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TM 9-2320-364-20-2
2-1596
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 OK.
Wire 1082 OK.
Rectifier M81 OK.
Wire 1082 OK.
Orange wire OK.
Heater motor ground faulty.
Heater motor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If heater motor is not grounded,
heater will not operate.
YES
NO
Repair or replace
motor ground wire
(Para 19-13).
Verify repair, go to
Step 10 of this Fault.
9.
Is continuity measured
between casing of heater
motor and known good
ground?
Replace heater motor
(Para 19-13).
Verify repair, go to
Step 10 of this Fault.
8.
Repair or replace
orange wire (see
schematic Fig 2-42).
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 OK.
Heater resistor OK.
Wire 1082 OK.
Rectifier M81 OK.
Wire 1082 OK.
Orange wire faulty.
Heater ground faulty.
Heater motor faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not
measured, wire harness is
faulty.
WARNING
WARNING
Is 22 to 28 vdc measured on
orange wire at splice of heater
motor harness?
Read WARNING
on Page 2-1597
Read WARNING
on Page 2-1597
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