How to Fix / Troubleshooting

Safety First: Unplug the refrigerator before cleaning or working near the compressor.

Steps:

Improve ventilation: Ensure there is adequate space around the refrigerator (typically at least several centimeters at sides, top, and back).
Clean condenser coils: Remove the rear lower panel and use a vacuum and brush to clean dust from the condenser coils and surrounding area.
Check condenser fan: With power restored briefly, verify that the condenser fan runs whenever the compressor is on. If not, unplug and replace the fan motor.
Reduce load: Avoid overloading the refrigerator and keep doors closed as much as possible.
Professional diagnosis: If H4 persists despite good airflow and a working fan, a sealed system issue may be present and requires a technician.

Display shows H4 and the compressor or condenser area is overheating.

Possible Causes