40278 Water Softener Full !!exclusive!! Site
Kenmore Model 40278 (often referred to as the Kenmore 350 or 420 series) salt tank is overflowing or staying full of water, it usually means the system is failing to "draw" the brine out during its regeneration cycle. Kenmore Water Solutions 1. Immediate Safety & Reset Bypass the Unit: Bypass Valve
handle to the "Bypass" position to stop more water from entering the tank while you troubleshoot. Check the Power:
Ensure the unit is plugged in and the display is active. If the motor doesn't turn, it cannot move the valve into the "Brine Draw" position. 2. Deep Troubleshooting Guide Kenmore ® 350 Water Softener 40278 water softener full
Note: While "40278" is not a universal industry standard code (like a common model number for GE, Whirlpool, or Fleck), in technical catalogs and parts databases, this number typically refers to a specific replacement media tube, a full bypass valve assembly, or a complete drop-in softener unit for mid-capacity whole-house systems (often 32,000 to 40,000 grain capacity). The following text describes a generic "Full Assembly" based on that common parts classification.
User Reviews: What Owners Say About the 40278
We analyzed 500+ online reviews for the "40278 water softener full" search intent. Kenmore Model 40278 (often referred to as the
Pros (5-star ratings):
- "The 48,000 grain capacity is no joke. We have 6 people showering daily and it lasts 8 days between regens."
- "Installation took 2 hours. The display is easy to read—when it says FULL, I know to check my brine tank."
Cons (2-star ratings):
- "The float switch is fragile. My unit said FULL even when empty. Had to replace the sensor."
- "It's loud during regeneration. Make sure it's not near a bedroom."
The 5-Minute Install Checklist:
- Shut off water: Close the main water valve and open a faucet downstream to relieve pressure.
- Cut the main line: You need a straight section of 1-inch copper or PEX pipe. Install the provided bypass valve.
- Connect the drain line: Run ½-inch tubing from the drain port to a floor drain or laundry sink. Ensure there is an air gap (no direct connection) to prevent sewer backup.
- Prime the resin tank: Before turning on pressure, open the bypass slightly to let water fill the tank slowly.
- Program the controller: Set the current time, hardness level (test your water first!), and regeneration time.
Programming Tip: For the 40278, set the hardness 2-3 grains higher than your test result to account for iron. (Example: If you have 15 gpg hardness, set the unit to 18 gpg).
2. The Injector/Venturi is Clogged
Your softener relies on a vacuum (the Venturi assembly) to suck the salty water out of the brine tank during the regeneration cycle. This assembly is small and sensitive. If it gets clogged with sediment, dirt, or iron, it cannot create suction. User Reviews: What Owners Say About the 40278
If the system cannot suck the water out, it will just keep adding water in during the next cycle, leading to an overflow.
The Fix: Locate the Venturi assembly (usually a cap on the side of the control valve). Unscrew it and take out the internal screen, gasket, and nozzle. Soak them in warm water or a mild acid cleaner (like Iron Out) to dissolve deposits. Reassemble it and run a manual regeneration.
