TM 5-3810-307-24-1-1
Direct/General Support Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
2. Heater fails to start -
a. No spark (continued).
a. Check for spark by holding an
motor runs (continued).
insulated handle screwdriver
with the shaft grounded and the
tip approximately 0.125 in. (3.18
mm) away from the high tension
lug of the igniter pack. There
should be a continuous strong
spark. If no spark is produced,
check that there is voltage
applied to the ignition power
supply. If input voltage is
present and no spark or weak
spark is produced, replace
ignition pack.
b. Malfunctioning igniter.
b. To check igniter, remove and
examine. The electrode should
be centered and not clogged or
shorted with carbon. Visually
check operation with igniter
removed from burner head, but
connected to high tension lead
with body grounded. Shut off
fuel and ground igniter on the
heater case to check for spark.
Replace if defective.
3. Motor runs but there is no
a. Inadequate fuel at
a. Check for fuel at float bowl.
ignition.
carburetor.
Remove pipe plug at side of
float bowl and gently depress
the float. If fuel is present, it will
show on the object used to
depress float and buoyancy will
be felt.
b. Malfunctioning HI-LO control
b. Check HI-LO control and
and microswitch.
microswitch adjustment.
c. No spark.
c. Check for spark as described in
Symptom 2.
d. Malfunctioning igniter.
d. Check for spark as described in
Symptom 2.
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