TM 3-4230-209-20&P
2-24
TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WATER HEATER (CONT)
WATER HEATER DOES NOT HEAT WATER (CONT).
Step 4. Combustor air pressure switch (1) not operating.
Check exhaust area (2) for sound of combustor air blower motor (3) running (also
indicated by a slight breeze). If not running, check as follows:
(1) Check that pump unit HEATER RECEPTACLE AND SWITCH is ON (4). Turn
SWITCH to ON if necessary.
(2) Disconnect wire (5) to combustor air blower motor (3) and check for 24 vdc
between female side to ground. If voltage is indicated, notify intermediate direct
support maintenance to replace combustor air blower motor.
