Washer-dryer will not start a cycle; door symbol flashes and cycle cancels shortly after pressing start.

Safety first: Unplug the appliance and turn off the water supply before any disassembly. Do not bypass the door lock for testing while the machine is powered.

Step-by-step checks:

• Inspect the door and latch: Open and close the door firmly. Check the metal/plastic latch hook on the door for cracks, bending, or looseness. If damaged, replace the door latch hook.
• Check the door seal area: Ensure no clothing, coins, or debris are trapped around the door opening or gasket preventing full closure.
• Access the door lock (interlock): Remove the front retaining band of the door gasket and gently pull the gasket back near the lock area. Unscrew the door lock assembly from the front panel.
• Test the door lock: With a multimeter set to continuity, test the lock terminals according to a Candy wiring diagram (usually 3 terminals: common, lock, and sense). If the lock coil is open or continuity is not as specified, replace the door lock assembly.
• Inspect wiring: Check the harness from the door lock to the main PCB for broken wires, burn marks, or loose connectors. Reseat all connectors firmly.
• Reassemble and test: Refit the lock, gasket, and retaining band. Plug in the machine and test a short wash cycle.

When to call a technician: If the door lock and wiring are good, the fault may be on the main control board (relay or triac). Board-level diagnosis and replacement should be done by a qualified technician.