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TM 9-2320-364-20-2
2-1590
49. HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS (CONT).
Cooling fan operation normal
indicating 24 vdc supplied to
EPAC from CB15.
Fan and heater operates at one
speed.
FAN control switch OK.
Heater wire harness OK.
Heater resistor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Resistor is faulty if resistance is
not within specified range.
YES
NO
Replace resistor
(Para 19-13).
Verify repair, go to
Step 10 of this Fault.
4.
Is resistance of heater
resistor within range
specified?
Fault not corrected.
Notify DS
Maintenance.
3.
Repair wires or
replace wire harness
(Para 19-17).
Verify repair, go to
Step 10 of this Fault.
YES
NO
Cooling fan operation normal
indicating 24 vdc supplied to
EPAC from CB15.
Fan and heater operates at one
speed.
FAN control switch OK.
Heater wire harness faulty.
Heater resistor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If continuity is not measured,
heater wire harness is faulty.
WARNING
WARNING
Is there continuity measured
between harness ends of red
and brown wires?
Resistance test.
STE/ICE-R #91.
Read WARNING
on Page 2-1591
Read WARNING
on Page 2-1591
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