TM 9-2540-207-14&P
F3 - HEAT LIMIT
F3
Vent Outlet temperature has exceeded the upper temperature limits of 340F (171C)
CHECK/POSSIBLE CAUSE
REF.
REPAIR
1
Check that all dampers in
Open all dampers fully
vehicle are open
Switch heater to Low mode
2
Check for obstructions in front of
Remove obstructions
Heater Ventilation Outlet
Switch Heater to Low mode
3
Check all Ducting connections
vehicle
Install ducting correctly
TM
Switch heater to Low mode
2.2
2.3
2.7
4
Defective Heat Exchanger
5.4.1
Replace Heat Exchanger
Restart Heater
6-23
