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My bosch 21E (infinity style) hot water system has an intermittant fault where the flame does not appear to be able to stay on (or properly light). Once water is started to the unit I can hear the ignitor go on and the fan start (and I think I can gear the flame light too) but then almost immediately it sounds like the flame goes out and tries to reignite. It never actually lights properly though, just continues the same ignite-fan-flame out-ignite cycle. After a while (a day or so) it seems to go away. It doesn't seem related to rain but does seem more prevalent on cold days. is there anything I can do without calling a plumber? Cheers, Pete

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Moisture is getting into circuit board, usaully this sealed in a jell which keeps the board protected from any kind off dust,moisture etc which would comprimise the thinking side off the unit. a bosch engineer should be able to do a diagnostics on site.

Posted on Sep 10, 2008

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We have had major blackouts does my bosch highflow 21e need to be reignited or automatic....how long should it be until I get hot water


you have to reignite it yourself turn dial to pilot and press down the light with either the internal igniter or a long match when lit then you turn dial to the ON position .

Apr 25, 2015 | Bosch 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

I have a bosch system 21e it is, i was told to ignite the pilot light, can you tell me how this is done?


Consult your owners manual.
http://www.bosch.com.au/content/language1/downloads/70R_UserManual1023.pdf
Heres a new one if you don't have or lost yours. You can't, you got bad advice. tankless system don't have a running pilot light. They operate by detecting water flow and then turning on. Many also state on the lighting instructions to NEVER try and manually light the pilot. Try Bosch tech support. Lowes sells Bosch heaters and they might be able to help you get the support number faster. Hope this helps but please don't go sticking a flame inside there.

May 16, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch 21e instantaneous water heater attached to a Hills evacuated tube system. On cloudy winter days when we use the washing machine on warm the heater has an intermittent fault for a couple of...


Wild guess, but washing machine use solenoid valves that turn on and off instantly, causing a great deal of hammering of the entire water system.
Regardless of whether or not this fixes your current problem, you really should install a large air canister to buffer the shock in the system. Normally I would suggest installing in the cold line just after it enters the house, but with your solar heating system, you need one after it as well, because there is quite a bit if switching going on. It is quite possible the switching is the problem and not the Bosch heater. Try bypassing the Hills system and see if that helps?

May 16, 2011 | Water Heaters

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Hi There, We are in a rental property and have a bosch 21e hot water system. We haven't been getting hot water and the gas bottles have been checked and are full. Do we have to light the pilot and are...


You may have a dirty pilot orifice. Try this. Turn off the pilot by turning the control knob to off. Remove the front panel to get access to the pilot orifice. Use a can of compressed air with attached straw (the same stuff you use to clean computer keyboards) and blow out the pilot orifice, which is inside the pilot assembly where the pilot flame burns. Blow it out from the top and from the sides through the air holes. Then relight the pilot and see if that improves the flame size and color (blue) to heat the thermocouple.
Here is a link to the manual and instructions. www.tanklesswaterheatersdirect.com/shop/tanklesswaterheaters/manuals/125B_manual.pdf

Mar 23, 2011 | Heating & Cooling

1 Answer

Piloit won't stay lit.


I would check to make sure thermocouple is in proper position in pilot flame. If so and pilot won't stay lit I would replace thermocouple. Thanks

Nov 12, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch GWH 425 HN Tankless Hot Water Heater...On 2/28/2010, it began intermittant exploding when demand for hot water occurred. Local technicians worked on the unit several times, changed and...


I have the same problem with the same model. The problem has been identified by a friend of mine, correctly, I think.
This is a very dangerous problem involving Bosch's much touted safety feature, ironically enough. IT IS THE FLAME SENSOR IN THE GAS VALVE. The flame sensor is supposed to confirm that the pilot has lighted BEFORE the main gas line sends gas to the main burners, after which the pilot shuts off. The pilot light is not coming on, the sensor that shouldn't let gas fto the main burners is failing and the main gas is flowing and ignighting from the spark that is supposed to light only the pilot in a big explosion.
This is the 2nd unit of this model that has failed. I think Bosch should do a recall

Apr 25, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

No hot water, pilot light lights but no burner ignition


Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

May 05, 2009 | Bosch & Tankless LP Hot Water Heater

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