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 188 of 288

TM 9-2540-207-14&P

6-24

6.5.32 E6 - HIGH VOLTAGE (Design Iteration 3 Only)

VOLTAGE SUPPLIED TO THE HEATER IS ABOVE NORMAL VOLTAGE LIMITS (19VDC - 30VDC

NORMAL RANGE)

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

CHECK THE SOURCE VOLTAGE OR

BATTERY LEVELS.

VEHICLE TM

IF VOLTAGE IS GREATER THAN 30VDC THEN

CHECK VEHICLE ALTERNATOR - SEE

APPROPRIATE VEHICLE TM

TURN HEATER OFF UNTIL VOLTAGE SYSTEM

REPAIRED

2

CHECK VOLTAGE AT THE POWER

BOARD TO LOGIC BOARD

INTERFACE

VOLTAGE BETWEEN GROUND (J9-PIN1) AND

HOT WIRE (J2-PIN6) SHOULD EQUAL THE

VOLTAGE SUPPLIED

IF THE VOLTAGE IS HIGH

REPLACE THE POWER BOARD

RESTART HEATER

3

DEFECTIVE LOGIC BOARD

5.2.5

REPLACE LOGIC BOARD

RESTART HEATER

NOTE: IF VOLTAGE IS 29.5 – 31 VDC HEATER WILL FLASH AN E6 WARNING AND CONTINUE TO

OPERATE.

AT VOLTAGES GREATER THAN 31 VDC MEASURED AT THE HEATER, THE HEATER WILL

SHUT DOWN WITH AN E6 HARD FAULT.