Worcester Bosch Gas Valve CE427 8738717458

The Worcester Bosch CE427 gas valve, part number 8738717458, is a replacement gas control valve used across the Worcester Bosch Greenstar range of combi and condensing boilers. It sits between the gas supply and the burner assembly, opening and closing on demand from the boiler's control board and modulating the gas rate to suit the heating or hot water load. It is a serviceable component, so it is replaced when the valve fails to open, close or hold a steady rate.

• The boiler fails to light, or lights and then drops out shortly afterwards
• Repeated lockouts on the boiler display with no obvious ignition
• The burner will not modulate, so the boiler runs at a fixed rate or cycles harshly
• Flame failure or flame supervision faults logged against the gas train
• The valve body shows signs of leakage, contamination or a sticking solenoid

• Check the GC number and appliance serial plate against the compatibility list to confirm the valve suits your model
• Compare the numbers on the existing valve with the alternative and previous part numbers listed here before ordering
• Inspect the gas valve gasket or seal and replace it if it is compressed, hardened or damaged
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.