TM 5-4520-253-13
Table 3-3. Unit Maintenance Troubleshooting – Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check for tripped reset circuit
breaker.
Press RESET and CIRCUIT
BREAKER buttons.
Death or serious injury could occur if pre-
cautions are not taken when maintaining this
equipment. Be sure that any power cables
are unplugged/disconnected. Be sure that the
equipment is properly grounded. Always
have another person standing by who is
trained in electric shock first aid.
Step 3. Check power source of 120 V ac.
Restore 120 V ac power or repair power source,
Step 4. Check power cable.
Disconnect power cable from POWER RECEPTACLE
heater. Check for 120 V ac between pins A and C of plug.
To replace defective power cable, disconnect power cable from 120 V ac
source.
Replace power plug as described in REMOVE/lNSTALL POWER,
FUEL PUMP, AND ROOM THERMOSTAT PLUGS, page 3-124. Connect
new power cable to 120 V ac source.
Step 5. Check POWER RECEPTACLE. Disconnect power cable and check for continuity
through pins A, C, and D of receptacle.
Replace defective receptacle as described in lNSPECT/REMOVE/lNSTALL
POWER RECEPTACLE AND EXTERNAL FUEL PUMP RECEPTACLE,
page 3-60.
3-26
