Bosch Fridge Not Cooling — Fix

What Does This Error Mean?

If your Bosch fridge is not cooling, check the condenser coils at the back of the unit and ensure there is at least 5 cm of clearance behind the fridge. Dirty coils and blocked ventilation are the most common causes of Bosch cooling failures.

Affected Models

Bosch Serie 2 Fridge-Freezer
Bosch Serie 4 Fridge-Freezer
Bosch Serie 6 Fridge-Freezer
Bosch Serie 8 Fridge-Freezer
Bosch NoFrost Refrigerator

Common Causes

Condenser coils clogged with dust — common on under-counter and integrated models
Insufficient ventilation behind or above the fridge
Defrost system failure — ice blocking the evaporator on NoFrost models
Evaporator fan motor failed
Compressor not starting — relay or capacitor fault

How to Fix It

Check clearance and ventilation.

Bosch fridges require at least 5 cm of free space behind the unit and 1 cm above the top. If the fridge is built into a cabinet, ensure the ventilation grilles at the top and bottom of the cabinet are not blocked. Improper ventilation causes the compressor to overheat and reduce cooling.
Clean the condenser coils.

Pull the fridge away from the wall. The condenser coils are at the back on most Bosch models. Vacuum off dust and pet hair with a brush attachment. On integrated models the coils may be at the bottom behind the plinth.
Check for ice build-up on the evaporator.

Remove items from the freezer and unscrew the rear panel. A heavy layer of ice on the evaporator means the NoFrost defrost cycle has failed. Unplug the fridge and leave all doors open for 24 hours to manually defrost, then restart.
Verify temperature settings.

Check the fridge is set to between 3°C and 5°C and the freezer to -18°C. Turn the dial to the correct position or set the correct value on the digital display.

When to Call a Professional

If ventilation is good, the coils are clean, and manually defrosting the evaporator only fixes the issue temporarily, the defrost heater or thermostat has failed and needs professional replacement.