Some dirt has got stuck in the gap around the browning unit or a foreign object has got caught inside it.
Clean the salamander grill and/or remove the obstruction.
The salamander grill cannot be extended.
Clean the salamander grill and/or remove the obstruction.
Check whether the circuit breaker has tripped.
If the problem cannot be resolved, disconnect the appliance from the mains power supply for approx. 1 minute.
To disconnect the appliance from the mains power supply, turn off the relevant circuit breaker or remove the fine-wire fuse completely. Or switch off the residual current device.