Likely causes: improper carafe placement, a cracked water reservoir, or a failed internal seal.
- Ensure the glass carafe is correctly seated on the warming plate. The lid must be fully closed.
- Check the water reservoir for hairline cracks. Fill it with water and look for drips outside the unit.
- Inspect the area around the showerhead and brew basket for mineral buildup preventing a seal.
If that didn't work: The internal water tube or a seal may have failed. This requires disassembly by a qualified technician. The unit should be unplugged and not used until repaired.
Heads up: Never operate the coffee maker without the carafe in place and properly seated. This can cause immediate overflow and leakage.