Cordless Shark vacuum powers on but shuts off immediately when the trigger or power button is pressed; error pattern suggests control fault

Safety first: Remove the battery before inspecting the handle or any electrical connections. Do not operate the vacuum if it has been exposed to liquids.

• 1. Inspect the trigger or power button: Check for physical damage, stickiness, or misalignment. Press it repeatedly with the battery removed to see if it moves freely and returns fully.
• 2. Check for signs of liquid damage: Look around the handle seams and battery compartment for corrosion, residue, or moisture. If you suspect liquid ingress, do not continue using the vacuum; internal components may be compromised.
• 3. Reseat connections (if accessible): On some models, you can remove screws in the handle housing to access the trigger switch and wiring. If you are comfortable and your warranty has expired, carefully open the housing and check that all connectors are firmly seated. Do not disturb or short any components.
• 4. Test with another battery: A weak battery can sometimes mimic control faults. If available, install a known‑good battery and test again.
• 5. Replace trigger switch or main PCB: If the trigger feels loose or does not click, the switch may need replacement. If the switch is mechanically sound but the vacuum still shuts off instantly, the main control PCB is likely faulty. These repairs are advanced; consider professional service or replacing the main body assembly.