Display shows Hi and the temperature cannot be adjusted higher or reads extremely high.

Safety: Disconnect power before working inside the cabinet.

• Inspect sensor wiring: Locate the cabinet temperature sensor and follow its wiring to the main control board. Look for breaks or loose connectors.
• Test sensor: Use a multimeter to check for continuity and resistance. Infinite resistance indicates an open sensor.
• Reconnect or replace: Reseat the connector or replace the sensor with a TYLZA-compatible part if open.
• Test operation: Restore power and verify that the display shows a realistic temperature and 'Hi' clears.