MTU MS15027/02E Operating Instuctions page 137

620 – HIHI Current net calorific value
Yellow alarm.
Associated parameter 2.1210.009
Cause
Fuel calorific value has
exceeded the second limit value.
621 – LO Nox Value
Yellow alarm.
Associated parameter 2.3050.024
Cause
NOx emissions have fallen below
the first limit value.
622 – LOLO Nox value
Yellow alarm.
Associated parameter 2.3050.025
Cause
NOx emissions have fallen below
the second limit value.
623 – HI Nox Value
Yellow alarm.
Associated parameter 2.3050.026
Cause
NOx emissions have exceeded
the first limit value.
624 – HIHI Nox value
Yellow alarm.
Associated parameter 2.3050.027
Cause
NOx emissions have exceeded
the second limit value.
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.
Corrective action
1. Check gas quality if feasible.
2. Check NOx sensor.
3. Check emissions.
Corrective action
1. Check gas quality if feasible.
2. Check NOx sensor.
3. Check emissions.
MS15027/02E 2015-04 | Troubleshooting | 137