Washer-dryer fills and drains repeatedly without heating, F08 displayed.

Safety first: Unplug the appliance and ensure it is dry before inspection.

Inspect heater insulation:

• Visual check: Remove rear panel and inspect heater terminals for signs of arcing, carbon tracking, or moisture.
• Insulation test (advanced): Using a megohmmeter if available, test between each heater terminal and earth. Low insulation resistance indicates a leakage to ground and the heater should be replaced.
• Dry the area: If there are signs of condensation or leaks, dry the heater area thoroughly and check for tub or hose leaks above.

Control board: If the heater is not shorted and wiring is intact, the heater relay on the control board may be stuck. In that case, replace the main control module.