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To change a 3 amp fuse in a boiler in the UK, follow these steps:

1. Turn Off the Power: Switch off the power to the boiler at the main circuit breaker or fuse box. Ensure that no power is flowing to the boiler.

2. Locate the Fuse: Find the fuse holder. This is usually found on the boiler itself or in a fused connection unit that provides power to the boiler.

3. Remove the Fuse Holder: If the fuse is in a holder, gently pull it out. You may need a screwdriver to open the fuse holder cover if it’s secured.

4. Check the Fuse: Inspect the fuse to see if it’s blown. A blown fuse will have a visible break in the metal filament or will appear discolored.

5. Replace the Fuse: Remove the blown fuse and replace it with a new 3 amp fuse. Make sure it is securely fitted.

6. Reassemble the Fuse Holder: Put the fuse holder back in its original position and ensure any covers are secured.

7. Restore Power: Turn the power back on at the main circuit breaker or fuse box.

8. Test the Boiler: Switch the boiler on to ensure it operates correctly with the new fuse.

Safety Precautions:

• If you are unsure or uncomfortable working with electrical components, it’s always best to consult a qualified electrician or technician.
• Always ensure the power is completely off before attempting any electrical work.

If the new fuse blows again, there may be an underlying issue with the boiler, and you should have it checked by a professional.