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Do you adjust the water temp with 2 arrows (not a dial) on the gas valve? If so what other LED's are lit besides vacation?
I need you to be more specific. Left to right which LED's are lit. This is an error message and will/should point to the problem
Ok, I'll assume you mean vacation and the A&B lights. This is a generic failed ignition error. If the gas was off for a month there could be air in the line and cycling the power off waiting a minute then back on will reboot the heater. If there's air in the line doing this several time should solve the problem. Beyond that you need to be there to trouble shoot this further.
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