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 TM 5-6640-214-14
(c) If the compressor will not run, make a test lamp check across the relay terminals. The test lamp should
light to show a live circuit if the thermostat is in the normal operating position, and not in the OFF position. If this check
does not show a live circuit, the thermostat and wiring should be checked for an open circuit. Pay particular attention to
all terminal connections.
(d) A thermostat check can be made using a piece of wire as a temporary bridge across the two thermostat
terminals. If the compressor starts and runs with the bridge, the thermostat is at fault and should be changed.
(e) If the test lamp check shows power supply at the relay terminals, check the compressor by means of a
manual test set.
c. Troubleshooting. The operator should be guided by the following chart (table 5-3) in diagnosing and correcting
operating difficulties.
5-8
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