Question about Bosch Water Heaters

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Ion sensor Was getting EA error messages. Checked out error to be ion sensor, got a new one.Is there an easy way to change it out?

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What is model number?

Posted on Jul 18, 2013


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Reading EA, everything checked..can't get hot water working


Type, model and brand of water heater is not identified.
Add a comment with more information for possible help.

EA troubleshoot on Bosch tankless appears on following link:
Tool needed: multimeter, and Bosch asks that you contact them with results.
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf

Sep 27, 2011 | Water Heaters

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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

Bosch GWH 715 ES flashing EA code. This unit was working fine for over a year so I am assuming gas pressure can't be the problem? The spark is flashing and the unit lights for about 2 seconds then...


http://www.digelair.net/pdfs/TECHLIT/BOSCH/MANUALS/Bosch-ProTankless_AM.pdf
http://www.bosch-climate.us/files/201009031238250.GWH715ES_English_12.2008.pdf

Above are the manuals required to diagnose and service your error code.

EA: No flame ionization detected with water flow.
Verify that all manual gas shut off valves are open. Check gas type. 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. Check three wire connections to ignition group on the lower front of the heat exchanger are secure. Check gas pressure. Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod. Check that the minimum power fan speed has been adjusted to the proper value. 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.

Jul 07, 2011 | Bosch & Tankless LP Hot Water Heater

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

2 Answers

Bosch SX 250 Lp. I get EA code and will not start. Was very windy last night. Does anyone know how to correct this issue?


EA & EC are telling you that the flame is not covering the flame sensor rod.
Take the front cover off by unscrewing the 2 phillips head screws about 1/2 way down the cover and may be covered by a plastic plate that unsnaps.
Locate the flame inspection glass window near the right side above the control panel. Prepare to observe the flame from start, until the error appears. Visually locate the flame sensor rod: there are 3 rods that pass through the plate below the burner - it is the right most of the 3, angle your head so you can focus on this single rod. Begin water flow by opening a valve or the pressure relief valve that should be outside the cabinet, at the bottom.

Did the flame ignite? it should make several tries before an error.
if it ignited, did the flame cover the flame rod, or did it jump up over it leaving the rod in clear gas below the flames?
In the LCD display, upper right corner, is an indicator in the shape of a flame. It is visably displayed when the flame is covering the flame rod, indicating that the flame is being detected by the electronics. If the flame covered the rod but the indicate is not on, the rod itself may be dirty. Remove it with the other 2 ignitor rods and careful clean the sensor rod with something like steel wool to remove the corrosion. Re-install and test again. If that didn't fix this condition, your control circuit is faulty.

If you find that the flame jumps over the rod and doesn't emerce the rod, check the draft vent pipe for any obstructions, water, bird nest, etc, and any obstruction of the combustion air supply. Check the the gas blower starts up, check for water or white dust in the clear tubing that attaches to the black blower intake from the gas meter.

Otherwise, you will need to follow the procedures to adjust the CO2 and this WILL require a combustion gas analyzer! If you are at an elevation above 2,000 feet, expect to make this adjustment.

Jun 05, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

3 Answers

-0 82 error code PTG-74PVN Rheem tankless


I had the same problem, but when you change the PCB the chip has to be reset regardles of the elevation so it can communicate properly. The rest is easy, Find the DIP Switch located on the top left side of the PCB set switch #1 & #2 to the ON position push and hold the adjustment buttom till the display changes from flashing to illuminating the reset the DIP switch #1 & #2 to the OFF position and you are ready to go.

Aug 21, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Error Code EA - not in owner's manual


Think maybe just loose connect to me.

Mar 13, 2009 | Bosch AquaStar 2400ES-NG

1 Answer

Error EA


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

Dec 15, 2008 | Bosch & Tankless LP Hot Water Heater

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