Problem Cause Remedy
Motor hums but does not run Mains voltage too low Check electrical connection
when switched on
Spray gun closed Actuate spray gun
Pump stiff Turn motor by hand as described
(blocked or frozen) for "Starting up after prolonged
storage" (User Manual)
Extension lead with wrong Use correct cable cross-section
cross-section (see User Manual)
Motor does not start Connector has not been plugged Check plug, cable and switch
when switched on in correctly, break in power supply
Mains fuse has been tripped Refit mains fuse
Motor stops Overload protection (in winding) Check that supply voltage matches
tripped because motor specified machine voltage.
overheating or overloaded Switch off machine and allow
to cool for at least 3 minutes.
Spray head soiled Clean nozzle in spray head
Note: A correct power supply is essential if the machines are to operate faultlessly. The voltage drop in the
motor during operation must not be excessive, otherwise the motor will turn too slowly and take up too much
power. This causes the windings to heat up and the overload switch cuts out the machine after only a short
period of operation. Moreover, the machine cannot build up the rated power output and problems may arise
during the starting phase, i.e. between switching on the motor and reaching the nominal speed.
4.2 Electric motor
RE 140 K, 160 K 7
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