TM 9-2320-266-34
Table 24-2. Personnel Heater Troubleshooting-Continued
Remedy
Type of Trouble
Reason
OVERHEATS AND STOPS
OPERATING
Overheats
a. Redistricted or defective exhaust
Remove restriction; clean heater com-
bustion chamber.
Replace control valve.
b.
Fuel control valve
c.
Flame detector switch
Replace flame detector switch.
d.
Overheat switch
Replace switch assembly.
Stops burning
a.
Insufficient air
Check air intake and remove any
restrictions.
BLOWER OPERATES BUT NO
a. Defective igniter
Test in accordance with paragraph
IGNITION
b. Defective ignition control
Test in accordance with paragraph
c. Clogged orifice
Clean or replace orifice.
d. Clogged fuel line
Clean fuel lines.
e. Clogged fuel filter
Clean or replace.
f. Defective fuel pump
Replace.
g. Low voltage
Test in accordance with paragraph
BLOWER DOES NOT OPERATE
a. No current
Check electrical connections.
b. Defective motor
Replace motor.
24-5. Cab Heavy-duty Heater Troubleshooting.
The cab heater/defroster is identical to the standard
heater except for a heavy-duty motor and core. Table 24-3
presents troubleshooting data for the complete heater/
defroster.
Table 24-3. Cab Heavy-duty Heater
Remedy
Reason
Type of Trouble
Add coolant to cooling system.
a. Insufficient coolant in cooling
INSUFFICIENT HEAT
system
Replace hose.
b. Collapsed coolant outlet hose or
plugged inlet hose
Added coolant to cooling system.
c. Air in heating system
Connect hose to proper position.
d. Hose connections crossed
Check and replace fuse if necessary.
e. Blower motor inoperative
Inspect wiring and connection.
Replace or tighten if required.
See engine diagnosis in chapter 2,
f. Low engine temperature
Replace water valve or adjust control
a. Water valve inoperative or
TOO MUCH HEAT
cable as necessary.
improperly adjusted
Replace or connect boden cable as
b. Disconnected or broken boden
necessary.
cable
Replace thermostat.
c. Engine thermostat
Replace fuse.
a. Blown fuse
BLOWER MOTOR NOT
Tighten connections.
b. Faulty electrical connection
OPERATING
Replace blower switch.
c. Faulty blower switch
Replace blower motor.
d. Faulty blower motor
Replace resistor.
e. Faulty resistor
Change 5
24-5
