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Find out what water heater error codes mean and what may be causing the fault. Follow practical checks and troubleshooting advice to restore hot water safely.
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.