Question about Bosch AquaStar 2400ES-NG

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Error code e2. inlet water temp sensor. any one have to fix this?

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Before calling service technician, open following link for Bosch troubleshooting resources, including error codes, manual, Bosch contact info, and service bulletins.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are starting point for troubleshoot.
e2 is cold water temperature sensor fault.
Bosch error code says: 1) Check connector on wires coming from top of water valve for a secure connection.
2) Sensor may trip if water temperature drops below freezing to protect heater from freezing conditions Any damage due to freezing conditions is not covered under warranty.

Another contributing cause can be temperature thermostat set very high and tankless sensor is going bad, and very cold incoming water, or combination of factors above.

Also read manual for advisories and required maintenance. Some units require water filter be cleaned monthly.

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Posted on May 28, 2011

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My water heater is a "Marey" propane and the water won't get hot and it keeps saying "E2" I lost my manual so I can't see what that means. Do you know?


An E2 code is often an indicator of an electrical problem inside the water heater. The most common problem is with the inlet water temperature sensor. Often a reset will fix the problem. To achieve the reset unplug the unit. Open the unit being careful of fragile electrical wires. Next remove the computer board and then disconnect each plug in wire and reseat them one at a time. Reassemble the unit and plug it in. It should be in working condition, without the E2 code.
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and also another idea here

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E2 Google Search

Apr 26, 2017 | Water Water Heaters

1 Answer

Just installed, shows error code E2, is not heating water


An E2 code is often an indicator of an electrical problem inside the water heater. The most common problem is with the inlet water temperature sensor. Often a reset will fix the problem. To achieve the reset unplug the unit. Open the unit being careful of fragile electrical wires. Next remove the computer board and then disconnect each plug in wire and reseat them one at a time. Reassemble the unit and plug it in. It should be in working condition, without the E2 code.

May 22, 2015 | Water Water Heaters

1 Answer

Error code tankless gas


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Dec 15, 2013 | Bosch AquaStar 2400ES-NG

1 Answer

Error code e2


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Dec 15, 2013 | Bosch Water Heaters

1 Answer

Bosch GWH2400 ENG has an E2 message


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Dec 15, 2013 | Bosch AquaStar 2400ES-NG

1 Answer

Water is way too hot. Five year old GWH2400E NG is giving error code EC: Ionization failure during operation. set point temperature = 106, inlet water temp = 88, outlet water temp = 171, water flow = 12,...


Before calling service technician who has service manual and can test which part has failed, open following links for troubleshooting resources including steps below and phone number for Bosch:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ETechSupport/Troubleshooting/tabid/1131/Default.aspx

Clean inlet filter
Check all faucets for clear pathway
This unit does not work with preheated water (solar assisted)
Incoming water above 70 degrees, avoid restricted faucets
Check that both temperature sensors are making contact and firmly mounted on respective cold and hot pipes.
Descale heat exchanger
http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G2-13_Descaling.pdf

Aug 16, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Error code e2 on Rheem tankless water heater


e2 is not shown among common error codes:
Error e2 might be: Brownout condition or too low of voltage to thermostat. Double check wiring and check for 24 vac between R and C. E2 will clear 15 sec after proper voltage is restored.

Before calling service technician, open following link for Rheem troubleshoot resources including Rheem chat and typical generic manuals and common error codes:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Model number and serial number are required for Rheem contact, and then they tell you what error code means without saying how to fix it, and then tell you to call service technician.

Tankless water heater manuals each say to have qualified technician perform yearly service. Most causes for common error codes are covered by yearly service.

Yearly service is fairly standard in the HVAC and water heater industry with advancement of high-tech 'energy' saving appliances. Of course all costs are energy, and the service call probably costs more that the 'energy' saved by energy-saving appliance. But with high tech stuff like tankless, it is good to have a reliable service guy who knows your machine.
http://waterheatertimer.org/images/Tankless-wiring-1200.jpg

Jul 27, 2011 | Rheem Tankless Hot Water Heater...

3 Answers

I unfortunately own a Omega 2000 Group tankless


E2 is the overtemp code. Unfortunately, the Omega line does poorly with single-handle faucets. Don't bother George Sararu, he just bought a container of these water heaters and knows nothing about plumbing. There will be no repair parts you will need. Either toss it now and get a tankless from a local dealer, or wait until your Omega unit is totally useless, then go with a local guy. George conned a lot of people - including me. I own 2 side-by-side in the utility room and figure one more year until they are junk.
Since I'm on a well, they have to be seasonally adjusted to compensate for groundwater temps. Big pain, should have bought Rinnai.

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Omega tankless water heater giving error code E2 incomplete burn


it sounds like your flu pipe may be clogged,, they just snap together or have little screws holding them together,, take the sections apart and make sure nothing is is the line reinstall and try it out

Jul 06, 2009 | Omega Reliance& Electric Compact Water...

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