precisely meters fuel in response to signals from the boiler’s control system, supporting stable ignition, efficient combustion and accurate modulation of heat output. Integrated safety shut-off features provide reliable protection against unsafe gas flow by stopping fuel delivery if a fault or unsafe condition is detected, helping to protect internal components and maintain secure operation.

This gas valve is compatible with Potterton Suprima CVI series boilers that reference part number 402550 in their service and parts documentation. To ensure correct fitment and dependable performance, always check that the part number on your existing valve matches before installation, as gas control components and connection interfaces vary between models and system configurations.

Supplied ready for direct replacement, the 402550 Honeywell Suprima CVI Gas Valve integrates with the boiler’s existing gas inlet, control wiring and mounting points when fitted by a qualified Gas Safe engineer. Choosing this genuine Potterton/Honeywell component helps restore proper gas regulation, supports efficient combustion control and contributes to safe, reliable heating performance in compatible Suprima CVI boilers.