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TM 5-4120-259-15
37. Evaporator Fan Motor Runs-Condenser Fan Motor and Compressor Motor will not Run
(Selector Switch on COOL)
Probable Cause
Possible Remedy
Circuit breaker open.
Determine and correct cause of overload.
High pressure cutout.
If the evaporator fan motor runs and the thermostat
is calling for cooling, but the condenser fan and
compressor motors do not run, the high pressure
cutout has probably opened and should be reset
at the dual preassure switch.
38. Fan Motor and Compressor Motor will not Run
Probable Cause
Blown fuse at power source.
Defective power outlets, broken wire or loose
terminal connection or faulty power switch.
39. Compressor Noisy
Probable Cause
Loose mounting bolts.
Internal noise in compressor.
Unit vibrating against nearby tubing or objects.
40. Compressor Will Not Run Steadily
Probable Cause
Stopping on high pressure cut-out.
41. Air Output Volume Insufficient
Probable Cause
Filters dirty.
Evaporator coils dirty.
Dirty fan blades.
Fan(s) running too slow.
42. Insufficient Cooling
Probable Cause
Insufficient refrigerant charge or faulty compressor
operation.
Filters dirty.
Improper adjustment of damper control.
43. Excessive Cooling
Probable Cause
Thermostat set too low.
defective thermostat.
Posible Remedy
Test for voltage at the power outlet. No voltage
indication usually means that the line fuses are
defective. If common fuses have been used, thay
should be replaced with 30 amp time lag fuses
such as Fustats or Fusetrons or 40 amp regular
fuse.
Check the power switch circuits (fig. 5) and make
necessary repairs.
Possible Remedy
Tighten all mounting belts.
Replace compressor if’ necessary (para 98).
Provide clearance for unit.
Possible Remedy
May be dirty condenser, faulty high pressure cut-out,
or excessive heat. Locate trouble and correct.
Possible Remedy
Clean filters (para 55).
Clean coils.
Clean fan blades.
Check motor. Replace if necessary (para 57 and 58).
Possible Remedy
Check refrigerant charge, Replace compressor if
defective (para 98).
Clean filters (para 55).
Adjust damper control.
Adjust as necessary (para 60).
Replace thermostat (para 60).
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