TM 5-3810-307-24-1-1
Direct/General Support Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
5. Fan fails to go to high
c. Malfunctioning HI-LO control
c. Check HI-LO control and
speed during burner
and microswitch.
microswitch adjustment.
cycle (continued).
6. Heater remains on burner
a. HI-LO control or micro-
a. Check HI-LO control and
cycle after heat demands
switch out of adjustment.
microswitch adjustment.
are met.
b. Bi-metal blade broken or
b. Replace bi-metal blade and/or
linkage out of adjustment.
adjust linkage as necessary.
c. Dirt on fuel solenoid valve
c. Clean fuel solenoid valve lip.
lip.
7. Excessive smoke in
a. Low voltage.
a. Check for low voltage, refer to
Symptom 4.
b. Excessive fuel flow.
b. Check for malfunctioning motor,
refer to Symptom 5.
c. Mechanical binding in
c. Check for binding and correct
combustion air blower motor.
as necessary.
d. Incorrect spark.
d. Check for spark, refer to
Symptom 2.
e. Malfunctioning igniter.
e. Check igniter, refer to Symptom
2.
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