Sime Combustion Chamber O-Ring 6248870

The Sime 6248870 is a combustion chamber O-ring used to seal the joint at the combustion chamber on compatible Sime gas boilers. It forms a gas-tight seal at the chamber face, preventing flue gases from escaping into the appliance casing. The ring is a service item and is typically renewed whenever the combustion chamber is opened.

• Visible cracking, flattening or perishing of the O-ring when the combustion chamber is opened
• Flue gas smell or combustion readings that drift from the expected values
• Water or condensate weeping from the combustion chamber joint
• Discolouration or hardening of the seal material after long service
• The seal is disturbed or removed during burner or heat exchanger work

• Confirm the boiler model and serial number against the fitment list, as several Murelle variants share similar model names
• Check the condition of the combustion chamber face and seal groove before refitting
• Confirm whether any other combustion chamber seals or gaskets need renewing at the same time
• Work on the combustion chamber must be carried out by a Gas Safe registered engineer