Stihl Thermal Cutout Activation

Unit shuts off randomly during use and restarts after cooling

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Blocked cooling vents, overworked motor due to clogs, failing thermal cutout switch, operating in high ambient temperature

Safety: Unplug and allow the unit to cool.

Clean vents and filters: Remove dust from all air inlets and outlets. Clean or replace motor intake filters.
Check for clogs: Ensure suction and solution paths are clear to reduce motor load.
Ventilation: Avoid using the unit in confined, hot spaces without airflow.
Thermal switch: If cutouts become more frequent despite cleaning, the thermal switch or motor may be deteriorating and should be inspected by a technician.

Medium 3/5

Motor Thermal Cutout

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