A.O. Smith ADM - 40 - User Manual

Questions and Answers

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kelleylisaAug 11, 2025
Why is my A.O. Smith ADM - 40 Water Heater not producing hot water?
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  Felicia GonzalezAug 11, 2025
  If your A.O. Smith Water Heater isn't producing hot water, it could be due to a few reasons: * **No supply voltage:** Check if the isolator is ON, if there is power to the isolator and to the electrical connector block, if there is power to the burner control, and check the fuse in the burner control. Ensure the measured voltage is 230 VAC (-15%, +10%). If issues persist, contact your installation engineer. * **Blockage in the flue gas discharge:** Trace and remove any blockage, then reset the flue gas thermostat.
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Susan KochAug 17, 2025
What to do if my A.O. Smith ADM - 40 is leaking?
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  Mike BaldwinAug 17, 2025
  If you notice water leaking from your A.O. Smith Water Heater, here's what to check: * **Threaded Connection:** Try tightening the threaded connection. * **Other Appliances or Pipes:** Look for leaks from nearby water appliances or pipe segments and trace them to their source. * **Appliance's Tank:** If the tank itself is leaking, consult the supplier and/or manufacturer. * **Condensation:** Wait until the water in the boiler has reached the set temperature before using tap water.
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George LoveAug 23, 2025
Why is my A.O. Smith ADM - 40 Water Heater providing insufficient hot water?
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  Taylor YoderAug 23, 2025
  If your A.O. Smith Water Heater isn't providing enough hot water, it might be because: * **Temperature Setting:** The water temperature setting (Tset) may be too low. Try setting the control thermostat to a higher value. * **Hot Water Usage:** You may be using hot water faster than the appliance can heat it. Reduce hot water consumption and allow the appliance time to heat up. If the problem continues, check if the high-limit thermostat is switching and ensure the circulation and/or top to bottom circulation pump are working.
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Christopher CarrollAug 29, 2025
What to do if I smell gas near my A.O. Smith Water Heater?
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  Lisa FoxAug 29, 2025
  If you smell gas, it could be due to a gas leak. Immediately close the main gas valve, avoid operating any switches or using open flames, and ventilate the boiler room. Contact your installation engineer or local gas company right away.
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Robert WestSep 4, 2025
How to fix explosive ignition in A.O. Smith Water Heater?
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  pnguyenSep 4, 2025
  An explosive ignition or poor flame profile in your A.O. Smith Water Heater can be caused by several factors: * **Incorrect Pressure:** The supply pressure and/or burner pressure may be incorrect. Set the correct supply pressure and/or burner pressure. If ignition doesn't improve, consult your installation engineer. * **Contaminated Burner/Orifice:** The burner(s) or orifice(s) may be contaminated. Clean the burner(s) and orifice(s). * **Inadequate Air Supply:** The air supply may be insufficient. Improve the air supply by providing better ventilation in the boiler room.