Heater indicator flashes or E6 displayed; water does not heat or unit shuts off heater quickly.

Safety first: Unplug the unit and allow it to cool completely before working on the heater assembly.

• Check for scale buildup: Hard water can coat the heater. If accessible, remove the in-line heater and inspect for heavy limescale. Descale using a manufacturer-approved descaling solution or replace if severely blocked.
• Test heater element: Use a multimeter to measure resistance across the heater terminals. An open circuit indicates a failed element that must be replaced.
• Inspect thermal cutoff: Many heaters have a one-shot thermal fuse. Check continuity across the thermal cutoff. If open, replace with the same temperature and current rating and investigate overheating causes (blocked flow, running dry).
• Check temperature sensor: Measure resistance of the NTC sensor at room temperature and compare to Electrolux service specs. A short or open sensor will trigger E6.
• Control board relay: If heater and sensor test good but E6 persists, the heater relay or triac on the control board may be defective and require board replacement.