01671H (DCN6051) 7-1
7 TROUBLESHOOTING This section presents possible problems and their causes and solutions.
Problem Probable Cause Corrective Action
Unplugged power cord. Plug in power cord at both
ends.
Incorrect line voltage. Refer to Table 3-1 for the
correct line voltage.
Tripped power switch/circuit
breaker.
Untrip power switch/circuit
breaker.
Power light does not come
on.
VDC power supply failed. Replace power supply.
Tank pressure is above the
cut-out pressure.
No action. Pressure will
drop as air is used.
AIR IN filter is plugged. Replace the filter.
Compressor fan is jammed. Check for any mechanical
obstruction.
Pump is not connected to
controller.
Connect the pump to the
controller.
Pressure switch is not
connected.
Connect the pressure
switch.
Compressor does not start
(after 10 seconds).
Pump relay (K4) is open. Replace the controller.
Compressor stops and
does not restart.
Pressure in the tank has not
subsided to the pressure
switch cut-in setting.
No action. Wait for the
pressure to subside.
Internal leak. Check for leaks. Refer to
Section 6.11.
Compressor does not stop
when the demand is low
(less than 5 LPM). Pump has low output
pressure.
Rebuild pump.
Shipping screws have not
been completely removed.
Ensure the screws are
completely removed.
Instrument vibrates
excessively. Compressor shock isolator
screws are loose.
Tighten the screws.