13-8-619 Page 40
SECTION 9
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE REMEDY
Compressor fails to start
1. Wrong lead connections. 1. Change leads.
2. Blown fuses in control
box.
2. Replace fuse
3. Motor starter overload
heaters tripped
3. Reset and investigate
cause of overload.
4 Pressure in reservoir. 4 Inspect blowdown valve.
Compressor starts but
stops after a short time
1. High discharge
temperature.
1. See “High Discharge Air
Temperature,” this
section.
2. High separator/ high
compressor temperature
light on.
2. See “High Discharge Air
Temperature”, this
section.
3. Blown fuse in starter/
control box.
3. Replace fuse (investigate
if fuses continue to blow).
4. Motor starter overload
heaters trip.
4. Reset and investigate
cause of overload.
Compressor does not
unload (or load)
1. Improperly adjusted
control.
1. Refer to SECTION 4,
page 17 and adjust
control.
2. Air leak in control lines. 2. Determine source of leak
and correct.
3. Restricted control line. 3. Clean control lines.
Compressor cycles from
load to unload
excessively
1. Insufficient receiver
capacity.
1. Increase receiver size.
2. Restriction in service
piping.
2. Inspect and clean service
piping.
3. Restriction in control
tubing.
3. Inspect and clean control
tubing.
4. Plugged aftercooler. 4. Inspect and clean
aftercooler.
Compressor is low on
delivery and pressure.
1. Restricted air filter. 1. Clean or replace filter.
2. Sticking inlet valve. 2. Inspect and clean inlet
valve.
3. Minimum pressure valve
stuck closed.
3. Replace valve.
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