BoilerFaultCodesYour boiler is not providing central heating even though it may still be providing hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: No CH Operation
What causes this fault?
This fault occurs when the boiler is receiving a signal to provide hot water but is failing to recognize or act on the command to heat your radiators. The most common reason is a failure in the communication between your external room thermostat and the boiler, or a mechanical failure of the internal valve that directs heat to the central heating circuit.
This fault is most frequently noticed during the first cold spell of autumn when homeowners switch their heating back on after it has been inactive all summer.
DIY fix possible
Check that your room thermostat or programmer is set higher than the current room temperatureEnsure the heating mode is active on the boiler displayCheck that the radiator valves are open and not turned to zero
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 4.11 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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