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21 TROUBLESHOOTING Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician. Read the GENERAL SAFETY INFORMATION section first. PROBLEM POSSIBLE MALFUNCTION SERVICE TO BE PERFORMED POSSIBLE SOLUTION NO HOT WATER 1) No pilot A. No gas to pilot Check gas supply Turn on, check pressure Check gas valve Turn on or replace if needed Check pilot orifice for obstruction Clean with air or replace Check pilot tube for kink or leaks Replace pilot tube B. Pilot will not stay lit Check gas pressure Check thermostat MV drop-out voltage Check thermocouple connection and MV output Tighten if loose, replace as necessary Check thermocouple placement in pilot flame 3/8- should be in flame Check pilot for proper flame Change pilot orifice Check ECO operation Check for air in pilot tube Replace gas valve Bleed as necessary C. Pilot blows out Leaking joints Check all vent joints for proper seal. Make sure to check inner and outer pipe and check rear air tube seals. Refer to installation manual. Check for proper vent cap Install A. O. Smith provided vent cap Check for bent, missing, or mislocated pilot shield (natural gas units only) Replace or reposition Check outer door seal Replace gasket if missing Tighten screws if loose Install gasket properly if misinstalled NOT ENOUGH HOT WATER 1) Incorrect burner orifice Check orifice size Replace with correct size 2) No gas to main burner Check gas supply Correct as needed Check thermostat operation Replace as needed 3) Heater too small Confirm sizing requirements Replace with larger heater, add another heater, or decrease water usage. YELLOW FLAMES OR SOOT1) Excessive or low gas pressure Check gas pressure 2) Combustion air restricted Check vent for restrictions Correct as necessary Check venting for extra piping Re-install as recommended in the installation manual CONDENSATION 1) Water on floor under heater See page 21 “CONDENSATION” BURNER WILL NOT STAY LIT 1) Low gas pressure Check gas supply pressureCheck thermostat operation 2) Downdraft or backdraft condition Check for proper vent cap Install proper vent capCheck location of heater Re-install in correct location Check for proper vent sealing Reseal venting Check top and/or bottom air supply box for air leaks Seal as necessary Check outer door seal Replace gasket, tighten screws or re-install gasket as necessary 22 LIMITED RESIDENTIAL GAS WARRANTY THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY. If the glass lined tank in this water heater shall prove upon examination by A. O. Smith Corporation (the warrantor) to have leaked during the warranty period in normal residential use, due to natural corrosion from potable water therein, the warrantor will furnish the ORIGINAL OWNER a replacement A. O. Smith water heater of equivalent size and current model, or a replacement part for any thermostat or thermocouple which fails in normal use, in accordance with the warranty terms and conditions specified below. THE A. O. SMITH REPLACEMENT MODEL OR PART WILL BE WARRANTED FOR ONLY THE UNEXPIRED PORTION OF THE ORIGINAL WARRANTY. The warranty period will be determined by the original installation date of the water heater. PROOF-OF-PURCHASE AND PROOFOF- INSTALLATION ARE NECESSARY TO VALIDATE THIS WARRANTY. This warranty is not transferable and applies to models listed in Table 1. TABLE 1. WARRANTY PERIOD MODEL TANK1 PARTS2 FDV / FDVT / SDV 6 YEARS 6 YEARS When the water heater has been used for other than single family residential application; 1. The tank warranty shall be reduced to 1 year for 6 year models. 2. The parts warranty shall be reduced to 1 year for all models. Returned parts which meet any of the following conditions are not covered by this warranty: 1) improper installation or removal, 2) damaged by other than normal wear, 3) replaced for cosmetic purposes, or 4) returned with defaced date codes. CONDITIONS AND EXCEPTIONS This warranty shall apply only when the water heater is installed and operated in accordance with 1) all local fire codes and plumbing codes, ordinances and regulations, 2) the printed instructions provided with it, 3) good industry practices, and 4) proper safety practices such as but not limited to a properly sized drain pan if installed in an area where leakage from connections of the tank would result in damage to the area adjacent to the heater. In addition, a new temperature and pressure relief valve, certified by the American Gas Association must have been properly installed and piped to the nearest drain. This warranty shall apply only when the heater is: • owned by the original purchaser; • used at temperatures not exceeding the maximum calibrated setting of its thermostat; • not subjected to excessive water pressure fluctuations and not subject to an operating pressure greater than 150 P.S.I.; • filled with potable water, free to circulate at all times and with the tank free of damaging water sediment or scale deposits; • used ...
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