Coffee maker makes loud gurgling, sputtering, or popping noises during brewing.

Safety first: No immediate hazard, but always unplug before opening the unit.

Basic steps:

• Ensure the reservoir is filled to at least the minimum level before brewing.
• Run a full brew cycle with water only to purge air from the system.

Descale to reduce noise:

• Perform a vinegar descaling cycle (1:1 vinegar to water) to remove scale from the heating tube.

Check internal tubing:

• Remove the top cover and inspect silicone hoses for loose routing that may vibrate against the housing.
• Secure hoses with high-temperature cable ties or clips where appropriate.

When to replace:

• If noise persists and is accompanied by poor flow, replace the heating element / boiler assembly due to internal scale or damage.