E13 appears and the unit will not spray; audible clicking from inside the base.

Safety first: Unplug the cleaner and empty the solution tank.

• Locate the solenoid valve: It is typically installed between the pump and the spray manifold, with two wires attached.
• Check for mechanical sticking: Gently tap the valve body with a screwdriver handle to free a stuck plunger. Do not strike hard enough to crack the housing.
• Inspect tubing: Remove and inspect the short hoses connected to the valve for blockages or crystallized detergent. Soak in warm water if necessary.
• Verify wiring: Ensure the solenoid connector is fully seated and that wires are not damaged.
• Functional test: With the unit reassembled and powered (and observing electrical safety), listen for a distinct click from the valve when the trigger is pulled. No click suggests a failed solenoid or control output; replace the valve if it receives voltage but does not actuate.