Bosch 125B-NG

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Tom Wurtenberger

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I have a Bosch tankless whose water temperature will spike around 135°-145° then will cool down quickly to about 115° and stay there until you close the hot tap and then reopen it.
I see that it has 2 overheat sensors, one in the pilot light systems another in the the hot water output. I take it that this second sensor is what is cooling the water down after it sees high temperatures. But what is causing it to overheat in the first place.
Hey, wait a minute.

This is awkward, but...

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