2-16
TM 3-4230-209-30&P
TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WATER HEATER (CONT)
4. FUEL PUMP AND IGNITION DRIVE MOTOR WILL NOT START WITH HEATER CONTROL SWITCH IN HEATER ON POSITION (CONT).
Step 6. Check wire No. 4 for continuity using the following procedures:
a. Disconnect wire No. 4 from relay K2-A1, and disconnect other end of wire at combustor air pressure switch S3.
b. Use multimeter to check for continuity between ends of wire No. 4 while it is being flexed along its entire length.
Reinstall wire No. 4 back onto combustor air pressure switch S3 and onto relay K2-A1, if continuity is indicated.
Replace wire No. 4 between combustor air pressure switch S3 and relay K2-A1 if anything other than continuity is indicated.