Viessmann Vitodens 100 WB1C 30 35 Combi Boiler Fan Assembly 7837255

Product Overview

The Viessmann Vitodens 100 Boiler Fan Assembly (Part Number: 7837255) is a combustion fan component intended for selected Viessmann heating systems.

The fan forms part of the boiler's combustion air supply system, providing the airflow required during burner operation and supporting the movement of combustion products through the appliance's flue system.

Correct fan operation is important for maintaining the boiler's normal ignition sequence, combustion performance and safe operation.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished components should be professionally inspected and tested to confirm correct operation before installation.

Technical Insight & Common Failure Symptoms

The boiler fan is an electrically driven component that supplies combustion air as part of the appliance's burner system. Its operation is coordinated with the boiler's electronic controls and combustion safety functions.

Over time, fan performance may be affected by motor wear, bearing deterioration, mechanical damage or electrical faults.

Possible symptoms that may indicate a fan or associated component problem include:

• Fan failing to start or operate correctly.

• Intermittent fan operation.

• Unusual grinding, rattling or vibration from the fan assembly.

• Boiler failing to complete its normal ignition sequence.

• Burner failing to ignite or maintain operation.

• Combustion airflow-related faults.

• Boiler entering a safety lockout.

• Visible damage or deterioration affecting the fan assembly.

These symptoms do not necessarily confirm a faulty fan, as similar problems may result from wiring, electronic controls, ignition components or restrictions within the combustion and flue system. Correct professional diagnosis should be carried out before replacement.

Compatibility

This part (MPN: 7837255) is associated with selected Viessmann Vitodens 100-W WB1C boiler systems.

Please verify the exact boiler model, serial number, part number, fan specifications and mounting arrangement against the manufacturer's technical documentation before ordering to ensure correct fitment.

Safety Advice

Boiler fan assemblies are safety-critical components within the combustion and flue system. Inspection, removal and installation must only be carried out by a Gas Safe registered engineer who is suitably qualified for the appliance and work being undertaken.

Always isolate the appliance before carrying out any work and follow the manufacturer's installation and servicing instructions. Appropriate fan operation, electrical safety, combustion, flue integrity and operational safety checks must be completed before the boiler is returned to service.