# Rectifying errors

Text display (n) | Problem | Corrective measure
--- | --- | ---
PNK | Failed to establish Bluetooth® connection to the GRL 600 CHV or GRL 650 CHVG rotary laser | Briefly press the on/off button on the rotary laser to close the error message. Restart the connection setup. If it is not possible to establish a connection, please contact a Bosch customer service agent.
ERR | Calibration of the GRL 600 CHV or GRL 650 CHVG rotary laser failed | Read and observe the operating instructions for the GRL 600 CHV or GRL 650 CHVG.
CenterFind mode or CenterLock mode failed | Press any button to close the error message. Check the position of the rotary laser and laser receiver before restarting the function.
LR 65 G:
ERR and CL in alternation | CenterFind mode cannot be started because the rotary laser is already working in CenterLock mode. | Set CenterFind mode on both laser receivers and restart the function.
ERR and CF in alternation | CenterLock mode cannot be started because the rotary laser is already working in CenterFind mode. | Set CenterLock mode on both laser receivers and restart the function.