Question about Terminator Aquastar 125FX Tankless Water Heater: FX Hood Horizontal Vent

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HI, I have a Bosch tankless water heater with electronic ignition and no pilot light. The heater will work great for a week or so then it will cut off for no reason and flash P2 in the readout. If I restart the heater a few times it will reset and work for a few more days and them we do the same thing all over again. "P2" is suppose to mean the incoming water is too cold, but that hard to believe in the middle of summer. Any ideas? Thanks

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  • Tim Hamlin May 11, 2010

    P2 is a programing flash on the board. It has nothing to do with temps. If this is happening all on its own, then you have a control board problem. If this is happening when your trying to reset the heater, then the error code is different.

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Actually E2 means the water is too cold. P2 is a computer program setting.

Check the connection of the temp sensor itself, maybe its broke on the inside if a new temp sensor didnt fix the problem.

Posted on Jan 19, 2009

  • Tim Hamlin Jan 19, 2009

    Actually E2 means the water is too cold. P2 is a computer program setting.



    Check the connection of the temp sensor itself, maybe its broke on the inside if a new temp sensor didnt fix the problem.

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