2-26
TM 3-4230-209-20&P
TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WATER HEATER (CONT)
WATER HEATER DOES NOT HEAT WATER (CONT).
Step 5. Fuel pump and ignition drive motor does not run in PURGE ON.
a. Disconnect electrical connector (1) from motor (2) and check for 24 vdc between female end and ground. If
voltage is indicated, replace fuel pump and ignition drive motor.
b. Check for 24 vdc between terminal K1-X1
and ground and terminal K1-A1 and ground.
If 24 vdc is indicated at X1 but not at A1,
shut electrical power off at pump unit, and
disconnect lead from X1. Check for resis-
tance from X1 to X2 of relay coil. If continu-
ity or infinity is indicated, replace K1 relay.
Must read a few ohms for coil resistance.
