Storch Airless ST 550 Mode D'emploi page 216

Problem What to Check How to check
6. Connect the Red and Black leads from the motor to
an Ohm meter. A resistance is displayed while the motor
is turning. If this display is interrupted during the slow
turn, there is a cable breakage and the motor must be
replaced.
Black
Red
Yellow
7.Check motor thermal protection. Motor should be at
ambient temperature for this test. Connect the yellow
leads from the motor to an Ohm meter.
Meter should indicate continuity or Ohms depending on
the motor type.
Black
Red
Yellow
Original instruction 216