E04 error and the pump will not run; spa may not respond to start commands.

Safety first: Unplug the spa before touching the pump or opening any panels. Water and electricity are a dangerous combination.

• Check for obstructions:
  • Remove the filter and visually inspect the suction area for debris.
  • Access the circulation/jet pump and remove the pump cover if possible.
  • Manually spin the impeller with a non-metallic tool; it should turn freely.
• Inspect wiring:
  • Locate the pump connector on the control box PCB.
  • Check for discoloration, melting, or loose pins.
  • Reseat the connector firmly.
• Test restart: Plug the spa back in and attempt to start filtration or jets. If E04 appears immediately and the pump does not even hum, the motor may be shorted.
• Replace pump if seized or shorted:
  • If the impeller will not turn or the motor trips protection instantly, replace the complete Avenli pump assembly with the correct model for your spa.
  • Ensure all O-rings and gaskets are correctly seated to prevent leaks.
• If wiring damage is found: Burnt connectors or PCB traces indicate the control box assembly may also need replacement.