Question about Bosch & Tankless LP Hot Water Heater

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Error EA My outside air intake was covered with snow, now when I turn on the hot water it will try to run, but won't stay running or deliver hot water. The unit then reads an error of EA? I have tried to restart it several times. Help

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  • grand_prix_4 Dec 21, 2008

    error msg EA snow filling in vents in side of house...no pilot light won't ignite...tried unplugging melted ice..and snow..put a tent made from plywood over vents so snow won't blow in...no plumber on duty for weekend "great" no hot water to shower..and a day missed of work...what solution does anyone have since I am a women...and used logics to make a tent to cover the snow from blowing in and just tried the tankless 7 times to restart and reset and melted snow and ice ?...hmmm? anyone.

  • jbheraiya Jan 01, 2009

    i was chake in morning time for hot water it wasnt come out.i was open boiler room than it was keep fleshing of reset button and show error ea code

  • kcc773 Feb 04, 2009

    Unit is about 4 years old and is a Bosch Aquastar 2400E NG. Everyone once in awhile unit will not produce hot water and will flash EA. After turning off and on unit it will eventually start hot water again.

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Welcome to Fixya
you have a Bosch tankless water heater your heater is not pumping out hot water?
Please send model # Thankyou

Posted on Dec 16, 2008

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Reliance 606 propane pilot won't stay on when i begin to turn on.its like ite not getting the message or signal,HELP PLEASE


1) Reliance is AO Smith-American, and air intake screen located on bottom of water heater. Clean air intake. Replace thermocouple. First two digits of serial number are year of manufacture.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-to-replace-thermocouple.html

2) Add comment and say what you tried so far.
Include age of water heater.

Jan 05, 2013 | Reliance & LP Gas Water Heater Control

1 Answer

991 error code on a Takagi T-K3 Flash gas tankless water heater


Re- set code!!!!
We have a Takagi TH3 DV 540 model.Air intake got blocked with snow, condensation etc.Once we cleared that then you just have to re-set it to clear the 991. On our model there are 4 tiny buttons across the bottom (Take off front cover) to find them. of the computer board assembly bottom left corner. Push the two buttons on the right simultaneously hold for 15-20 seconds or so, then turn the Takagi off then on again- should work now!
If you have a different model then those buttons will be in the bottom left corner still but running vertically- try doing as above with the bottom two buttons. We had to go without heat and hot water for 2 days until we could get hold of someone to tell us this. We called Seneca Supply 716-852-4744. Good luck

Apr 22, 2012 | RTO Takagi T-K3 Flash Gas Tankless Water...

1 Answer

Reliance 606 natural gas water heater - model #640YORT - water does not stay hot. pilot has to be clicked to heat and then u can use hot water til tank empty and it will not continue to heat water.


If I understand correctly, the pilot light is not staying lit.
You light the pilot and water in the tank reaches temperature.
Once hot water is gone, then pilot light has to be lit again.

Gas pressure is good, and gas is flowing.
Thermostat is working at high end because it cuts off heating.
Vent is working because tank heats up.
Air intake is working.

Gas control thermostat might not be reading low temperature. Replace gas control valve.
Pilot tube might be dirty. Clean burner parts and combustion chamber, and air intake, and vent.
Backdraft might be blowing out pilot. Check for constant updraft by running water heater 5 minutes, and then light match under vent hood and see if smoke goes up.
Very hot air can put out pilot, especially when water heater located in attic. Add ventilation.
Improper vent might have water dripping back down into combustion chamber and putting out pilot light and rusting out the parts. Inspect for rusted parts and water.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf

Aug 09, 2011 | Reliance Natural Gas Water Heater Control

1 Answer

Model Aquastar 250 is not running and is showing an error code of EA. What can be the problem?


  1. Verify that all manual gas shut off valves are open.
  2. Verify gas type (See Fig. 2 in installation manual) corresponds with the type of gas supplied to the heater.
  3. Reset error code and open a water tap to cycle the heater in an effort to purge air from gas line (especially on new installations). Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater.
  4. Verify the three yellow wire connections to the set of electrodes (underside of the burner assembly) are secure.
  5. Verify gas pressure meets specifications outlined in chapter 3.8. See Bulletin TWH-G2-03.
  6. Verify venting meets specifications outlined in chapter 3.6 of the installation manual. Improper venting may cause premature failure of the flame sensor rod.
  7. Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If not, Call Bosch Water Heating with observations. Readings from above gas pressure test will be req

http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/250SXTechSupport/Troubleshoot/tabid/563/Default.aspx

Feb 03, 2011 | Bosch Water Heaters

1 Answer

250sx quit working. Gas o.k. water flow good, throws ea code after 3 start attempts. 1. where is the ionization electrode, and is the fan supposed to come on before ignition? Fan comes on afterea code....


The gas pressure must be increased at the regulator from 9 inches of water column to about 12.5-13 inches of water column. The CO2 levels need to be adjusted for each installation. The air intake MUST come from outside the same wall as the exhaust. I have never seen any manufactures tankless unit installed properly. Plumbers do not read the manual.

Jan 24, 2010 | Bosch & Tankless LP Hot Water Heater

2 Answers

I have a Bosch AquaStar 2400ES-NG, Error Code EA appears, I hear ignitor clicking, heater tries to activate 3 times then EA code reappears.


There are three electrodes (connected next to each other by a single piece of metal) that run up into the heat exchanger. They are situated behind the black plastic air intake in the lower half of the unit. Pull out the electrodes and clean them off with steel wool or fine sand paper. Also take the opportunity to blow the dust out of the inside of the unit and clean out the air intake.

Apr 20, 2009 | Bosch AquaStar 2400ES-NG

2 Answers

BOSCH TWH-G1-25 not lighting


Model????? The 635Es, 250SX and 2400E are same. The 2400ES and 2700ES are World 2 heaters. Any error codes as I can't imagine this problem w/o codes. Flow initiated but you have spark. Is there any ignition? If so flame rod may be bad and not reporting ignition. Igniter sets on some early 2400/2700 have proved to be bad. Water pressure has zero to do with this. If you have an EC or EA code you have gas problems (meter, line size/length or gas valve). Also if 3005 or 3007 Software you can pull the last 5-10 error codes from Controller.
You need to call Bosch and get an RSA out there. This is a gas appliance that if you screw up can destroy your house. FYI any water in the gas valve condemns it. It will not dry out and work correctly. Is the fan running at ignition and/or purge? Any Controller errors require replacement. You have 2 years on parts warranty from installation date so don't screw around trying to DIY. Warranty Labor is not covered.
Flue obstruction? If you used the AQ3 installation Kit you have the wrong termination box to prevent freeze up and/or water penetration You need the Z-Vent drop nosed termination. Look for a fine tan dust in the fan intake (brown plastic) the intake throat or in passageway to the gas valve. Call Bosch unless you're a Gas Tech this is beyond you.

Mar 02, 2009 | Bosch AquaStar 2400ES-NG

2 Answers

EA error msg on Bosh tankless unit


How I fixed it was got rid of it...support help never called back..and to get parts for it was looking into the new year can't go without a shower that long...can we now?

Dec 22, 2008 | Bosch & Tankless LP Hot Water Heater

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