TM 9-4520-260-13
Table 5-1. Troubleshooting
HEATER FAILS TO START-
NO FLAME, NO BLOWER
NO POWER AVAILABLE TO THE GLOW PLUG
JUMPER TERMINALS 1 TO 4 ON ECU1. IF GLOW PLUG HEATS, REPLACE ECU1. IF STILL
NO POWER TO GLOW PLUG, CHECK ELECTRICAL CIRCUIT BETWEEN J1 AND TERMINAL
1 OF ECU1.
NO POWER TO THE IGNITION PACK
JUMPER TERMINALS 1 TO 10 ON ECU1. IF KNOWN GOOD IGNITION PACK AND IGNITER
SPARK, REPLACE ECU1. IF NO SPARK, CHECK ELECTRICAL CIRCUIT BETWEEN J1 AND
TERMINAL 1 OF ECU1.
IGNITION PACK IS OPERABLE AND MOTOR BRUSHES ARE NOT WORN,
BUT HEATER FAILS TO START - NO FLAME, NO BLOWER
JUMPER TERMINALS 1 TO 5 ON ECU1. IF FAN DOES NOT OPERATE, REPLACE MOTOR. IF
FAN OPERATES, REMOVE GREY WIRE FROM TERMINAL 5 OF ECU1 AND CONNECT IT TO
TERMINAL 10 OF ECU1. TURN POWER SWITCH S-1 AND ROOM THERMOSTAT TO ON;
CHECK FOR HEATER OPERATION. IF HEATER STARTS AND RUNS, CHECK FOR POWER AT
TERMINAL 5 ON ECU1 WHILE HEATER IS OPERATING. IF NO POWER, REPLACE ECU1.
5-2
