A.O. Smith SGS-28 - User Manual

Questions and Answers

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ocopelandAug 16, 2025
Why is my A.O. Smith Water Heater not producing enough hot water?
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  lisa83Aug 16, 2025
  If your A.O. Smith Water Heater isn't producing enough or any hot water, consider the following: * Ensure the water heater is turned on. * Verify the isolator is on and receiving power, the controller's ON/OFF switch is in the 'I' position, and the electrical connector block is powered, with a measured voltage of 230 VAC (-15%, +10%). * Reduce hot water usage and allow the water heater time to reheat. * Make sure the controller is in the ON position. * Increase the temperature setting.
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Bryan HernandezAug 22, 2025
What to do if I smell gas from my A.O. Smith Water Heater?
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  Diane ZimmermanAug 22, 2025
  If you smell gas, immediately close the main gas valve, do not operate any switches or use open flames, ventilate the boiler room, and contact your installation engineer or local gas company.
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darrell08Aug 26, 2025
Why is the display off on my A.O. Smith Water Heater?
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  Justin AndradeAug 26, 2025
  If the display on your A.O. Smith Water Heater is off: * Ensure the water heater is turned on. * Check the isolator is ON and has power, the controller's ON/OFF switch is in position I, and the electrical connector block has power, ensuring the voltage is 230 VAC (-15%, +10%). * If there are defective fuses, contact your installation engineer to replace them.
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sherry37Aug 28, 2025
What causes explosive ignition in A.O. Smith Water Heater?
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  Connie SullivanAug 28, 2025
  Explosive ignition in your A.O. Smith Water Heater can be due to incorrect supply pressure or CO2 levels, which should be set correctly. Another cause can be a contaminated burner, which should be cleaned.
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hunterdanielleAug 31, 2025
How to fix A.O. Smith Water Heater S01 error?
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  staylorAug 31, 2025
  If your A.O. Smith Water Heater shows an S01 error (blocking error) indicating an open circuit from temperature sensor T2, it could be due to the sensor not being correctly connected, in which case you should connect the sensor lead to JP3. Alternatively, the cable or sensor may be damaged, requiring replacement.
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David FosterSep 3, 2025
How to troubleshoot A.O. Smith Water Heater S02 error?
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  Kyle NobleSep 3, 2025
  If your A.O. Smith Water Heater displays an S02 error (blocking error) indicating an open circuit from sensor 1 of temperature sensor T1, it might be due to the sensor not being properly connected; ensure the sensor lead is connected to JP5. It could also be caused by a damaged cable or a defective sensor, which would need to be replaced.
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Robert MurphySep 6, 2025
What does S03 error mean on A.O. Smith Water Heater?
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  Melissa MillsSep 6, 2025
  If your A.O. Smith Water Heater shows an S03 error (blocking error) indicating an open circuit in sensor 2 of temperature sensor T1, it may be because the sensor is not correctly connected; connect the sensor lead to JP5. Another possibility is a damaged cable or defective sensor, which would require replacement.
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Charles PittmanSep 9, 2025
What to do for A.O. Smith Water Heater S04 error?
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  Ryan MejiaSep 9, 2025
  If your A.O. Smith Water Heater displays an S04 error (blocking error) indicating an open circuit from dummy 1, it may be caused by the dummy not being correctly connected; connect the dummy sensor leads to JP4. Alternatively, the dummy sensor might be defective and need replacement.
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christopherwebbSep 10, 2025
What to do if my A.O. Smith Water Heater is leaking water?
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  Amy WellsSep 12, 2025
  If you notice water leaking from your A.O. Smith Water Heater: * Tighten any loose threaded water connections. * Ensure the condensation water discharge is functioning correctly. * Identify the source of the leak, as it may originate from another water heater or pipe segment nearby. * If the leak comes from the water heater tank itself, consult the supplier or manufacturer.
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Jeff AndersonSep 12, 2025
How do I fix A.O. Smith Water Heater S05 error?
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  Brittney MorenoSep 12, 2025
  If your A.O. Smith Water Heater shows an S05 error (blocking error) indicating an open circuit from dummy 2, it could be that the dummy is not correctly connected; connect the dummy sensor leads to JP4. It's also possible that the dummy sensor is defective and needs to be replaced.