Display shows E17; unit will not start; often after a tripped household breaker.

Safety first: Unplug the unit. If you suspect a ground fault, do not continue to operate the cleaner until the fault is resolved.

• Dry the unit: If the cleaner was used in an excessively wet environment or stored damp, allow it to dry in a warm, dry area for 24–48 hours.
• Inspect cord and plug: Look for cuts, nicks, or crushed areas on the power cord. Replace the cord if any damage is found.
• Check for internal leaks: Open the housing and inspect for signs of water leakage around the pump, hoses, and tanks. Repair leaks and dry all components thoroughly.
• Insulation test (for professionals): Use a megohmmeter to test insulation resistance between live parts and chassis. Low resistance indicates a leakage path that must be corrected.
• Ground fault circuit: If no physical fault is found, the internal ground fault detection circuit on the PCB may be overly sensitive or defective and require replacement.