How to Disable Moisture Detected on Samsung S21 (UK Step-by-Step)

How to Disable Moisture Detected on Samsung S21 (UK Step-by-Step Guide – 2025)

The Samsung Galaxy S21 is a premium device, but many UK users — including those in London, Manchester, Birmingham, and Glasgow — have encountered the persistent “Moisture Detected” warning. It can prevent USB-C charging, disable fast charging, and appear even when the phone is dry.

From hands-on testing and feedback from local repair centres, this step-by-step guide explains how to disable or bypass the warning safely. I’ve personally resolved this issue on several S21 units after commutes in rainy London weather, and the methods below reflect practical UK experiences.

For related Samsung guidance, see the Samsung Hub. Topic hubs that may help include Battery & Power and Connectivity & Network.

Understanding the “Moisture Detected” Warning on S21

The S21 uses a sensitive USB-C moisture sensor that detects potential water ingress. Common UK triggers include:

• Condensation from moving between cold streets and warm indoor spaces
• Rain or accidental splashes during commuting
• High indoor humidity, particularly kitchens and bathrooms
• Lint or fibres in the USB-C port from winter clothing
• Heat generated during fast charging
• Occasional software glitches following One UI updates

UK forums reveal that many users experience the alert even without actual moisture.

Step 1: Determine if the Warning is False

• Wireless charging still works.
• The warning appears intermittently.
• Safe Mode allows USB-C charging.
• No visible water inside the port.

If these signs match, it’s likely a sensor misreading.

Step-by-Step Fix to Disable the Warning

1. Dry the USB-C Port

• Turn off your S21 and stand it upright for 30–60 minutes.
• Use gentle airflow, e.g., a fan, to help evaporation.
• Avoid direct heat from hairdryers or radiators.

UK tip: Standing the device upright encourages condensation to drain naturally.

2. Clean the Port

• Use a plastic or wooden toothpick, or an anti-static brush, to remove debris.
• Compressed air can safely remove particles.
• Avoid inserting metal objects that can damage the pins.

Technicians in Birmingham report that lint and fibres are the leading cause of false moisture warnings.

3. Disable Fast Charging

1. Settings → Battery → Charging
2. Switch off Fast Charging and Super Fast Charging

This prevents port heat from triggering the sensor.

4. Perform a Soft Reset

• Hold Power + Volume Down for 7–10 seconds to restart the device.

This often clears temporary sensor glitches.

5. Test in Safe Mode

1. Hold the power button → Long-press Power Off → Tap Safe Mode
2. Plug in the charger. If it works, a third-party app may be interfering.

6. Try a Different Cable or Charger

• Use Samsung-certified chargers (25W or 45W).
• Test alternative wall sockets to rule out power fluctuations.

7. Use Wireless Charging Temporarily

Qi-certified wireless charging allows continued usage while resolving USB-C issues.

Advanced or Last-Resort Options

• Some One UI versions allow temporary USB port alert bypass via hidden developer settings. This may reset after updates.
• Factory reset (Settings → General Management → Reset → Factory Data Reset) as a last resort. Backup all data first.

Most UK users will find the warning cleared by drying, cleaning, and safe mode steps.

Professional Repair in the UK

If the warning persists after 48 hours:

• Potential causes: corroded USB-C port, faulty moisture sensor, or damaged daughterboard
• Samsung authorised centres: £100–£140
• Local repair shops: £60–£95
• Mobile doorstep repair services (London & Manchester): £65–£90

City-Specific Notes

• London: Commuting rain often triggers false alerts.
• Manchester: Office humidity can cause alerts to last 24–48 hours.
• Birmingham: Lint and winter clothing fibres are common culprits.
• Glasgow: Indoor humidity and temperature swings trigger recurring warnings.

Preventive Tips

• Use a dust plug for the USB-C port.
• Avoid charging immediately after exposure to rain or cold weather.
• Do not charge in steamy kitchens or bathrooms.
• Inspect and clean the port every few months to prevent lint accumulation.

Conclusion

Disabling the Samsung S21 moisture detected warning in the UK is usually achievable with drying, cleaning, soft resets, Safe Mode, and using certified cables. If problems persist beyond 48 hours, consult authorised or trusted local repair centres in London, Manchester, Birmingham, or Glasgow. Following these steps ensures safe USB-C charging while preventing damage and recurring alerts.