Internal unit element temperature sensor error “F3” (Sendo SFSU 46K) (includes: input, middle segment, export)

1. Check if the sensor resistance is normal, otherwise replace it.

2. Check if the sensor cable is short-circuited or open-circuited, and if the fiss is well adjusted, if a connection to the board has been unstuck, and repair accordingly.

3. When steps 1 and 2 are normal, then the components or IC are damaged, and the electronic board needs replacing.