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 198 of 288

TM 9-2540-207-14&P

6-34

6.5.43 F6 - INLET OVERHEAT (All Design Iterations)

A WARNING FAULT CODE WILL FLASH WHEN AMBIENT TEMPERATURE EXCEEDS 104°F

(40°C) AND THE HEATER WILL OPERATE ONLY ON LOW HEAT MODE

.IF THE AMBIENT

TEMPERATURE EXCEEDS A SAFE OPERATING TEMPERATURE OF 115°F (46°C) THEN

THE HEATER WILL DISPLAY THIS FAULT AND SHUTDOWN.

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

IS HEATER PRODUCING HEAT AND

OPERATING FAULT CODE

FLASHING?

NONE.

THIS IS NORMAL OPERATION.

HEATER HAS SWITCHED TO LOW MODE TO

ALLOW AMBIENT TEMPERATURE TO DROP

BELOW 104°F (40°C).

OPERATE HEATER IN LOW MODE

2

CHECK TO ENSURE THAT HEATER

DUCTING IS PROPERLY INSTALLED

VEHICLE TM

2.2

2.3

2.7

INSTALL DUCTING CORRECTLY TO HEATER.

ENSURE VENTILATION AIR BLOWS AWAY

FROM HEATER TO ENSURE PROPER AIR

MIXING.

3

IS HEATER IN PURGE MODE AND

ERROR CODE DISPLAYED?

3.5

NONE.

AMBIENT TEMPERATURE IS ABOVE

131°F (55°C) AND HAS TURNED ITSELF OFF.

PURGE HEATER AT LEAST 3 TIMES.

RESTART HEATER WHEN INSIDE VEHICLE

AMBIENT TEMPERATURE HAS COOLED

DOWN.

4

REVERSE AIR FLOW CONDITIONS

VEHICLE TM

2.2

2.3

2.7

INSTALL DUCTING CORRECTLY.

RESTART HEATER