The problem is excessive down draft or condensation. Air flow is important in combustion appliances. Too much airflow down the chimney can blow the pilot out. This is readily apparent when it gets cold and there is air rushing down the chimney in the winter. There may be an air leak in the room with the water heater. While there should be a combustion air supply that is sufficient, there should not be a place for the air coming down the cold chimney to go. That would eliminate the draft. Another thing is if a furnace is in the same room and does not have enough air to supply the burners. IF it is an older furnace without a combustion exhaust fan or has its own flue, the air being drawn into the furnace burners may be blowing the pilot out. Last but not least is the condensation issue. When cold water enters the tank it can cause water to condensate on the outside and drip down into the burner and put the pilot out.
SOURCE: Bosch AQ125BNG gas water heater
First thing I would do is clean and rebuild the watervalve. The watervalve on this heater mandates everything. This watervalve has a maintenance schedule in the manual. She be rebuilt every 3 years. Also sounds like the diaphram in the watervalve may be damaged.
SOURCE: Keep getting error codes and have to reset too often
This paticular problem your having is specific to the jumper in the heater. The jumper is for condensing heaters. Your heater does not have the specific wiring or computer for condensing. So they added a jumper in the wiring. It is failed or failing. It should ohm out at about 120ohms. sometimes its just a loose connection. Check this out, and called 1-800-642-3111, they have been very busy, but leave them a message and they will call you back.
SOURCE: BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER
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FA - Gas leakage error, gas valve circuit not closing properly
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EA - No flame ionization detected with water flow
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C1 - Fan rotation too low on startup
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SOURCE: hot water problem
Someone has not sized the system correctly. The water heater will heat a certain GPM a certain temperature rise. Most of those "generalizations" from the manufacturers are referencing the lowest of all the flow requirements like 2 lavatories. The truth is, don't use other fixtures while showering or get a bigger system. Lots of information related to sizing the tankless system at http://www.mechanicalengineeronline.com/Mini_Sites/Tankless_Water_Heaters_Ebook/Tankless_Water_Heaters.htm Have a good one. PS:Properly sized On-Demand water heaters are actually really good. Be prepared for the day your water heater quits.
SOURCE: Bosch AquaStar 125b ng suddenly goes cold during shower
Does it happen to any other fixture? If not, it's most likely your shower valve and not heater.
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