Question about Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater...

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I continue to get an E4 message on my Bosch Aquastar 2400 NG

I can press the reset button--the unit then resets to my original temperature setting, but then shortly stops heating and begins to flash the E4 message...any ideas what might be causing this? Is it a venting issue maybe??

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  • Anonymous Mar 16, 2014

    Everything works fine except every few days the unit doesn't heat and flashes 'ER'. Pressing the little round reset button sets it right, but how do we stop this from always happening?

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Look at the manual to see what code E4 is

Posted on Mar 15, 2009

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