E15 error; unit indicates a water shortage even though the reservoir appears full.

Safety first: Unplug the ice maker before reaching into the reservoir.

• Step 1 – Verify actual water level: Remove the reservoir cover and confirm the water is at the correct fill line for your Teendow model.
• Step 2 – Free the float: If a plastic float is present, move it up and down by hand. Clean any slime or scale that may cause sticking.
• Step 3 – Clean optical sensor: For optical sensors, gently clean the sensor window with a soft cloth to remove film or mineral deposits.
• Step 4 – Check switch and wiring: Test the float switch for continuity when raised and lowered. Inspect wiring back to the control board.
• Step 5 – Replace sensor/float: If E15 persists, replace the water level float switch or optical sensor with a Teendow-compatible part.