E16 displayed and the Amfa4000 reports a drain/backwash fault

Safety first: Disconnect power and close the inlet valve. Be prepared for discharge of salty water when opening the drain line.

• 1. Inspect drain hose routing: Ensure the drain hose runs downhill or with minimal rise to the drain point and is not kinked or crushed behind the unit.
• 2. Check drain termination: Verify the air gap or standpipe is not blocked by debris. Clear any obstructions.
• 3. Clean drain port: Disconnect the drain hose at the Amfa4000 valve head and inspect the port for scale or debris. Flush with clean water until flow is unobstructed.
• 4. Thaw frozen sections: In cold climates, check external drain runs for freezing. Gently thaw and insulate as needed.

Reconnect the drain line securely, restore water and power, then run a manual regeneration. If E16 recurs, the internal drain piston or seal pack may be worn and require service.