F5 displayed, machine will not start cleaning cycle, lock icon may be lit

Safety first: Unplug the machine before inspecting switches or wiring.

• Refit tanks: Remove both clean and dirty water tanks. Refit them carefully, ensuring they click into place and sit flush with the body.
• Check tank seals and lugs: Inspect the plastic lugs and tabs on the tanks that actuate the presence switches. If broken, the tank may not engage the switch; replace the tank.
• Inspect interlock switches: Locate the small microswitches or reed switches near the tank bays. Check that they are not physically broken or loose.
• Test switches: Use a multimeter to verify that the switches change state when the tank is inserted. Replace any faulty switch.
• Check wiring: Inspect the wiring from the interlock switches to the PCB for damage. Repair or replace the loom if necessary.