Bosch Refrigerator Error E20 — What It Means & How to Fix It

What Does This Error Mean?

Error E20 means the evaporator fan motor inside the freezer compartment has stopped or failed. This fan circulates cold air throughout both the freezer and fresh food compartments. Without it, temperatures will rise quickly and food safety is at immediate risk.

Affected Models

Bosch Serie 6 KGN86AIDR
Bosch Serie 4 KGN39VXBT
Bosch French Door B36CT80SNS
Bosch Counter-Depth B11CB81SSS
Bosch Serie 8 KGN86AIDP

Common Causes

Evaporator fan motor bearings have seized preventing the motor from spinning
Ice buildup around the fan blade blocking rotation (common after a defrost failure)
Fan blade cracked or broken causing mechanical imbalance and motor shutdown
Wiring harness to the evaporator fan damaged or connector pulled loose
Control board has failed to supply correct voltage to the fan motor

How to Fix It

Unplug the refrigerator and remove all food from the freezer compartment.

You will need to remove the freezer back panel to access the evaporator fan — empty the compartment first.
Remove the back panel inside the freezer compartment to expose the evaporator coils and fan assembly.

The panel is held by screws — keep track of all fasteners as you remove them.
Check for ice buildup around the fan blade — if ice is present, manually defrost using a hair dryer on low.

Ice-locked fans are a common result of a prior defrost failure (E21) — always check error history for related codes.
Spin the fan blade by hand to check for free rotation — if it is stiff or grinds, the motor has failed.

A good evaporator fan motor blade should spin freely and quietly with no wobble or resistance.
Test the fan motor for continuity and correct supply voltage using a multimeter.

No continuity means a failed winding; no supply voltage points to the wiring harness or control board.
Replace the evaporator fan motor with the correct Bosch OEM part, reassemble the panel, and restore power.

Give the unit 30–60 minutes to return to target temperatures after reassembly before declaring the repair successful.

When to Call a Professional

Call a technician if the evaporator fan motor tests fine but E20 persists — the issue is likely the control board. Evaporator fan replacement costs $80–$200 in parts and labor for most Bosch models. Do not delay repairs; a failed evaporator fan will cause complete cooling failure within hours.

Frequently Asked Questions

What is the difference between E19 and E20 on a Bosch refrigerator?

E19 is the condenser fan at the bottom rear of the unit — it cools the compressor. E20 is the evaporator fan inside the freezer — it circulates cold air throughout the compartments. Both are critical faults, but E20 affects food temperature directly and faster.

Can ice around the evaporator fan cause E20 without the motor actually being broken?

Yes — ice blocking the blade is one of the most common causes of E20. Manually defrosting the coil area may clear the error without any parts replacement. If ice was the cause, also check for E21 (defrost heater fault) to prevent a recurrence.

How long can I store food in the freezer with E20 active?

Once the evaporator fan stops, the freezer temperature will begin rising. Frozen food stays safe for about 24–48 hours if the freezer door is kept closed. If you cannot repair it within 24 hours, transfer frozen food to another freezer.