Question about Bosch AquaStar 125FXKIT-NG 125FX Natural Gas Tankless Water Heater w/ Hood

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Pilot light on bosch aq125b will only stay lit as long as I hold down button, turns off as soon as I let go of button.

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I was having the same problem-it was caused by a defective gas flue sensor, which is part of the thermocouple assembly. ($75.00 shipped)
I hope this helps

Posted on Sep 18, 2009

  • kotuamoalt May 11, 2016

    To verify, short the connectors on the sensor. If the pilot stays lit, that is the problem. If that does not fix the problem, it is likely to be the thermocouple itself.

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Defective thermocoupler. Inexpensive easy fix. good luck be safe

Posted on May 18, 2009

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