TM 9-2350-230-12
Malfunction
Probable cause
Corrective action
WINTERIZATION COOLANT -
HEATER
60. Heater will not start
a. Improper starting procedure.
starting procedure.
b. Check lead #561 and circuit
b. No electrical power
1).
Repair or replace defective
components.
c. Remove obstruction.
d. Insufficient fuel flow
d.
(1)
Clogged filter(s) in line or
(1) Clean or replace filter(s)
pump
(2)
No electrical power to fuel
(2) With switch in START
pump
position, check voltage at
fuel pump. If no power,
check control box start
switch and circuit #563A
switch if defective. Repair
or replace harness as
necessary (fig. 12-9, 10).
(3)
Defective fuel pump
(3) If pump has power but will
not run, replace pump.
(4)
Defective fuel shutoff
8-14.1). Replace if
defective.
(5)
Overheat switch defective
Replace if defective
e. Flame detector switch out of
adjustment or defective
Adjust or replace as neces-
sary.
resistor
igniter if defective. If
resistor is defective replace
heater.
g. Blower motor inoperative
g.
(1)
No electrical power to
(1) Check lead #562 and blower
motor
8-14.1). Repair or replace
harness as necessary. If
resistor is defective re-
place heater.
(2)
Defective motor
(2) If motor has power but will
not run, replace heater.
h. If causes "a" through "g" have,
h. Other causes
been eliminated and heater
still does not start, replace
heater.
8-28