Washer may fill and start but stops with F08; sometimes associated with heater or water level issues.

Safety: Disconnect power and water. Avoid touching PCB tracks with bare hands.

F08 often indicates the control detects an inconsistency between water level and heater status.

• Check pressure system: Inspect and clean the pressure hose and chamber as described for F04. Ensure the pressure switch clicks when gently pressurized.
• Verify heater wiring: Confirm heater connections are secure and not shorted to chassis. Check for signs of arcing or melting at the terminals.
• Test heater element: Measure resistance and insulation to earth. A heater leaking to earth can cause F08. Use a megohmmeter if available; otherwise, visually inspect for cracks or heavy limescale.
• Inspect PCB: Look for a stuck or welded heater relay on the main board (burnt contacts, discoloration). If found, the PCB should be replaced.

Because F08 involves safety-related circuits, if you cannot clearly identify and correct the fault, arrange for a qualified technician to test the heater and control board properly.