Locking fault: To unlock Hold up and down arrow keys pressed simultaneously for 3 s. For more information see operating instr. (Boiler locked. Contact a qualified heating engineer)
Remedy
Diagnose and remedy the locking fault. Check the complete system, including sensors and harnesses.
When remedied and system checked, turn the boiler power off and on again.
Fault condition 2981 will appear, the boiler is still in super lock-out
Press the up and down arrows simultaneously for 3 seconds.
Immediately after 22 seconds have elapsed, perform an additional reset by pressing the up and down arrows simultaneously for 3 seconds.
Super lock-out is remedied, boiler returns to normal operating condition.
Fault history is now available, double check the last 10 faults to confirm the fault has been remedied