Viessmann Vitodens 100 WB1B Boiler Fan Assembly 7833759

Product Overview

The Viessmann Vitodens 100 Boiler Fan Assembly (Part Number: 7833759) is a replacement combustion fan component intended for selected Viessmann heating systems.

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

Correct fan operation is important for the boiler's ignition sequence 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 parts should be professionally tested to confirm correct operation before installation.

Technical Insight & Common Failure Symptoms

The boiler fan is part of the combustion system and helps supply the airflow required during burner operation. Its operation is coordinated with the boiler's electronic controls and safety functions.

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

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

• Fan failing to start or operate correctly.

• Intermittent fan operation.

• Unusual noise or vibration from the fan assembly.

• Boiler failing to complete its normal ignition sequence.

• Boiler failing to ignite or fire correctly.

• Combustion airflow-related faults.

• Boiler entering a safety lockout.

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. Professional diagnosis is recommended before replacement.

Compatibility

This part (MPN: 7833759) is associated with selected Viessmann Vitodens 100 WB1B boiler systems.

Please verify the exact boiler model, serial number, part number and fan specifications 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, combustion, flue integrity and operational safety checks must be completed before the boiler is returned to service.