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Error code reference

Bosch Refrigerator Error Code E3

UIM communication error

Bosch codesBosch refrigerator codes
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What the E3 error code actually means

The E3 code means your refrigerator's display panel and its main control board have stopped communicating properly. Think of it as the two computers inside the fridge losing their connection to each other. This can sometimes be fixed by unplugging the refrigerator for a few minutes, but if the code returns, a technician will need to inspect the wiring or replace one of the control boards.

Diagnostic procedure

The full E3 procedure

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of E3

Ranked by how often they cause this code
  1. 1Loose or disconnected wiring harness
  2. 2Corroded or damaged connector pins
  3. 3Failed User Interface Module (UIM)
  4. 4Failed main control board
  5. 5Power surge or voltage disruption

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Questions people ask about E3

What does E3 mean on a Bosch refrigerator?
E3 on a Bosch refrigerator indicates a UIM communication error, meaning the User Interface Module (the display control board) has lost communication with the main control board. This can be caused by a loose wiring connection, corroded connector pins, or a failed board. The refrigerator may still operate partially, but the fault should be diagnosed promptly to avoid further issues.
Will resetting my Bosch refrigerator clear the E3 error code?
A power reset by unplugging the unit for several minutes can clear E3 if the fault was caused by a temporary communication disruption such as a power surge. If the underlying cause is a hardware problem like a damaged connector, failed UIM, or faulty main board, the code will return after the reset. Clearing the code without addressing the root cause is only a temporary measure.
How much does it cost to repair a Bosch refrigerator E3 error?
Repair costs depend on the root cause. If only a wiring harness reconnection or cleaning of connector pins is needed, a service call fee is typically the primary expense, often in the range of $75 to $150. If a UIM or main control board requires replacement, parts and labor combined can range from $200 to $500 or more depending on the specific model and local labor rates.
Can I fix the E3 error on my Bosch refrigerator myself?
A homeowner can safely attempt a power cycle by unplugging the refrigerator for 5 to 10 minutes to see if the error clears. If the E3 code returns, further diagnosis involves inspecting the wiring harness and connectors, which requires accessing internal components. Replacing a UIM or main control board should be handled by a qualified technician familiar with refrigerator electronics.
Is the E3 error on a Bosch refrigerator a safety concern?
The E3 error itself is a communication fault and not a direct safety hazard. However, if the communication failure causes the refrigerator to lose control over its cooling functions, food spoilage becomes a risk. It is advisable to monitor internal temperatures and address the error promptly rather than leaving it unresolved for an extended period.

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