TM 9-4120-402-14
Table 4-3. UNIT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER DOES NOT START IN ANY MODE.
CAUTION
Use disconnect switch (NOT POWER CABLE) to disconnect power to unit. Damage to
cable connector pins will result if cable is used.
If input power has been disconnected for an unknown period of time, do not start in
COOL MODE until power has been reconnected for a minimum of four hours.
Step 1. Check to see if input power has been disconnected.
Connect input power.
Step 2. Make sure that power is 208 volt, 3 phase, 50/60 or 400 hertz.
Connect correct input power.
Step 3. Check to see if circuit breaker is tripped.
Reset to ON position.
WARNING
Disconnect input power before performing internal electrical troubleshooting. Voltages used can
be lethal.
CAUTION
Use disconnect switch (NOT POWER CABLE) to disconnect power to unit.
Damage to cable connector pins will result if cable is used.
Step 4. Check for loose or damaged electrical connectors or damaged wires in wiring harnesses. (See
Tighten or replace connectors, or repair damaged wires.
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