9.
Portable Unit Troubleshooting
Problem
Reason
Check
Tips
The power is not switched
on
Check if the power supply
is connected correctly
Connect the
power supply
correctly
1
The power
switch cannot
be turned on
A fuse is blown
Check the patch board
and the electric
connection of the
compressor
Replace the
wire according
to circuit
diagram
The wire to the power
supply has fallen off or an
electric component is loose
Check the patch board
and the electric
connection of the
compressor
Connect the
wire according
to circuit
diagram
The temperature of air
compressor is too high
Touch the shell of the air
compressor by hand
Cool the air
compressor,
use it until it is
cooling
2
Compressor
cannot be
stared
The forward valve fails to
work
Take off the tube which
connects the inlet of the
valve, check if there is a
air leakage
Clean the valve
The unloading valve on the
pressure switch fails to
function
The unloading valve is
exhausting when the air
Remove the
unloading
valve, exchange
O-‐ring, clean
tubing
Leakage in the tube
Watch and listen for air
leak or check leak with
soap suds
Avoid leaking
air
3
The air
compressor
keeps working
and cannot be
stopped
Air leakage in automatic
drainage of filter valve
Check if there is air
leakage in automatic
drainage of filter valve
Avoid leaking
air
