Printed in Germany / M-MT-BOS
• Edition 11.99 • # 231 763
112 … 112
Code Meaning
63H Internal device fault
64H Internal device fault
65H Internal device fault
67H Internal device fault
68H Air servomotor, incorrect acknowledgement (check cable and plug,
servomotor and air damper mechanism)
69H Gas servomotor, incorrect acknowledgement (check cable and plug,
servomotor and gas damper mechanism)
6AH Air servomotor position out of tolerance (check cable and plug,
servomotor and air damper mechanism)
6BH Gas servomotor position out of tolerance (check cable and plug,
servomotor and gas damper mechanism)
6CH Internal device fault
6DH Internal device fault
6EH Servomotors have been interchanged or connected incorrectly
6FH Error in burner recognition / zero reference run (incorrect coding plug,
check cable and plug)
70H Internal device fault
71H Internal device fault
73H Internal device fault
74H Internal device fault
75H Internal device fault
76H Internal device fault
77H Internal device fault
78H Internal device fault
79H Internal device fault
Error messages