Keston Repair Service

What does error E02 mean on a Keston C36 boiler?

Error E02 on a Keston C36 boiler indicates false flame detection - the boiler is detecting a flame signal before ignition has started. This requires a Gas Safe registered engineer to check the power supply polarity and flame sensing electrode.

What does error F3 mean on a Keston S30 boiler?

Error F3 on a Keston S30 boiler indicates a fan fault. Contact a Gas Safe registered engineer to check the fan, wiring, and speed sensor.

What does error E67 mean on a Keston Qudos boiler?

Error E67 on a Keston Qudos boiler indicates low water pressure below 0.4 bar. Use the filling loop to repressurise the system to approximately 1.2 bar. If pressure drops repeatedly, check for leaks and contact an engineer.

What does error L2 mean on a Keston S30 boiler?

Error L2 on a Keston S30 boiler indicates flame loss lockout, commonly caused by a frozen condensate pipe in winter. If you smell gas, do not operate any switches or appliances, ventilate the area if safe to do so, evacuate the property, and call the gas emergency services from outside. Otherwise, locate the condensate pipe and pour warm water along it to thaw. Reset the boiler once thawed. If the fault persists, contact a Gas Safe registered engineer.

What does error E03 mean on a Keston C40 or C55 boiler?

Error E03 on a Keston C40 or C55 boiler indicates the gas valve is faulty or not properly connected. If you smell gas, do not operate any switches or appliances, ventilate the area if safe to do so, evacuate the property, and call the gas emergency services from outside. Do not attempt any repairs. Contact a Gas Safe registered engineer immediately as gas valve faults must only be handled by qualified professionals.

What should I do if my Keston boiler has no hot water but the heating works?

This typically indicates a problem with the diverter valve. Check that hot water is enabled on your programmer and the temperature is set correctly. Listen for a clicking sound when running a hot tap. If the heating works but hot water does not, contact a Gas Safe registered engineer to inspect the diverter valve.

What should I do if my Keston boiler does not work after a power cut?

After a power cut, first check that the electrical supply has been restored. Check the system pressure is between 1.0 and 1.5 bar. Press the Restart button on the boiler fascia. You may also need to reset the programmer clock to the correct time. If an error code is displayed or the boiler fails to restart, contact a Gas Safe registered engineer.

What warranty do Keston boilers have?

Keston Combi 2 and System 2 boilers come with a 5-year warranty as standard, which can be extended to 7 years when installed with a Keston System Filter and both are registered together. Keston Heat 2 boilers have a 2-year standard warranty, upgradeable to 5 years with free commissioning by Keston. Annual servicing by a Gas Safe registered engineer is required to maintain the warranty.

How can I save on energy bills with my Keston boiler?

Schedule an annual service to maintain peak efficiency. Keep the boiler pressure correct and bleed radiators regularly. Use programmable or smart thermostats to avoid heating when the home is empty. Turn radiators down or off in rooms that are rarely used. Consider lowering the flow temperature on modern condensing boilers.

How often should my Keston boiler be serviced?

Keston boilers should be serviced annually by a Gas Safe registered engineer. This annual service maintains operational efficiency and safety. The best time to arrange a service is during summer when engineers are less busy.