Leave the battery disconnected
Connect the charger to mains power while leaving it disconnected from a battery. Keep the output connections safely separated and follow the product’s normal electrical precautions.
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Exercise the button
CTEK suggests periodically pressing RESET, then repeating several times with slightly firmer pressure. Its explanation is that oxidized or stuck contact surfaces may respond to this external operation. Use the button itself; do not apply liquid cleaner or insert a tool into the case.
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Stop if it stays unresponsive
If the button still does not work, CTEK says it is likely defective. Record the charger model and the result and arrange support or service. Repeated battery reconnection is not a useful substitute for a functioning control.
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Sources / references 1
- CTEK Assist — RESET button does not work ↗Reviewed Oct 8, 2026
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