Bosch Refrigerator Not Cooling — How to Fix

What Does This Error Mean?

A Bosch fridge that is not cooling has one of three causes: blocked condenser coils, a failed fan (E26 or E29), or a compressor fault (E27). Start by pulling the fridge away from the wall and vacuuming the condenser coils and fan area at the back — this resolves about 30% of cooling failures without any parts. Also check that the fridge is not overfilled — a packed fridge blocks the internal airflow and causes uneven or poor cooling.

Affected Models

Bosch Series 2 Fridge-Freezer
Bosch Series 4 Fridge-Freezer
Bosch Series 6 Fridge-Freezer
Bosch Series 8 Fridge-Freezer
Bosch French Door Refrigerator

Common Causes

Condenser coils at the back heavily coated with dust, reducing heat dissipation significantly
Condenser fan failed (E26) — the fan is not blowing air over the condenser coils
Evaporator fan failed (E29) — cold air is not being circulated from the freezer into the fridge
Defrost system failed (E28) — ice has built up on the evaporator, blocking all airflow
Compressor or start relay failed (E27) — the refrigeration cycle has stopped entirely

How to Fix It

Check the temperature setting

Confirm the fridge temperature is set to 3–4°C and the freezer to -18°C. It sounds obvious, but temperature settings are accidentally changed regularly. Check the control panel for any recent changes.
Check the door seals

Inspect the door gaskets on both the fridge and freezer doors. Press a piece of paper against the seal and close the door — you should feel resistance when pulling the paper out. A seal that offers no resistance is letting warm air in.
Clean the condenser coils

Pull the fridge from the wall and vacuum the condenser coils (the metal grid at the back) and the fan area below. Thick dust is a common and easily fixed cause of cooling failure. Ensure 10 cm of clearance behind and above the fridge after pushing it back.
Listen for the fans

With the fridge running, open the freezer and press the door switch. You should hear the evaporator fan running inside. Also listen at the back of the fridge for the condenser fan. Silence from either fan means that motor has failed — check for E26 or E29.
Listen for the compressor

Place your hand on the back of the fridge — you should feel warmth from the condenser and hear the low hum of the compressor cycling on and off every 20–30 minutes. Complete silence with a cold-to-the-touch back means the compressor has stopped — check for E27.

When to Call a Professional

If the condenser is clean, both fans are running, and the fridge is still not cooling, the compressor or refrigerant system has failed. This requires a certified technician — refrigerant handling is regulated and cannot be done without certification.

Frequently Asked Questions

Bosch fridge not cooling but freezer works fine — why?

When the freezer is cold but the fridge is warm, the evaporator fan (E29) has failed or ice has blocked the vent between the two compartments. The compressor and freezer are working, but cold air is not reaching the fridge section.

Bosch fridge is not cooling after a power cut — what happened?

A power surge during the outage can cause the compressor's thermal overload to trip. Switch the fridge off for 2–3 hours, then switch it back on — the thermal overload resets once the compressor cools down.

Bosch fridge door was left open — now it is not cooling. What should I do?

A prolonged open door floods the evaporator with warm air, causing a heavy ice build-up that blocks airflow. Switch the fridge off, allow 24 hours for the ice to melt with the doors open, then switch back on.