Display shows HI or H1 and unit may run continuously without reaching set temperature.

Safety: Disconnect power before inspecting wiring or sensors.

• Confirm cabinet temperature: Use a separate thermometer to verify that the interior is not actually extremely hot. If the display shows HI but the cabinet is cool, the sensor circuit is likely open.
• Inspect thermistor wiring: Locate the cabinet thermistor and follow its wire to the control board. Look for breaks, pinched sections, or a disconnected plug.
• Check connector seating: Ensure the thermistor connector is fully inserted into the control board socket.
• Measure resistance: With the thermistor unplugged from the board, measure resistance across its leads. Infinite resistance indicates an open sensor that must be replaced.
• Replace the thermistor: Install an OEM Avanti cabinet thermistor and secure it properly.
• Control board diagnosis: If the sensor and wiring are good but HI remains, the control board may not be reading the sensor and will require replacement.