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Find clear guides to boiler error codes, common faults and everyday problems, with simple steps to pinpoint the cause and fix it faster. Save time with practical help that explains what each warning means and how to act without guesswork. Ideal when you need a quick, easy solution and want to get your boiler working again.
The boiler is reporting a fault with the SU board, so it is worth checking compatibility, connections and the main control board.
The boiler indicates insufficient pressure: the cause, the critical threshold, and how to safely restore the circuit.
The warning indicates an internal communication fault. These are the most likely causes, the symptoms, and the appropriate response.
The warning indicates an open input on the control board. Check the essentials and avoid actions that could worsen the fault.
The B09 fault usually points to a live-neutral reversal or the control board. Key points to understand it and know when to stop.
The fault points to an open RL input on the PCU and usually requires a professional check of the electronic control system.
The alert points to a circulation problem in the circuit. Pressure, the pump and valves are the key factors.
The boiler shuts down due to overheating when the water isn’t circulating as it should. These are the most likely causes.
The boiler goes into protection mode due to excessive temperature: real causes, safe checks and when to call a technician.
The boiler is alerting to a mismatch on the PSU board and requires a technical diagnosis before you continue using it.
The lockout usually comes from the BCC valve or an incomplete internal charge, not from the pressure or gas.
The lockout usually points to the BCC Service key or a failed internal load, with technical assistance needed if it persists.