620 – HIHI Current net calorific value
Yellow alarm.
Associated parameter 2.1210.009
Cause
Corrective action
Fuel calorific value has
exceeded the second limit value.
u
Check gas quality if feasible.
621 – LO Nox Value
Yellow alarm.
Associated parameter 2.3050.024
Cause
Corrective action
NOx emissions have fallen below
the first limit value.
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor.
4. Check emissions.
622 – LOLO Nox value
Yellow alarm.
Associated parameter 2.3050.025
Cause
Corrective action
NOx emissions have fallen below
the second limit value.
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor.
4. Check emissions.
623 – HI Nox Value
Yellow alarm.
Associated parameter 2.3050.026
Cause
Corrective action
NOx emissions have exceeded
the first limit value.
1. Check gas quality if feasible.
2. Check NOx sensor.
3. Check emissions.
624 – HIHI Nox value
Yellow alarm.
Associated parameter 2.3050.027
Cause
Corrective action
NOx emissions have exceeded
the second limit value.
1. Check gas quality if feasible.
2. Check NOx sensor.
3. Check emissions.
MS15027/02E 2015-04
| Troubleshooting | 137
TIM-ID: 0000044567 - 003
