TM 5-4520-241-14
Table 4-2. Organizational Maintenance Troubleshooting
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
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
disconnect the power cable plug before making any continuity test.
1.
BOTH INDICATOR LIGHTS FAIL TO LIGHT WHEN HEATER-OFF-FAN SWITCH IS TURNED TO HEATER.
Step 1.
Check for tripped circuit breaker.
Press circuit breaker reset button.
Step 2.
Check power source for 120 VAC.
Restore circuit or repair power source.
Step 3.
Check for power to heater. Remove control box and disconnect male plug. Check for 120 VAC
with voltmeter at sockets 1 and 7 on exposed 9-socket receptacle.
Check power cable and power receptacle as indicated below.
Step 4.
Disconnect power cable from source and heater. Use test light or ohmmeter to check for continuity
from end to end.
Disassemble plug and tighten connections. Replace or repair cable if tightening connections fails
to correct the defect.
Step 5.
Check for defective power receptacle (filter and receptacle assembly). With power cable
disconnected from heater, use test light or ohmmeter to check continuity from receptacle pins to
solder terminals on back of receptacle filter.
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