TM 5-4520-241-14
Table 3-2. Operator/Crew Troubleshooting - Continued
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
Step 4.
Check RESET switch.
Press RESET switch to reset beater circuit. Start heater in normal manner.
2.
HEATER FAILS TO START (NO HEAT; COMBUSTION MOTOR RUNS FOR A SHORT TIME, THEN STOPS).
Step 1.
Check that fuel tank contains fuel.
Replenish fuel supply.
Step 2.
Check that fuel supply has recently been replenished and that it contains no visible contaminants.
Replace fuel in lines and tank if it has become old or contaminated.
3.
HEATER OVERHEATS (OVERHEAT THERMOSTAT CUTS OFF FUEL FLOW)
Check for airflow restrictions.
Clear area of obstructions to permit free passage of air into and out of heater.
4.
HEATER BACKFIRES
Check for correct fuel. If the fuel has a high volatility, heat from the heat exchanger can create bubbles of fuel
vapor in the carburetor. Typically, this is a problem with certain gasolines.
Change type of fuel used, if possible.
3-4