E15 displayed, unit indicates drain blockage or high backpressure

Safety: During regeneration, drain water can be discharged at high flow. Ensure the drain line is secure before testing.

• Inspect drain hose: Follow the entire length of the Cillit drain hose. Straighten any kinks and remove sharp bends. Shorten the hose if it exceeds the maximum length specified by Cillit.
• Check termination: Ensure the hose discharges into an open drain with an air gap. Do not insert the hose deeply into a standpipe or trap, which can cause backpressure.
• Clear blockages: Disconnect the hose from the valve and blow through it or flush with water to remove sludge or scale. Replace if heavily fouled.
• Check for freezing: In cold climates, verify that the drain line is not routed through unheated spaces where it can freeze. Thaw gently and insulate as needed.
• Test regeneration: Reconnect the hose, secure it, and run a manual regeneration. Confirm that drain flow is strong and that E15 does not reappear.