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David BowmanAug 18, 2025
Why does my Stihl Pressure Washer motor hum but not run when switched on?
- TTammy FarmerAug 18, 2025
The Stihl Pressure Washer motor may hum but not run due to several reasons: the mains voltage may be too low or improper (check the electrical connection, plug, cable, and switch); the extension cord may have the wrong cross-section (use an extension cord with a sufficient cross-section); the extension cord may be too long (connect the machine without an extension cord or with a shorter one); the mains circuit-breaker may have been tripped (switch off the machine, actuate the spray gun until water only drips out of the head, engage the safety catch, reset the mains circuit-breaker); or the spray gun may not be actuated (actuate the spray gun when switching on the machine).