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2400es blowes out flame error code ec - Heating & Cooling

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  • Anonymous Apr 17, 2009

    Inducer motor comes on,

    Flame ignites,

    heater heats up for close to a minute,

    blower motor comes,

    flame blows out,

    Repeat until error code 21 (gas valve lockout), and no start up!

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It turns out the company's propane tank was not purged properly.......Problem solved!

Posted on May 29, 2008

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There is a
part caled hot surface ignition its a coil that glows dark red in order to ligth the furnace if its craked it wont work if its not craked it plugs rigth on to the computer board on the unit try umpluging it and take a ac metter test the to prongs you should have 24 voltscoming from there when you call for heat if there is voltage there then you could be sure that the hot suface ignitor is faulty

Posted on May 28, 2008

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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

It often flashes ea or af and doesnt want to light


Before calling service technician, open following links for troubleshoot resources including common error codes, Bosch contact information, link to service manuals, and possible product manual
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Call Bosch 800-642-3111
Multiple error codes can mean PC board failure.
AF might be A9, but not sure.
EA is 'no flame ionization detected with water flow'
  1. Verify that all manual gas shut off valves are open.
  2. Check gas type.
  3. Reset error code and open a water tap to cycle the heater in an effort to purge air 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. Check three wire connections to ignition group on the lower front of the heat exchanger are secure.
  5. Check gas pressure.
  6. Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod.
  7. Check that the minimum power fan speed has been adjusted to the proper value.
  8. 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 flame is unstable or yellow with proper gas pressure.

Aug 11, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

I have a bosch aqvastar 250 sx ng error code EC keeps appearing


Q. EC - Ionization failure during operation
A.
  1. Verify gas type (See Fig. 2 in installation manual) corresponds with the type of gas supplied to the heater.
  2. Verify the three yellow wire connections to the set of electrodes (underside of the burner assembly) are secure.
  3. Verify that venting meets specifications per chapter 3.6 of the installation manual. Improper venting may cause premature failure of the flame sensor rod.
  4. Check gas pressure. See Bulletin TWH-G2-03.
  5. Check and adjust CO2 readings. See Bulletin TWH-G2-12.
  6. Gas valve or flame sensor may be damaged. Call Bosch Water Heating with observations and results of previous steps.

Mar 06, 2011 | Bosch & Tankless LP Hot Water Heater

2 Answers

Our Bosch 2400E NG tankless water heater is displaying the EC code. I've checked the ionization electrode (rubbed it with a pencil eraser as instructed once before when we had this problem) and I also made...


Had same problem on my five year old water heater (ec error). Didn't figure it was a gas supply problem after five years but double checked to see if the gas bill was paid. It was.

Cleaned the contacts on the two sensors that are clamped to copper pipes inside. Still had error after powering up. Held the error button in for about five seconds, and the blinking EC code went away.

May 21, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

Bosch on demand tankless water heater gwh 2400 E LP error code "


BOSH AQ 250 On demand propane water heater ran out of propane, got gas now, but get EC flashing on the display and the unit won't fire? Lost manual, any suggestions. Thanks, Jim

Jan 06, 2010 | Bosch AquaStar 2400ES-NG

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

1 Answer

Error Code EA - not in owner's manual


Think maybe just loose connect to me.

Mar 13, 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

Bosch aquastar 125b ng


Replace the thermocouple.

Thats the flame sensor.

If the gas valve is not sensing flame it will not stay lit.

T-couple's are about 9 bucks.

Nov 06, 2008 | Bosch AquaStar 2400ES-NG

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