One of the most common issues with Hamilton mini-fridges and compact refrigerators is when the unit powers on, the light works, the fan spins, but no cooling occurs. This is usually due to a failed start capacitor or overload protector, preventing the compressor from starting. Budget-friendly components in these units are more prone to burnout, especially if the unit is frequently unplugged or used with power strips. Replacing the start device usually solves the issue.

If your Hamilton fridge runs non-stop but doesn't get cold, there may be a refrigerant leak or partial blockage in the capillary tube. Compact cooling systems are sealed and non-serviceable in most models, so when efficiency drops, there's little room for recovery. Continuous compressor operation also raises internal temperatures and may shorten the unit's lifespan. If caught early, repairs might be possible, but in many cases, replacement is more cost-effective.

In Hamilton refrigerators without automatic defrost (which is common), ice often builds up along the back interior wall. This occurs when warm air enters through a loosely sealed door or when the thermostat sticks in the on position. As ice thickens, airflow drops and cooling efficiency suffers. Manually defrosting the unit every few weeks is recommended, but if icing occurs too quickly, the thermostat may need to be replaced.

Hamilton fridges are known for their simplicity, but also for louder operation. A noticeable hum, rattle, or buzz may come from the compressor mounts loosening over time, especially if the unit isn't level. In smaller models placed on desks or counters, vibrations can echo through furniture surfaces. Using vibration pads or adjusting the feet can reduce noise. If the noise increases suddenly, the fan or motor may be wearing out.

Most Hamilton refrigerators use a mechanical thermostat with a basic numbered dial. Over time, the dial can strip or detach internally, leading to no temperature change even when adjusted. In some models, the thermostat may also become stuck, causing the unit to stay too cold or too warm regardless of settings. Replacing the dial assembly or thermostat itself is usually a simple fix.