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A1 alone does not identify a faulty part. The heater model and when the message appears determine what to do.
The model and the sequence of events matter more than a generic explanation of the warning.
An ignition lockout does not identify a faulty part. Understand which checks are safe and which need a technician.
It is not always a gas supply problem: the exact model and full code determine what the warning means.
The exact model and display sequence help assess the message without mistaking it for a low-pressure fault.
F13 does not mean the same thing on every model. Identify your boiler before attempting a reset or buying a sensor.
A6 alone cannot identify a faulty part. Confirm the boiler model before resetting it or paying for a replacement.
Pressure helps narrow down the fault, but it is not the whole story. These signs help you decide without opening the boiler.
The model determines what this fault means. Separate safe external checks from work that needs a qualified engineer.
A circulation fault does not necessarily mean a failed pump. Understand the possible causes and safe external checks.
What a thermal lockout means, why a reset may not solve it and which external checks are safe.
E1 and E15 are not interchangeable. Identifying the model helps prevent needless resets and incorrect replacement parts.