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Error code reference

Bosch Dryer Error Code E:7111

COM module (HomeConnect)

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COM module (HomeConnect) - D-Bus version protocol mismatch (4-digit equivalent of E:110).

First step from the service manual

Issue eFSB to DLCB; try reflashing the UIM module.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:7111 means on a Bosch dryer

Error code E:7111 on a Bosch dryer signals a D-Bus version protocol mismatch involving the COM module, which is the HomeConnect wireless communication module responsible for enabling the dryer's smart home and remote control functionality. This code is the 4-digit equivalent of E:110 and indicates that the software protocol versions between the COM module and another control module on the D-Bus communication network are incompatible or out of sync. The D-Bus is an internal serial communication bus that allows the dryer's various electronic modules to exchange data, and when protocol versioning does not match between nodes, reliable communication cannot be established.

The first diagnostic action for E:7111 is to issue an eFSB (electronic Field Service Bulletin command) to the DLCB (Download Control Board), followed by an attempt to reflash the UIM (User Interface Module). This process is intended to bring the firmware versions of the involved modules into alignment. A protocol mismatch of this type typically arises after an interrupted or failed over-the-air firmware update, a factory firmware discrepancy between replacement modules, or a corrupted flash memory state in the UIM or COM module. Because the error specifically involves HomeConnect, dryers without active HomeConnect usage may still trigger this fault if the COM module is present and communicating on the D-Bus.

Source: manufacturer service documentation.

Common causes of E:7111

  1. 01

    Interrupted or failed firmware update

    Wiring / connection

    If a HomeConnect or dryer firmware update was interrupted mid-process, the COM module or UIM may have been left with an incomplete or mismatched firmware version. This is the most common trigger for a D-Bus protocol mismatch error.

  2. 02

    UIM module firmware corruption

    Wiring / connection

    The User Interface Module can develop corrupted flash memory, causing it to report an incorrect protocol version on the D-Bus. Reflashing the UIM via the eFSB process is the primary remediation step for this condition.

  3. 03

    COM module firmware version mismatch

    Wiring / connection

    The HomeConnect COM module may be running a firmware version that is incompatible with the current firmware on other modules in the system, particularly after a partial update cycle or module replacement.

  4. 04

    Replacement module with mismatched firmware

    Wiring / connection

    If the COM module or UIM was recently replaced, the new component may have shipped with a firmware version that does not match the rest of the dryer's control system. A reflash or firmware alignment procedure is required to resolve this.

  5. 05

    Faulty or failed COM module

    Part replacement

    If reflashing the UIM and issuing the eFSB command to the DLCB do not resolve the error, the COM module itself may have a hardware fault preventing it from properly negotiating the D-Bus protocol version. Replacement of the COM module would be necessary in this scenario.

See the test procedure for each cause

Frequently asked questions about E:7111

What does E:7111 mean on a Bosch dryer?
E:7111 indicates a D-Bus version protocol mismatch involving the HomeConnect COM module. It is the 4-digit equivalent of error E:110 and means that two modules on the dryer's internal D-Bus communication network are running incompatible firmware protocol versions. This error is typically triggered by an incomplete firmware update or a module replacement that introduced a version conflict.
Can I fix E:7111 myself, or do I need a technician?
The primary fix for E:7111 involves issuing an eFSB command to the DLCB and reflashing the UIM module, which requires access to Bosch service-level diagnostic software and tools. This is not a repair that can be performed with standard consumer-level resets or app-based troubleshooting. A certified Bosch technician with the appropriate service interface equipment is needed to carry out this procedure properly.
Is it safe to use my Bosch dryer while it shows E:7111?
E:7111 relates to the smart communication system and HomeConnect functionality rather than the core heating or motor systems, so the dryer may still operate for basic drying cycles. However, remote monitoring, remote control, and HomeConnect-dependent features may not function reliably. If the error is accompanied by other fault codes or operational problems, stop using the dryer and have it serviced.
Will resetting the dryer clear the E:7111 error?
A standard power cycle or consumer reset is very unlikely to clear E:7111 because the underlying cause is a firmware protocol mismatch between internal modules, not a temporary communication glitch. Clearing this error requires the eFSB procedure directed at the DLCB and a UIM reflash using service-level tools. If the mismatch persists after those steps, a component replacement may be required.
How much does it cost to repair a Bosch dryer showing E:7111?
If the issue is resolved through firmware reflashing alone, repair costs typically reflect the service call and labor time, generally ranging from around $100 to $250 depending on your region and the technician's rates. If the COM module or UIM requires physical replacement, parts costs can add an additional $80 to $300 or more to the total, depending on the specific components needed.

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