Tom, I found one post where the the E1 error was fixed by replacing the igniter electrode.
The premise was that the system checks for the igniter electrode to be clear of spiderwebs or debris by looking for an open circuit, that is no electrical leakage to ground. (I have not been able to confirm this, but it makes sense) If the ceramic electrode insulator has a hairline crack, that expands and contracts with temperature, it can fail the test, and store the E1 code.
If there has been dust, lint, spiderweb in the area of the igniter electrode, once the flame starts, the debris will be burned. That could leave some traces of carbon, which is conductive, and could perhaps get concentrated in a hairline crack.
It might be worth removing and cleaning/checking/replacing the igniter electrode. My experience with engine spark plugs is that I could not determine by visual inspection of the ceramic insulator that it was bad.
It makes sense that the control board would check as a background task the L.P. systems even when running on shore power.
Brad
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