Question about Bosch AquaStar 2400ES-NG

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Bosch aquastar 125b ng

Flame keeps going out, will relit but when release button flame goes back out

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Replace the thermocouple.

Thats the flame sensor.

If the gas valve is not sensing flame it will not stay lit.

T-couple's are about 9 bucks.

Posted on Dec 06, 2008

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Yes could be a bad thermocouple, but also on that unit,, a bad ECO or a loose connection, or a loose connection at the electromagnet.

Posted on Jan 19, 2009

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My pieps froze and now my tankless water tank leaks how do i get a new part



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Bosch Aquastar 125B Repair Parts Selection Grid

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http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G1-25_Water_valve_rebuild_B.pdf

The bulletin said the following:
If the burners fail to go off immediately when the
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