E05 displayed and softener does not advance through regeneration stages

Safety first: Unplug the unit before accessing the control board. Avoid static discharge by touching a grounded metal object before handling electronics.

• 1. Power cycle the unit: Disconnect power for 5 minutes, then reconnect. This can clear transient faults.
• 2. Inspect wiring harnesses: Remove the control cover and verify all connectors between the display, main PCB, and motor are fully seated. Reseat any loose plugs.
• 3. Check for visible damage: Look for burnt components, discoloration, or corrosion on the Rayne control board. If present, the board should be replaced.
• 4. Verify correct programming: Using the user manual, enter the programming mode and confirm hardness, capacity, and time settings are correct. Incorrect settings can cause abnormal regeneration behavior.

When to call a technician: If E05 returns after a reset and wiring check, the control board likely needs replacement and should be ordered and installed by a Rayne-authorized technician.