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Error code reference

Bosch Dryer Error Code E:7110

COM module (HomeConnect)

Bosch codesBosch dryer codes

COM module (HomeConnect) - general error (4-digit equivalent of E:109).

First step from the service manual

Check wire harness between COM module and Operating Unit.

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

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What E:7110 means on a Bosch dryer

Error code E:7110 on a Bosch dryer indicates a general communication fault within the COM module, which is the HomeConnect wireless communication module responsible for enabling smart home connectivity and remote control functionality. This code is the 4-digit equivalent of the older E:109 fault designation and points to a failure in the data exchange between the COM module and the Operating Unit (the main control interface board). The COM module communicates with the Operating Unit over a dedicated wire harness, and any disruption in that signal path will trigger this fault.

The most common root causes involve physical connection problems rather than outright component failure. A loose, corroded, or damaged connector at either end of the wire harness between the COM module and the Operating Unit can interrupt communication and generate this error. Vibration over time can work connectors loose, and heat cycling inside the dryer cabinet can degrade connector contacts or cause wire insulation to crack.

If the wire harness checks out as intact and properly seated, the fault may lie within the COM module itself. An internally failed COM module cannot establish proper communication with the Operating Unit regardless of harness condition. Less commonly, the Operating Unit may be the source of the fault if it is unable to send or receive data on that communication bus. Diagnosis should proceed from the harness inspection inward toward the individual components.

Source: manufacturer service documentation.

Common causes of E:7110

  1. 01

    Loose or disconnected wire harness connector

    Wiring / connection

    The wire harness connecting the COM module to the Operating Unit may have a connector that is partially unseated or has worked loose from vibration. Inspect both ends of the harness for firm, fully latched connections.

  2. 02

    Damaged or corroded wire harness

    Part replacement

    The harness wiring itself may have a broken conductor, pinched section, or corroded contact pins that prevent reliable communication. Visually inspect the full length of the harness and check for continuity.

  3. 03

    Failed COM module

    Part replacement

    The HomeConnect COM module may have an internal failure that prevents it from communicating with the Operating Unit. If the harness tests good, the COM module is the next component to suspect for replacement.

  4. 04

    Faulty Operating Unit

    Part replacement

    In less common cases, the Operating Unit itself may be unable to send or receive data on the communication bus, causing the COM module fault to register. This is typically diagnosed after ruling out the harness and COM module.

See the test procedure for each cause

Frequently asked questions about E:7110

What does E:7110 mean on a Bosch dryer?
E:7110 is a general communication error for the HomeConnect COM module, which is the component that enables Wi-Fi and smart home connectivity. It indicates a failure in the communication link between the COM module and the Operating Unit. This code is the 4-digit equivalent of the older E:109 fault code on Bosch dryers. The first step in diagnosis is inspecting the wire harness between those two components.
Can I fix E:7110 myself on a Bosch dryer?
A knowledgeable DIYer can attempt the initial diagnostic step, which is checking and reseating the wire harness between the COM module and the Operating Unit. If the harness is intact and properly connected but the error persists, replacing the COM module or Operating Unit typically requires familiarity with appliance disassembly and component handling. If you are not comfortable working inside the dryer cabinet, a qualified technician should perform the repair.
Is it safe to use my Bosch dryer when E:7110 is displayed?
E:7110 relates specifically to the HomeConnect smart communication module and does not directly involve the heating or motor systems. However, you should consult a technician to confirm the fault is isolated to the COM module before continuing to run the appliance. Operating with unresolved control board communication faults carries some risk of unexpected behavior.
How much does it cost to repair a Bosch dryer with error code E:7110?
If the fix is simply reseating a loose wire harness connector, there may be no parts cost, though a service call fee would still apply if a technician performs the work. Replacing a COM module typically costs between $80 and $200 for the part, plus labor. If the Operating Unit requires replacement, costs can range from $150 to $400 or more depending on the model and labor rates in your area.
Will resetting my Bosch dryer clear the E:7110 error?
A power reset may temporarily clear the E:7110 code, but if the underlying communication fault between the COM module and the Operating Unit is not resolved, the error will return. Resetting should be considered a diagnostic step rather than a repair. Persistent reappearance of the code after a reset confirms that a physical inspection of the wire harness and the components is necessary.

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