Non-Condensing Models - AO Smith Water Heaters

Troubleshooting GuideCHECKING THE OVERHEAT CUTOFF FUSE (OHCF):1) Locate the white OHCF which wraps aroundthe heat exchanger.2) Find the white clip at the end of the two bluebraided wires coming from the OHCF.3) Unplug the connection.4) Test for continuity at the end of the OHCFwith an ohmmeter. If there is continuity, theOHCF is still intact. Reconnect the plug. Ifthere is no continuity, the OHCF has beencompromised. If compromised, contact theTechnical Service Department for furtherassistance.Figure 225) If an ohmmeter is not available, jump the plug connection on the opposite side of the OHCFwith a wire, paper clip, or other metal material.6) Restore power and test unit. Be very cautious with this step. Do not touch the jumper orother electrical components.7) If the unit fires up, it shows that the OHCF has been compromised and the problem was withthe OHCF. If so, contact the Technical Service Department for further assistance. If the unitdoes not fire up, it shows that the cause of the 111 or 121 error code is something else.Continue with the 111 or 121 error code sections of this guide for further troubleshooting.Figure 2324| Page