A.O. Smith CAHP-120 Series

Questions and Answers

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victorpierceAug 9, 2025
Why is there no hot water from my A.O. Smith CAHP-120 Water Heater?
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  Ryan MccormickAug 10, 2025
  If you're not getting hot water from your A.O. Smith water heater, try these steps: First, open the top service panel and the door of the upper element, and then press the reset button. Also, check the water heater and the hot water outlet tube for any leakage. For detailed maintenance, refer to the Maintenance Instructions.
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valerie55Aug 17, 2025
What to do if my A.O. Smith CAHP-120 Water Heater is leaking?
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  nancyshortAug 18, 2025
  If your A.O. Smith water heater is leaking, there could be several reasons. Check the drain valve to ensure it's completely closed. If the T&P relief valve outlet is leaking, it might be due to high water temperature or high water pressure. For closed systems, install a second T&P relief valve with a lower pressure setting than the first. To relieve heat expansion, install an expanded tank with appropriate pressure.
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vjohnsonAug 25, 2025
How to fix noise from A.O. Smith CAHP-120 Water Heater?
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  christopher80Aug 26, 2025
  If your A.O. Smith water heater is making noise, it could be due to scale buildup. Clean the scale from the bottom of the tank and the surface of the heating elements. For detailed maintenance, refer to the Maintenance Instructions.
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Rebecca SmithSep 1, 2025
What to do if I see diagnostic codes on my A.O. Smith CAHP-120?
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  monicacamachoSep 1, 2025
  If your A.O. Smith Water Heater shows diagnostic codes, disconnect the power and charge enough water, and then connect the power supply. Some codes will recover automatically. If the issue persists, turn off the unit and clean the evaporator.