Viessmann Vitodens 100 WB1A System 24kW Boiler Fan Assembly 7823839

Product Overview

The Viessmann Vitodens 100 Boiler Fan Assembly (Part Number: 7823839) is a replacement combustion fan component associated with selected Viessmann heating systems.

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

Correct fan operation is important for the boiler to complete its normal ignition sequence and operate safely.

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 inspected and tested to confirm correct operation before installation.

Technical Insight & Common Failure Symptoms

The boiler fan supports the combustion process by supplying airflow during burner operation. It works alongside the appliance's electronic controls and safety systems to maintain the required combustion air supply.

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 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.

• 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: 7823839) is associated with the Viessmann Vitodens 100 WB1A System 24kW boiler range, subject to confirmation of the appliance's exact specification.

Please verify the boiler model, serial number, original 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.