TM 5-4520-241-14
WARNING
This space heater contains dangerous voltages which can cause severe electrical
shock. Be extremely careful when making voltage measurements or other checks
with the heater connected to the power source during troubleshooting. Always
remove the power plug before making any continuity tests.
NOTE
Before you use this table, be sure you have performed all applicable operating
checks. This table assumes that all applicable operator/crew and organizational
maintenance troubleshooting performed, but the cause of the malfunction has not
been located.
Table 5-1. Direct Support and General Support Troubleshooting
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
1.
HEATER FAILS TO IGNITE AND RED INDICATOR LIGHT COMES ON.
Step 1.
Check for combustion air. If the combustion motor seems to run, disconnect the air duct by
loosening the clamp at the burner and disconnecting the duct. Move the HEATER-OFF-FAN switch
to HEATER. There must be a distinct flow of air.
If there is air flow, proceed to step 2. If there is no air flow, proceed to step 4.
Step 2.
Check adjustment of the time delay assembly. Disconnect the power plug. Open the access
doors. Open the control box cover. Disconnect the yellow lead from the output of the fuel pump
power supply transformer so that no power is applied to the carburetor solenoid valve or to the
external fuel pump. Disconnect the brown lead at terminal strip terminal G to disconnect the
ignition transformer.
5-2
