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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 locks out due to insufficient gas pressure. Key points to identify the cause and act safely.
The boiler may become misconfigured after work on the circuit board. This is how the warning is identified and corrected.
The alarm indicates the domestic hot water accumulator probe and may shut off service for safety.
The alarm indicates a problem in the outlet probe of the plate heat exchanger and usually requires technical inspection.
The alert usually points to a faulty probe or a faulty contact. This is how it is interpreted and handled safely.
The notice blocks the ACS and points to a fault in the TAS system; these are the useful checks and when to call the technician.
The D99 code points to a conflict between control boards and requires specialized technical review.
An electronic fault can block the boiler and affect the unit’s startup, regulation, and safety.
The boiler detects an abnormal thermal output: real causes, safe checks, and when a technician is needed.
The notice indicates the return probe. This is how it is interpreted, what to check, and when to intervene judiciously.
The L17 lockout usually indicates a fault in the gas supply or in the control board, and the boiler shuts down for safety.
The boiler is protected by repeated detection of unstable flame. These are the correct reading and the prudent response.