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 191 of 288

TM 9-2540-207-14&P

6-27

THE HEATER WAS UNABLE TO ESTABLISH IGNITION IN THE 3½ MINUTE TIME LIMIT

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

13

CHECK CONDITION OF FLAME

TUBE AND BURNER CHAMBER

5.3.2

5.3.5

REPLACE FLAME TUBE AND BURNER

CHAMBER

RESTART HEATER

14

WICK IS DEGRADED

5.3.6

REPLACE BURNER CARTRIDGE

15

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

16

CHECK WIRE HARNESS FOR

CONTINUITY AND SHORTS

CHECK 2 WIRES FROM THE VENT FAN BOARD

TO THE LOGIC BOARD FOR CONTINUITY AND

SHORT TO GROUND:

P11-PIN12 TO P1-PIN3

P11-PIN4 TO P1-PIN12

CHECK

FOR MV SIGNAL

BETWEEN

P11-PIN13 AND P11-PIN5 FOR BT SENSOR

P11-PIN14 AND P11-PI N 6 FOR XT SENSOR

CHECK FOR OPEN LINE BETWEEN

P11-PIN13 TO CHASIS GROUND AND

P11-PIN14 TO CHASIS GROUND

IF ANY CHECK FAILS

REPLACE WIRE HARNESS

RESTART HEATER