangling out in front of the unit, never push themtoward the back where they are not visible; you will forget about them.b. Inspect all of the gaskets.c. Be aware of the various O‐rings on the gas and water valves, along with the waterway clips.d. Reattach all extra components that the manifold screws secure in their places.e. Do not have any screws left over.30| Page