Display shows E7 and backwash/regeneration stops prematurely

Safety first: Put the softener in BYPASS and unplug power. Be prepared for water discharge when disconnecting the drain line.

Steps to troubleshoot E7 (drain flow):

• 1. Inspect drain hose: Follow the Aquasana drain line from the control head to the drain. Straighten any kinks and ensure the end is not submerged or blocked.
• 2. Check for freezing: In cold climates, ensure the drain line is not routed through unheated spaces where it can freeze.
• 3. Disconnect and flush: Remove the drain line from the control head. Attempt to blow through the hose; if restricted, flush it with water or replace it.
• 4. Clean drain port and flow control: At the control head, inspect the drain port and any flow control insert for debris. Rinse and clear any obstructions.
• 5. Reconnect and test: Reattach the drain line, restore water, and run a manual regeneration. Observe the drain flow; it should be strong and steady during backwash.
• 6. If E7 persists: Internal valve passages may be obstructed or damaged. The control valve head may require professional service or replacement.