Husqvarna 525HE3 Workshop Manual page 41

Idle speed (low speed)
The idle speed does not become
stable
The engine stops when idling
1371 - 001 - 02.07.2020
The stop screw for the throttle does not operate correctly
Blocked fuel filter
Blocked fuel hose
Air in fuel pipes
Incorrect/unsatisfactory fuel
The needle valve is defective
The carburetor is not attached correctly
The lever arm of the needle valve does not operate correctly
The needle valve spring is not attached correctly
The control diaphragm is damaged
The needle valve is worn
Object in the needle valve guide
The stop screw for the throttle does not operate correctly
Blocked fuel filter
Blocked fuel hose
Air in fuel pipes
The needle valve is defective
Defective heat insulation seal
The lever arm of the needle valve is too high
The lever arm of the needle valve does not operate correctly
The spring of the needle valve is damaged
The needle valve spring is not attached correctly
The needle valve is worn
Object in the needle valve guide
Troubleshooting - 41