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 197 of 288

TM 9-2540-207-14&P

6-33

6.5.41 F5 - OVER CURRENT (Design Iteration 1 & 2 Only)

THE HEATER HAS DETECTED THAT THE CURRENT DRAWN FROM THE VEHICLE HAS

EXCEEDED THE NORMAL OPERATING LIMIT OF 20 AMPS

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

WITH HEATER OFF, CHECK FOR

FREE ROTATION OF THE VENT

IMPELLER BY SPINNING BY HAND

5.2.4

5.2.6

IF IMPELLER DOES NOT ROTATE FREELY,

REPLACE VENT FAN IMPELLER AND MOTOR

RESTART HEATER

2

DEFECTIVE POWER AND WIRING

HARNESSES

5.5.6

REPLACE BOTH LOGIC AND WIRING

HARNESSES

RESTART HEATER

3

DEFECTIVE ELECTRONIC

PROGRAMMED CONTROLLER

BOARD

5.2.5

REPLACE ELECTRONIC PROGRAMMED

CONTROLLER

RESTART HEATER

6.5.42 F5 - OVER CURRENT (Design Iteration 3 Only)

THE HEATER HAS DETECTED THAT THE CURRENT DRAWN FROM THE VEHICLE HAS

EXCEEDED THE NORMAL OPERATING LIMIT OF 20 AMPS

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

WITH HEATER OFF, CHECK FOR

FREE ROTATION OF THE VENT

IMPELLER BY SPINNING BY HAND

NOTE: IF ON TEST STAND, BE SURE

THAT POWER SUPPLY/ TEST

APPARATUS IS NOT CURRENT

LIMITING

5.2.4

5.2.6

IF IMPELLER DOES NOT ROTATE FREELY,

REPLACE VENT FAN IMPELLER AND MOTOR

RESTART HEATER

2

CHECK IGNITER RESISTANCE

MEASURE THE RESISTANCE OF THE IGNITER

IF LESS TRHAN 1.6 TO 1.8 OHMS

REPLACE IGNITER

RESTART HEATER

3

DEFECTIVE WIRING HARNESSES

REPLACE WIRING HARNESSES

RESTART HEATER

4

DEFECTIVE VENT FAN BOARD

REPLACE VENT FAN BOARD

RESTART HEATER

5

DEFECTIVE POWER BOARD

REPLACE POWER BOARD

RESTART HEATER

6

DEFECTIVE LOGIC BOARD

REPLACE LOGIC BOARD

RESTART HEATER