TM-9-2540-207-14-P
HEATER, VEHICULAR COMPARTMENT, MODEL: A20
TECHNICAL MANUAL; OPERATOR, FIELD, AND SUSTAINMENT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2007
TM-9-2540-207-14-P - Page 166 of 288
TM 9-2540-207-14&P
6-2
6.1.2
“E” Codes - Operating Errors
Operating Error codes are used to display faults which have a direct effect on the heater
but which are generally caused by the vehicle or testing system. (i.e. external to heater)
E1
Low Voltage
E2
Low Fuel Pressure
E3
Low Burner Air Flow
E4
Reverse Burner Air Flow
E5
Inlet Over Pressure
E
6
System Voltage
6.1.3
“F” Codes - Operating Faults
Operating Faults are heater failures caused by operation of the heater outside the
standard heater operating parameters.
F1
Ignition Overtime
F2
Burner Flame Out
F3
Heat Limit
F4
Vent Air Over Heat
F5
Over Current
F6
Ambient Over Temperature
F7
Exhaust Over Temperature
F
8
Ignition Flame Out
6.2
Warning & Shutdown Faults
The three types of Fault Codes (“C”, “E”, and “F”) can be broken into two categories: Warning
Faults, and Shut-Down Faults. (ref. Table 6-1 and Table 6-2).
If the Control Box Lamp begins to flash, the heater is signaling that an abnormal condition is
present.
The appropriate maintenance technician can correct this condition by referencing the
heater diagnostic display and instructions in Section 6 (TROUBLESHOOTING) of this manual.
If a Warning Fault in Table 6-1 is encountered, the heater will alternately display the fault code
and the current run code (07 or 14) on the Diagnostic Display. If possible, the heater will adjust
its operation to compensate for the condition. If the condition continues and operation is no
longer possible, the heater will enter Purge mode, and steadily display the fault. With the
exception of the Low Fuel Pressure and Fuel Pressure Sensor Fault warnings, the Control Box
Lamp will not flash if a Warning fault is displayed. In the case of a Low Fuel Pressure Fault, the
Control Box Lamp will flash in a cycle comprising two (2) quick flashes followed by a two (2)
second delay.
In the case of a Fuel Pressure Sensor Fault, the Control Box Lamp will flash in a
cycle comprising three (3) quick flashes followed by a two (2) second delay.
If a Shut Down fault in Table 6-2 is encountered, the heater will automatically enter shutdown
mode.
In shutdown mode the heater will purge combustion and vent air for a period of 3
minutes to clear out combustible fumes and excess heat.
During this time the control box
controls are locked out; the Diagnostic Display will display the fault code; and the Control Box
Lamp will flash in a cycle comprising one (1) flash followed by a two (2) second delay.
Once the
shutdown purge cycle is completed the heater will automatically switch off and can be restarted.
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