What steps should I take if cleaning the sensor doesn't resolve the 'Error #3649'?

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Grade: Education Subject: Support
What steps should I take if cleaning the sensor doesn't resolve the 'Error #3649'?
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If cleaning doesn't work, try resetting the watch. Press and hold the 'Start/Stop' button for approximately 10 seconds. If the error persists after a reset, it's likely a hardware issue requiring further investigation or repair.