Troubleshooting
3A1185B
19
Power Source
Using a Phillips Head screwdriver, remove the
four screws holding the pressure control
assembly. Locate the red light on the board
indicating there is power (it will be red).
If the light is ON, see Pressure Control
Assembly (Board).
If the light is OFF, locate the L1 and L2 termi-
nals on the board. Use the multi-meter to
ensure there is 110 volts AC across the two
terminals (the cord wires will still be attached.)
If there is no voltage at the leads, there is no
power getting to the machine. Check the
power source (outlet, circuit fuse, extension
cord, and power cord).
If you have AC voltage at the L1 and L2 termi-
nals, disconnect the two red motor leads (S1
and S2) and test for continuity between them.
No continuity means the thermal coupler has
opened due to excessive motor heat. If the
motor is still hot to the touch, allow it to cool
and then retest. If the motor is cool and there
is not continuity on the read leads, contact Air-
lessco Technical Support to repair/replace the
thermal coupler.
Continuity shows that the motor’s thermal cou-
pler has not tripped. See Pressure Control
Assembly (Board).
Pressure Control Assembly
(Board)
If the power indicating light is still out after
checking the control settings, fuse and power
source, replace the pressure control assem-
bly.
Motor
Remove the motor brush covers and turn the
machine ON. Set the potentiometer (POT) at
maximum pressure and check for DC voltage
across both brush terminals. It should read
greater than 80 volts DC.
If you have DC voltage, turn the machine off
and unplug it from the wall. Check to make
sure the brushes are making good contact
with the armature. Replace the brushes if they
are less than 1/2” long. If the brushes are
good, replace the motor.
If you do not have DC voltage, see
Sensor
.
Problem
Cause
Solution
