Potterton Baxi Gas Valve VK4105C1009 402552

Product Overview

The Potterton Baxi Gas Valve (Part Numbers: VK4105C1009 and 402552) is a gas-control component designed for use in selected Potterton boiler systems, including the Suprima range.

Manufactured to the Honeywell VK4105C1009 specification, this component forms part of the boiler's combustion system, controlling and regulating the supply of gas to the burner in response to signals from the appliance's electronic control system.

The valve incorporates an automatic safety shut-off mechanism and servo pressure regulation, supporting controlled gas delivery during ignition and burner operation.

Its regulating mechanism helps maintain appropriate gas pressure conditions, while the electrically operated safety valve controls gas flow according to the boiler's operating requirements.

Correct operation is essential for maintaining stable burner performance, appropriate gas supply conditions and safe, reliable combustion.

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 gas valves should be professionally inspected and tested to confirm their condition, correct operation and suitability for installation.

Technical Insight & Common Failure Symptoms

The Honeywell VK4105C1009 Gas Valve is an electrically operated gas-control component incorporating servo pressure regulation and automatic safety shut-off functions. It works alongside the boiler's printed circuit board (PCB), ignition system and flame supervision controls to manage gas delivery during burner operation.

Electrical faults, internal mechanical deterioration, damaged valve connections or problems affecting the pressure-regulating mechanism may interfere with normal gas flow, ignition performance or burner stability.

Possible symptoms that may indicate a faulty gas valve or associated combustion control problem include:

• Boiler failing to ignite despite receiving a heating demand.

• Burner failing to establish or maintain a stable flame.

• Repeated ignition attempts or unsuccessful burner start-up.

• Intermittent burner operation or unexpected shutdowns.

• Boiler entering an ignition-related safety lockout.

• Gas valve failing to respond correctly to electronic control signals.

• Incorrect gas pressure or regulation identified during professional testing.

• Abnormal combustion performance detected during servicing.

• Visible damage, corrosion or deterioration affecting the valve or its electrical connections.

These symptoms do not necessarily confirm a faulty gas valve, as similar problems may result from the gas supply, ignition components, wiring, PCB, flame detection equipment or other combustion controls. Correct professional diagnosis should be carried out before replacing the component.

Safety Advice

Boiler gas valves are safety-critical components within gas-fired heating appliances. Inspection, removal, installation and adjustment 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's gas and electrical supplies before carrying out any work and follow the manufacturer's installation and servicing instructions.

Ensure the correct gas valve model, part number, gas type and pressure-regulation requirements are verified before installation. Gas valves with similar appearances may have different operating characteristics or specifications.

Never attempt to modify, bypass or adjust gas valve safety mechanisms outside the manufacturer's specified procedures.

Appropriate gas-tightness testing, gas supply pressure checks, ignition testing, combustion analysis and operational safety checks must be completed before returning the boiler to service.

If a gas leak is suspected, do not operate the appliance and follow the appropriate gas emergency procedures.