Question about Bosch Therm 830 ES NG Internal Tankless Water Heater - Natural Gas

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My bocsh 830es water heater will be running normal then will kick into a A3 mode no more hot water

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Check for a green wire near the top right of your machine. It would loop back to itself with a little black heat shrink on it. This should be far away from the heat exchanger. if its near it, I would recommend pulling it out of the wire clips, and relocating it to behind the control unit on the right side of the machine. Keep it away from heat....its a resistor, and will pop random A3 codes if the heat increases its resistance. Reset your code and you'll be good to go.

Posted on May 06, 2014

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Posted on Jan 02, 2017

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SOURCE: my hot water heater makes garbling noise while

If you have hard water the unit may need to be drained and cleaned due to build up inside the tank

Posted on Oct 10, 2009

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