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Gas work, sealed-system work and anything behind a live panel is for a licensed technician. These steps are for diagnosis and for telling your tech what you already checked.
Straight answers
Error codes — common questions
E03 is a drain fault — water was still above the empty threshold when the drain step ended. Start with the standpipe and the drain valve before you suspect the control.
F02 is a high-limit trip: the safety thermostat opened on over-temperature. It is almost always airflow — a blocked lint filter, a restricted vent run, or a blower that is not moving air.
Most codes clear on a power cycle at the breaker, but a code that returns is reporting a real fault. Clearing an F02 without fixing the airflow will send the machine straight back into over-temperature.