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 36 of 288
TM 9-2540-207-14&P
3-4
Heater Data Codes Mode (Continued).
Note: The codes below will appear with a lower case “d” for A20 design
iteration version 3 and above (see Section 5 for details on design iteration
versions).
D1
- OPERATION HOURS
Display code
D1
will be followed successively by a pair of two digit numbers (4
numbers in total) indicating the total number of hours that the heater has
operated.
For example
D1
followed by
12
followed by
34
means - the heater has
operated 1,234 hours.
D2
- NUMBER OF STARTS
Display code
D2
will be followed successively by a pair of two digit numbers (4
numbers in total) indicating the total number of starts that the heater has
experienced.
For example
D2
followed by
22
followed by
17
means - the heater
has been started 2,217 times.
D3
- VERSION LEVEL
Display code
D3
will be followed by a two digit number that is the version number
of the Heater Software.
For example
D3
followed by
02
means - the Heater
Software is production version 2.
One minute after switching the heater off, the diagnostic system will display hours, starts, and
version level of the heater.
See Data Codes Mode Example, Table 3-5, which illustrates the
display code sequence for the examples presented above (D1, D2, and D3). The shaded
segments in Table 3-5 represent the time when the display is blank for one (1) second.
The
‘real world’ numeric values associated with the respective Data Codes in the display will likely
vary from those shown in the Example below.
D1
12
34
D2
22
17
D3
02
Table 3.7-2.
Data Codes Mode Example
3.8
Warning & Shutdown Faults
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
diagnostic codes and instructions in Section 6 (TROUBLESHOOTING) of this manual.
If a Fuel Pressure Sensor or Low Fuel Pressure Warning Fault, or any of the Shut Down faults
is encountered during Start Up or ignition is not achieved in the allowable 3 ½ minutes, the
heater will enter Purge mode, flash the Control Box Lamp, and display the component fault.
If a Warning Fault is encountered during Run operations, 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 Warning 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
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