Display shows E5 and suction motor does not start when power is turned on.

Safety first: Unplug the machine. Capacitors in motor circuits can retain charge; avoid touching bare terminals.

• Check for obvious damage: Smell for burnt odour near the motor housing. Listen for any rattling that might indicate broken fan blades.
• Inspect carbon brushes: Access the vacuum motor (usually under the top cover). Remove brush caps and check brush length. If brushes are worn below the manufacturer’s minimum, replace them as a set.
• Check motor continuity: With a multimeter, measure resistance across the motor terminals. An open circuit indicates a failed motor.
• Thermal protector: Some Numatic motors have an inline thermal cut-out. Check continuity across the protector. If open when cold, it may be faulty.
• Inspect wiring and relay: Ensure all spade connectors are tight and not heat-damaged. If the motor and wiring test OK but E5 remains, the motor relay or PCB is likely faulty.
• Reassembly: Refit all covers securely before testing. If you are not comfortable working around mains-voltage motors, contact a professional.