Help - Bosch fridge freezer making a loud humming noise

A constant loud hum/buzz from the back of a fridge freezer is often either the compressor, a fan motor, or vibration from pipework/panels. Without hearing it, the best approach is to narrow down exactly when it happens.

1. First, pull the appliance slightly forward and check it is level and not touching the wall or cabinets. A Bosch can transmit quite a lot of vibration if the rear pipework, drain tray, or back panel is just touching something.

2. Listen for where the sound is strongest: - Low down at the back: usually compressor/vibration related. - Higher up or inside the freezer section: more likely an evaporator fan.

3. Open the freezer door. On many models the internal fan will stop when the door is opened (or when you hold the door switch in). If the noise stops, that points to the fan area rather than the compressor.

4. Check if the noise is constant all day, or only when cooling. A compressor hum that starts and stops is normal, but if it has become much louder than usual it could be struggling, vibrating badly, or running continuously because of a cooling issue.

5. Look behind the appliance for anything loose: pipework touching the cabinet, a rattling rear cover, or the condensate tray vibrating on top of the compressor.

6. If cooling performance is still normal, it may simply be a vibration fault. If it is also not cooling properly, running hot, or never cutting out, that needs proper diagnosis.

Isolate the appliance from the mains before inspecting any internal or rear components. If the noise is from the sealed refrigeration system, compressor, or any mains electrical part, it’s best dealt with by a qualified engineer.

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