Storch Airless ST 450 Mode D'emploi page 147

Fault
Sprayer does not run at all
What to Check
Check motor thermal
switch.
Check motor armature
resistance.
Check for motor short.
147
How to check
Motor should be at ambient temperature for this test.
Connect the yellow leads from the motor to an Ohm
meter. Meter should indicate continuity.
black (-)
red (+) Yellow
Connect the Red and Black leads from the motor to an
Ohm meter. Rotate the motor while checking for opens.
If an open is found replace the motor.
black (-)
Use an Ohm meter to check motor for shorts. Connect (–)
meter lead to motor case. Hold the (+) pole of the ohm-
meter against each motor cable. Meter should read open
on all wires.
Black (-)
Red (+)
red (+)
Yellow
Ground
Yellow
Original instruction