Circuit below. The timer appears to be an auto repeating with 7 sec on and maybe 60 repeat cycle, I will have a better idea when it is running.
The timer switch is inline with the relay that controls the pump and fill solenoid. The timer runs when the hot water button is pressed or the fill switch demands water, so in short it appears to be some sort of way of filling the boiler slowly, maybe to increase stability? Anyone seen this before or want to take a guess?


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