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 165 of 288
TM 9-2540-207-14&P
6-1
6 TROUBLESHOOTING
This section explains the diagnostic system used by the A20 heater to aid in the determination
and repair of heater malfunctions, as well as guiding the user through a step by step procedure
to rectify problems based on the particular diagnostic code given.
Note:
In some installations the diagnostic display is not visible.
A remote
display is available as an accessory.
Contact manufacturer for details.
6.1
Diagnostic
Fault Codes
Note: Operating
Codes 00 to 07, 14 and 99, as well as Data Codes D1, D2,
and D3 are displayed as part of normal operation and do not require any
maintenance actions.
To assist heater maintenance, a diagnostic system has been developed to isolate the problem
area.
This section gives a brief explanation of the fault codes used by the A20 heater.
Three different types of Diagnostic Fault Codes are used: Component Failure Codes (”
C
”),
Operating Error Codes (“
E
”), and Operating Faults (“
F
”).
Note:
If the Diagnostic Display appears blank and the heater is operating,
the Diagnostic Display circuit has failed, see 5.8.2.
6.1.1
“C” Codes - Component Failures
Component Failure codes are designed to identify hardware faults.
C
1
Ignitor Fault
C2
Ignitor Short
C3
Vent Fan Fault
C4
Burner Fan Fault
C5
Burner/Exhaust Sensor Fault
C6
Vent Sensor Fault
C7
Fuel Pressure Sensor Fault
C8
Controller Fault
C9
Fuel Pump Fault
C
A
Fuel Injector Fault
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