TM 9-2350-230-12
Malfunction
Probable cause
Corrective action
WINTERIZATION COOLANT -
HEATER - Continued
61. Heater starts but indi-
a. Lamp burned out
a. Press to test. Replace If
cator light does not
burned out.
come on.
b. Open circuit
b. Check circuits #564 and #565
replace harness as neces-
c. Flame detector switch out of
c. Hold switch In START positioi
adjustment or defective
and operate heater for 3 or
4 minutes. Check voltage
no power, adjust or re-
place flame detector
62.Heater overheats and
a. Insufficient coolant flow,
a.
shuts off
(1)
No power to coolant
(1)
Check circuit #585 (table
circulating pump
8-14.1). Repair or re-
place harness as necessary
(2)
Coolant pump defective
(2)
If pump has power but will
not run, replace pump.
(3)
Kinked hose
(3)
Straighten hose.
(4)
System air-locked
(4)
Bleed air from system
(5)
Improper coolant mixture
(5) Drain and fill system with
(frozen or slushy)
b. Excessive fuel flow
b. (Usually accompanied by
excessive smoke). Replace
heater.
63.Heater overheats but
Same causes as 62 above,
Refer to 62 above. Correct
does not shut off
plus a defective overheat
cause of overheating and
switch
replace overheat switch,
or replace heater.
64. Heater starts and runs
a. Clogged filter in line or pump,
a. Clean or replace filter(s)
but stops after a short
interval (Control box
switch on RUN)
b. Overheat switch out of
b. Replace switch (fig.
c. Excessive carbon in burner
c. Replace heater.
d. Defective fuel valve
d. Replace heater.
8-28.1