MTU 12 V 4000 L62FB Operating Instructions Manual page 118

618 – LOLO Current Heat Value of Fuel
Yellow alarm.
Associated parameter 2.1210.007
Cause
Fuel calorific value has undershot
the second limit value
619 – HI Current Heat Value of Fuel
Yellow alarm.
Associated parameter 2.1210.008
Cause
Fuel calorific value has exceeded
the first limit value
620 – HIHI Current Heat Value of Fuel
Yellow alarm.
Associated parameter 2.1210.009
Cause
Fuel calorific value has undershot
the second limit value
621 – LO NOx Value
Yellow alarm.
Associated parameter 2.3050.024
Cause
NOx emissions have undershot
the first limit value
622 – LOLO NOx Value
Yellow alarm.
Associated parameter 2.3050.025
Cause
NOx emissions have undershot
the second limit value
118 | Troubleshooting | MS150098/02E 2016-11
Corrective action
u Check gas quality if feasible.
Corrective action
u Check gas quality if feasible.
Corrective action
u Check gas quality if feasible.
Corrective action
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor.
4. Check emissions.
Corrective action
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor.
4. Check emissions.