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 172 of 288
TM 9-2540-207-14&P
6-8
5
DEFECTIVE VENT FAN MOTOR
5.2.6
REPLACE VENT FAN MOTOR RESTART HEATER
6
DEFECTIVE WIRING HARNESS
5.5.6
CHECK THREE WIRES;
P1-PIN 5 TO P11-PIN8;
P1-PIN11 TO P11-PIN 15;
P1-PIN14 TO P11-PIN 7
IF ANY FAIL THE CONTINUITY CHECK
REPLACE WIRING HARNESS RESTART HEATER
7
DEFECTIVE POWER BOARD
REPLACE POWER BOARD
RESTART HEATER
8
DEFECTIVE LOGIC BOARD
REPLACE LOGIC BOARD
RESTART HEATER
6.5.7
C4 - BURNER FAN FAULT (Design Iteration 1 & 2 Only)
BURNER FAN SPEED IS BELOW NORMAL LIMITS
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
WITH HEATER IN PURGE MODE, CHECK
AIRFLOW AT EXHAUST PORT, OR
SUCTION AT AIR INLET
.BE CAREFUL
NEAR THE EXHAUST SYSTEM.
EXHAUST GASES ARE HOT
.
I
F AIR IS
NOT
CIRCULATING THROUGH THE HEATER,
CHECK ALL ELECTRICAL CONNECTIONS FROM THE
BURNER FAN MOTOR TO THE BURNER FAN DRIVER.
ALSO CHECK ALL ELECTRICAL CONNECTIONS ON
BOTH WIRING HARNESSES
RESTART HEATER
2
DEFECTIVE BURNER FAN PLATE
5.5.4
REPLACE BURNER FAN PLATE
RESTART HEATER
3
DEFECTIVE WIRING HARNESS
5.5.6
REPLACE WIRING HARNESS
RESTART HEATER
4
DEFECTIVE ELECTRONIC
PROGRAMMED CONTROLLER
5.2.5
REPLACE ELECTRONIC PROGRAMMED CONTROLLER
RESTART HEATER
5
DEFECTIVE BURNER FAN MOTOR
5.6.6
REPLACE BURNER FAN MOTOR
RESTART HEATER
6
DEFECTIVE BURNER FAN DRIVER
BOARD
5.6.4
REPLACE BURNER FAN DRIVER BOARD
RESTART HEATER
6.5.8 C4 – BURNER FAN FAULT (Design Iteration 3 Only)
BURNER FAN SPEED IS BELOW NORMAL LIMITS; BURNER POWER DRIVER STATUS
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
CHECK BURNER FAN MOTOR
CONNECTIONS TO THE POWER BOARD
RECONNECT THE BURNER FAN MOTOR TO THE
POWER BOARD RESTART HEATER
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