BoilerFaultCodesYour boiler has detected that the circulating water is moving too slowly or there is an air pocket trapped within the system pipes.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Clas HE evoClas he evo systemE-combi evoE-system evo
What causes this fault?
This fault occurs when the boiler's internal sensors detect that water isn't moving through the unit quickly enough to safely carry away heat. The most common reasons are a buildup of sludge blocking the pipes, an air bubble trapped in the pump, or the pump itself failing to spin correctly.
This issue often appears in autumn when the heating is turned on for the first time after summer, as internal pump components can seize or air pockets can settle during months of inactivity.
DIY fix possible
Check that your radiator valves and isolation valves are fully openBleed your radiators to remove any trapped airRestart the boiler using the Reset button
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 207 — 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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