husqvarna · Workshop manual
The engine continues to run even after attempting to shut it down, usually by turning the key to the 'OFF' position. This is a critical safety issue and indicates a problem with the shutdown circuit.
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Check the black cable and connectors between J1 (pin 6) and the engine for damage.
Inspect the black cable and connectors between J7 (pin 5) and the key switch.
Examine the blue cable and connectors between J7 (pin 6) and the key switch for any faults.
Verify that the black cable from J7 (pin 5) and the blue cable from J7 (pin 6) make contact when the key is in the 'OFF' position. If not, replace the key switch.