A.O. Smith Pro AOW-S400 User Manual (English)

Questions and Answers:

R
robbinsrichardAug 15, 2025
Why is my A.O. Smith Pro AOW-S400 Water Dispenser not producing soft water?
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  Alex JonesAug 15, 2025
  Your A.O. Smith Water Dispenser might not be producing soft water for several reasons: * The bypass valve could be in the bypass position. To fix this, place the bypass valve in the service position. * The appliance may be plumbed backward; double-check that it is plumbed correctly. * There may have been an extended power outage; reset the time of day and regenerate the unit. * The water hardness may have increased; re-test the water and re-enter a new setting number. * The unit might not be metering water. If there is no flow indicated with water usage, further inspection is needed.
K
Karl BlackAug 18, 2025
What to do if my A.O. Smith Pro AOW-S400 Water Dispenser has no read-out in display?
- B
  Brian BrooksAug 19, 2025
  If your A.O. Smith Water Dispenser has no read-out in the display, here are a few things to check: * First, ensure the electric cord is plugged in. * Verify there is electric power at the outlet and that the outlet is not controlled by a switch. * If the power source is working, the transformer may be defective. Test with a voltmeter for 12 VAC at the control. If it's less than 10 VAC, replace the transformer. * If 12 VAC is present at the controller, the circuit board may be defective, and you should replace the controller.
J
jgibsonAug 21, 2025
How to fix excess water in the brine tank of my A.O. Smith Water Dispenser?
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  Kimberly SmithAug 22, 2025
  To resolve excess water in the brine tank of your A.O. Smith Water Dispenser: * Check for a restricted, frozen, or pinched drain line. Remove any restrictions, thaw if frozen, or straighten the line. * Inspect the brine line, brine line flow control, or air check/draw tube for blockages. Clean the flow control, air check/draw tube, and brine line, removing any sediment from the brine cabinet. * Examine the injector assembly for clogs. Clean or replace the injector. If the throat is removed, replace the entire assembly.
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Courtney BakerAug 25, 2025
What to do if my A.O. Smith Pro AOW-S400 stays in regeneration?
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  cfoxAug 26, 2025
  If your A.O. Smith Water Dispenser remains in regeneration mode, consider the following: * Ensure the controller is fully pushed onto the cover plate. * The magnet disk may be defective and require replacement. * Check for any foreign objects in the main control valve and remove them. * A broken valve assembly could be the cause. If the motor is running, repair the valve assembly.
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Frederick BlackSep 7, 2025
What to do if my A.O. Smith Pro AOW-S400 Water Dispenser indicates flow when water is not being used?
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  qmarquezSep 7, 2025
  If your A.O. Smith Water Dispenser indicates flow even when water is not being used, it is likely that the household plumbing system has a leak. Repair the leak to resolve this issue.