Figure 7.4.xii Pressure Not Maintained
14. If the air pressure sensor fails, or the pressure has reached its limit set through expansion
option 40.8, a message will appear on the draft control screens. Expansion option 40.8 sets
the maximum pressure tolerance before a fault occurs; if the current stack pressure exceeds this
maximum change from the commissioned stack pressure over 2 minutes, than an error message
will appear.