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Section V. TROUBLESHOOTING
4-11. General
This section contains troubleshooting instructions
for the isolation of causes of common troubles that
may occur during operation and also contains the
possible remedies to correct the trouble.
4-12. Organizational Troubleshooting Chart
a. General. Troubleshooting procedures for
organizational maintenance personnel are listed in
table 4-2. The first column shows the apparent
trouble or malfunction. The second column con-
tains the probable cause. The third column lists the
corrective action to be taken. Remedies that are
beyond the scope of organizational maintenance
must be reported to direct support maintenance
personnel. Additional procedures are listed in
paragraphs b and c below.
6. Control Circuit. The cause for a system’s
failure to operate can be greatly narrowed if the
control which caused the failure can be isolated. It
Table 4-2. Troubleshooting
is the function of safety devices to open the circuit
under certain conditions;
therefore.
additional
checking may be required to determine whether the
safety device is open because it is defective or is
performing its designed function. The following
steps contain instructions for checking the control
circuit,
(1) Disconnect power from air conditioner.
(2) Test the continuity across each control in
the affected circuit with a test lamp or ohmmeter if
available, using schematic diagram as a guide.
Check wiring diagrams for connections.
(3) Replace defective parts.
c. Safety Devices.
When testing the control
circuit and other equipment.
t a k e i n t o c o n-
sideration the fact that open safety devices may not
be defective. It may be normal for the device to be
open under the existing conditions or it may in-
dicate trouble elsewhere in the air conditioner.
4-3
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