Gefran controller: The top display is showing Sbr. What does this mean?

This is usually an indication of a faulty thermocouple temperature sensor (open circuit or faulty cable).

Solution:

Step 1: If input type is known (eg. Thermocouple type J), change tyP parameter.

1. Press and hold the button until is displayed;
2. Press twice - is displayed; using configure to a value in the table below:
   

A comprehensive manual can be found in the operator's manual.

Test:

1. Remove the temperature sensor connections from terminals 1 and 2 of the temperature controller:
   
2. Connect a link between terminals 1 and 2 of the temperature controller:
   
3. Change the input type to thermocouple type J:
   1. Press and hold the button until is displayed;
   2. Press twice - is displayed; using configure to 0.
   3. Press and hold until you return to the main display. This is the display after
   4. If the PV (top value of the display) displays the ambient temperature of the cabinet, the sensor is faulty and requires replacement/repair. Contact us for a replacement or repair of the temperature sensor.
   5. If the sensor still indicates SBR contact technical support.