E07 displayed and the spa will not heat; temperature reading may be erratic or stuck.

Safety first: Disconnect power before handling any sensors or wiring.

• Locate ambient sensor:
  • On many Avenli models, the ambient air temperature sensor is mounted near the control box or air intake.
  • Identify the small probe or thermistor and its cable.
• Inspect cable and connector:
  • Check for cuts, abrasions, or crushed sections.
  • Unplug and replug the sensor connector at the control PCB to clean contacts.
• Check sensor placement:
  • Ensure the sensor is not touching hot components like the heater tube.
  • Reposition it to its original clip or bracket so it measures true ambient air.
• Replace sensor if damaged:
  • If the probe is broken or the cable insulation is cracked, replace with a compatible Avenli ambient temperature sensor.
• If E07 persists: The sensor input on the main control PCB may be faulty, requiring control box replacement.