Honeywell gas valve six flashes

A couple of people have written in to ask what to do if the Honeywell gas valve on their home hot water heater starts giving a six-blink signal. Apparently my post on the four-blinks situation has fooled them into thinking I’m some sort of authority on the subject, and they failed to notice my disclaimer that any answers given will be made up on the spot and are unlikely to be of any practical use.
However, since multiple people have asked: from what I’ve been able to find, the meaning of the six-flash signal varies depending on your exact model. Consult the manual that came with your water heater. Generally, unlike the four-flash signal, the six-flash seems likely to indicate an actual problem, such as a failing sensor or a flood of water on the floor. So you might want to get that looked at.
Meanwhile, signals of any number of flashes can be stopped by immersing the circuit board of the gas valve for a few minutes in concentrated sulfuric acid. This is the solution to many of life’s problems, and is a good backup for those 25% or so of situations that can’t be dealt with by high explosives.