TM 5-4520-256-14
CHAPTER 4
INTERMEDIATE DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
Section I.
Troubleshooting
Section II.
Maintenance Instructions
Section I. TROUBLESHOOTING
Para.
Para.
Introductory Information ...................... 4-1
Troubleshooting........................................... 4-3
Symptom Index................................... 4-2
4-1. INTRODUCTORY INFORMATION.
a. The table lists the common malfunctions which you may find during the maintenance of the heater unit or its
components. You should perform the tests/inspections and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunctions not listed or is not corrected by the listed corrective actions, notify your supervisor.
4-2. SYMPTOM INDEX.
Malfunction
No.
Malfunction
Page
1
Centrifugal fan fails to start ................................................................................. 4-1
2
Fuel pressure fails to rise (Heat Mode) ................................................................ 4-2
4
High fuel pressure ............................................................................................... 4-2
3
Low fuel pressure ................................................................................................ 4-2
4-3. TROUBLESHOOTING. (Refer to Table 4-1).
Table 4-1. Intermediate Direct Support Level Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. CENTRIFUGAL FAN FAILS TO OPERATE.
If this condition exists, replace the motor (para 4-6).
4-1
