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Bosch Refrigerator Error Code E20

Call a professionalReviewed November 2026Checked against manufacturer documentation
What this code means
E20: Communication error between the main control board and the display control module

E20 means the main control board and the display control module have stopped communicating, usually because of a loose or damaged wire harness or a failed board. Reset the power first; if the code returns, a technician needs to inspect the harness and both boards.

Fix level
Call a professional
The checks on this page are preliminary. The likely fix involves a part, wiring or the control board.
Time to run the checks
About 15–30 minutes
For the 3 checks on this page — not a full repair.
You may need
No special tools
The checks below use basic household items only.
Parts that may be involved
Main control board, Display control module (+1 more below)
Parts are model-specific; see the note below before ordering.

Common causes

  1. Loose connection on the wire harness between the main control board and the display control module
  2. Damaged wire harness between the two boards
  3. Main control board or display control module has failed

What to check, in order

Safety first. Switch the appliance off and unplug it before checking anything inside it. If you are not comfortable with any step, stop and call a technician.
  1. Unplug the refrigerator for at least 5 minutes, then restore power and check whether the display and controls respond normally.
  2. Note exactly what does and does not work — display lit or blank, cooling running or stopped — and give those details to the technician.
  3. If E20 returns, the harness connections and both boards need inspection, which means opening the control housings — a technician job. If the fridge has stopped cooling, move perishable food to a cooler box in the meantime.

Clear the code and test

  1. Fix what the checks above found first. Clearing the code without fixing the cause only brings it back.
  2. Plug the appliance back in and restore its water supply if it has one.
  3. Run the shortest programme and watch the point where the code appeared before.
  4. If the programme finishes with no code, the fault is cleared. If the code returns, write it down before calling a technician — it speeds up the diagnosis.

When to call a professional

This code usually points to a faulty part, wiring or the control board on a Bosch refrigerator. Run the checks above to rule out the simple causes, then book a technician — and book one straight away if any of these apply:

  • The code comes back after you have run the checks and a test cycle.
  • You smell burning, see sparks or scorch marks, or the breaker trips.
  • Water is leaking and you cannot stop it at the tap.
  • The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.

When you call, give the brand, the code E20, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.

Repair or replace?

This fault is in professional territory: the fix usually means a major part or board-level work, and the labour adds up. If your machine is already well into its service life, get the repair quote first, then compare it with the price of a current equivalent model before you decide. Paying a large share of a new machine's price to repair an old one is rarely the better deal; replacing a machine over one cheap fault is wasteful too.

Parts that may be involved

Main control boardDisplay control moduleWire harness

Parts are model-specific. Find your model number first — usually on a label inside the door, on the door frame or on the back — and match the part to that number before ordering.

Questions people ask about E20

What does E20 mean on a Bosch refrigerator?

E20 means: Communication error between the main control board and the display control module. E20 means the main control board and the display control module have stopped communicating, usually because of a loose or damaged wire harness or a failed board. Reset the power first; if the code returns, a technician needs to inspect the harness and both boards.

Can I fix Bosch E20 myself?

Only the preliminary checks. Code E20 usually means a part, wiring or the control board has failed, which is a technician job. Run the checks to rule out simple causes before you book.

How do I clear Bosch E20?

Fix the cause first — clearing the code on its own brings it straight back. Then restore power and water, run the shortest programme, and watch the stage where the code appeared. If the programme finishes with no code, it is cleared.

Sources checked

The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.

Other Bosch refrigerator codes

Bosch E01Refrigerator compartment temperature sensor defectiveBosch E02Freezer temperature sensor fault on side-by-side models; ice maker or ice/water control fault on current French-door modelsBosch E03Temperature-controlled drawer temperature sensor fault on side-by-side models; dispenser user-interface fault on current French-door modelsBosch E04Freezer condenser temperature sensor faultBosch E10Main control board (power module) defectiveBosch E11Display control module defectiveBosch E15Ambient temperature sensor defectiveBosch E21Communication error between the display control module and the ice and water dispenser control module