Display shows ERR1 and softener will not start a regeneration cycle

Safety first: Unplug the softener from power before removing covers. Shut off water at the inlet bypass valve and relieve pressure by running a nearby cold faucet.

Steps to check:

• 1. Verify rotor movement: Remove the top cover. Locate the rotor/valve motor on the control valve head. With power restored briefly, start a manual regeneration. If the motor hums but the rotor does not turn, unplug the unit and inspect for mechanical binding or debris in the rotor and disc assembly.
• 2. Inspect the rotor and disc: Remove the screws holding the valve cover. Gently pull off the rotor and disc. Look for scoring, cracks, or foreign material. Clean the sealing surfaces and ports with a soft cloth. Reinstall carefully, ensuring the rotor shaft seats fully.
• 3. Check the motor and wiring: With power disconnected, inspect the motor harness connector for corrosion or loose pins. Use a multimeter to check motor coil resistance (compare to Whirlpool service specs). Replace the rotor/valve motor if open or shorted.
• 4. Inspect position switch/sensor: Some Whirlpool softeners use a cam-operated micro-switch or position sensor. Verify the cam is intact and the switch actuates as the rotor turns. Replace the switch/sensor if it does not change state when actuated.
• 5. Reassemble and test: Reinstall the valve cover and motor. Restore water and power. Initiate a manual regeneration and confirm ERR1 clears and the rotor indexes through all positions.

When to call a technician: If the rotor is seized in the valve body or the valve body is cracked or leaking, professional replacement of the entire control valve assembly is recommended.