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 173 of 288
TM 9-2540-207-14&P
6-9
2
CHECK SHORTS AND CONTINUITY OF
BURNER CABLE ASSEMBLY
CHECK 8 WIRES FROM PLUG J4 TO PLUG P1 FOR
CONTINUITY
J4-PIN1 TO P1-PIN6
J4-PIN2 TO P1-PIN8
J4-PIN3 TO P1-PIN7
J4-PIN4 TO P1-PIN1
J4-PIN5 TO P1-PIN2
J4-PIN6 TO P1-PIN3
J4-PIN7 TO P1-PIN4
J4-PIN8 TO P1-PIN5
ALSO CHECK FOR SHORTS BETWEEN WIRES IF ANY
CHECK FAILS REPLACE BURNER CABLE ASSEMBLY
RESTART HEATER
3
CHECK IMPELLOR FOR OBSTRUCTION
OR DAMAGE
REMOVE OBSTRUCTION IF DAMAGED REPLACE
IMPELLOR RESTART HEATER
4
CHECK BURNER FAN MOTOR SHAFT
FOR FREE ROTATION
IF MOTOR DOESN’T ROTATE FREELY REPLACE
BURNER FAN MOTOR RESTART HEATER
3
DEFECTIVE POWER BOARD
REPLACE POWER BOARD
RESTART HEATER
4
DEFECTIVE LOGIC BOARD
REPLACE LOGIC BOARD
RESTART HEATER
6.5.9
C5 - BURNER SENSOR FAULT (Design Iteration 1 & 2 Only)
BURNER SENSOR SIGNAL IS OUTSIDE NORMAL LIMITS
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
DEFECTIVE WIRING HARNESS
5.5.6
REPLACE WIRING HARNESS
RESTART HEATER
2
DEFECTIVE ELECTRONIC PROGRAMMED
CONTROLLER BOARD
5.2.5
REPLACE PROGRAMMED CONTROLLER BOARD
RESTART HEATER
6.5.10 C5 - BURNER SENSOR FAULT (Design Iteration 3 Only)
BURNER TEMPERATURE OR EXHAUST TEMPERATURE SENSOR SIGNAL IS OUTSIDE NORMAL LIMITS; BT
SENSOR SHORT OR
C5- XT SENSOR SHORT OR C5 - BT SENSOR OPEN OR
C5- XT SENSOR OPEN
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
CHECK BOTH CHASSIS AND VENT FAN
BOARD GROUND WIRES FOR PROPER
CONNECTION
RETIGHTEN CONNECTIONS
RESTART HEATER
2
CHECK FOR DAMAGED WIRES FROM
THERMOCOUPLE TO THE P11 WIRE
HARNESS PLUG
IF WIRES ARE DAMAGED
REPLACE WIRE HARNESS
RESTART HEATER
3
CHECK FOR LOOSE CONNECTIONS
BETWEEN THE VENT FAN BOARD AND
THE LOGIC BOARD
RECONNECT THE P11 PLUG INTO THE VENT FAN
BOARD AND THE P1 PLUG INTO THE LOGIC BOARD
RESTART HEATER
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