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Page Title:
Table 1. Unit Troubleshooting Procedures - Continued |
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 TM 9-4120-425-14&P
UNIT TROUBLESHOOTING - Continued
0014-00
Table 1. Unit Troubleshooting Procedures - Continued
MALFUNCTION
TEST OR INSPECT
CORRECTIVE ACTION
WARNING
Disconnect the power source.
1.
Make sure that circuit breaker or
Reset controls properly.
4.
COMPRESSOR WILL NOT
selector switch is properly set.
START
2.
Check for open contacts of high-
1.
Reset high pressure switch.
or-low-pressure cut-out switches.
(Refer to WP 0072-00.)
2.
Report fault to Direct Support
Maintenance personnel if
condition continues.
3.
Check for loose electrical
1.
Tighten loose connections.
connections.
2.
If wiring replacement is
necessary notify direct support.
Repair open circuit or replace wire.
4.
Make continuity check of control
(Refer to WP 0034-00.)
circuit to determine whether open
circuit exists. (Refer to WP 0034-
5.
Check continuity across primary
Replace bad transformer. (Refer to
winding and across secondary
winding of control transformer to
see whether windings are good.
(Refer to WP 0035-00.)
6.
Observe operation of time delay
Replace bad time delay device. (Refer
device and check continuity.
to WP 0035-00.)
(Refer to WP 0035-00.)
7.
Check that the Mode Selector
1.
Switch to COOL position.
switch is in the COOL position.
2.
Replace bad Mode Selector
switch. (Refer to WP 0034-00.)
5.
INSUFFICIENT HEATING
1.
Check that Mode Selector switch
1.
Switch to HEAT position.
is in HEAT position.
2.
Replace bad Mode Selector
switch. (Refer to WP 0034-00.)
0014-00-5
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