Your boiler has entered a temporary pause state, often because it is waiting for a command from your heating controls or has been blocked by an external factor.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Shut-off mode
DIY fix possible
Check that your room thermostat or programmer is turned up and calling for heatEnsure your heating timer schedule is currently set to an 'on' periodTurn the boiler off at the fused spur for 30 seconds and switch it back on to reset the system
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like bXX — no call-out fees, no surprises.
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Remeha Quinta 30 is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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