TROUBLE SHOOTING GUIDE FOR UNITS WITH DX COOLING
7
Complaint
Symptoms
Probable Cause
Recommended Action
Ref.
Note
a. Power failure.
a. Check for blown fuse or broken
lead.
1. Electric circuit test
shows no voltage on
line side of motor
starter
b. Disconnect
switch open.
b. Determine why switch was
opened. If everything is
satisfactory, close switch.
2. Electric circuit test
shows voltage on line
side but not on motor
side of fuse.
Fuse blown.
Replace fuse. Check load on
motor.
3. Electric circuit
tester glows but not at
full brilliance.
Low voltage.
Check with voltmeter. If low, call
power company.
4. Full voltage at
motor terminals but
motor will not run.
Burned out motor.
Repair or replace.
5. Inoperative motor
starter.
Burned out holding
coil or broken
contacts.
Repair or replace.
6. Compressor will not
operate.
Frozen compressor
due to locked or
damaged
mechanism.
Overhaul compressor.
7. Resetting high-
pressure switch can
restart system.
See complaint G.
See complaint G.
8. Resetting oil failure
protection control
switch can restart
compressor.
Compressor runs for a
short time and again
stops.
Oil failure
protection control
switch has cut out.
Check oil level, oil pressure,
wiring and control.
a. Overload
contacts open.
a. Determine cause of failure.
Reset overload contacts.
A. Compressor fails to start
9. Starter will not pull
in.
b. Open control
circuit.
b. Locate open control, determine
cause.
