TM 9-2540-207-14&P
E1 - LOW VOLTAGE
E1
Voltage supplied top the heater is below normal voltage limits (19VDC - 28VDC normal range)
CHECK/POSSIBLE CAUSE
REF.
REPAIR
1
Check the source voltage or
If voltage is less than 19VDC then Operate
battery levels.
heater with vehicle running
2
With heater off, check for free
5.2.6
If impeller does NOT spin freely, Replace
rotation of the Vent impeller by
5.2.4
Vent Fan Motor AND Vent Fan Impeller
manually spinning by hand
Restart Heater
3
Check electrical input
2.5
Reconnect all electrical connections to
connections for loose wires
5.5.6
Power Wiring Harness
Restart Heater
4
Defective Electronic Vent Fan
5.2.5
Replace Electronic Vent Fan Driver Board
Driver Board
Restart Heater
5
Defective Power Wiring Harness
5.5.6
Replace Power Wiring Harness
Restart Heater
6-15
