Question about Bosch & Tankless LP Hot Water Heater

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No hot water

Flashing A3 and no hot water

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Copy following link for general troubleshoot resource:
http://waterheatertimer.org/pdf/Bosch_A3-E3_Error_Code_Troubleshooting.pdf

Posted on Dec 01, 2012

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


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.

Jan 01, 2014 | Bosch Therm 830 ES NG Internal Tankless...

1 Answer

My bosch tankless water heater is flashing ae


Before calling service technician, open following links for Bosch error codes, and contact information, and possible product manual for your model, etc:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/pdf/Bosch-GWH2400ES-error-codes.pdf
http://waterheatertimer.org/pdf/Bosch_A4-E4_error_code_troubleshooting.pdf

Error code AE is not shown, but error EA means "burner flame not recognized by control unit when water is flowing"

There is also error A3 and A3 E3: jumper connection is not correct

Sep 26, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

My tank is flashing ae on it


Before calling service technician, open following links for Bosch error codes, and contact information, and possible product manual for your model, etc:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/pdf/Bosch-GWH2400ES-error-codes.pdf
http://waterheatertimer.org/pdf/Bosch_A4-E4_error_code_troubleshooting.pdf

Error code AE is not shown, but error EA means "burner flame not recognized by control unit when water is flowing"

There is also error A3 and A3 E3: jumper connection is not correct

Sep 26, 2011 | Bosch Water Heaters

2 Answers

Why does my Ferroli HE31C keep switching off code A3.


Here you go, page 30, sounds like it's overheating, possibly a problem with the boiler stat or lack of circulation in the system. http://www.ferroli.co.uk/Product_Documentation/Domestic/Optimax_HE_31_C_Manual.pdf

Apr 06, 2010 | Water Heaters

2 Answers

Ferroli boiler error code A3


boilers need a certain amount of water pressure to operate as specified--there may be a pressure regulator valve, allowing a certain amount of water to your boiler, and when water is drawn elsewhere, there may not be enough getting to the boiler---this is one possible solution, but there are easily 20 more, and that is where a trusted plumber is worth it's gold...very difficult to diagnose most plumbing problems without being onsite

Mar 03, 2010 | Water Heaters

1 Answer

Sometimes the hot water just goes cold


Here are a couple things to look for:

1) flashing burner light - a flashing burner light indicates the unit is getting an error code
common error codes:
A. continuous flashing - ignition failure or abnormal combustion; look for visible water in the machine indicating a leak, check gas pressure, debris or buildup on flame rod/igniter plug, or clean unit with compressed air
B. 3 flashes - error 16, abnormal outlet water temperature; typically this code indicates you'll need to descale you unit
C. 4 or 5 flashes - exotic error codes; you should contact Noritz technical support to deal with these codes

2. If there is no flashing code, try increasing the hot water flow. In the summer time you typically use less hot water; this can result in intermittent operation of your tankless heater. Increase water flow by either: A. cleaning your showerhead and removing scale deposits B. widening your flow restrictor C. Remove your flow restrictor in the showerhead

3.If none of these resolves your problem, you probably have debris in your flow sensor. Contact Noritz technical support for a walkthrough on removing debris from a flow sensor.

Feb 18, 2010 | Noritz 6.3 Gallon Residential Tankless...

4 Answers

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.

Dec 24, 2008 | Bosch PowerStar AE125 AE125 Whole House...

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