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Bosch gas manuals. my heater is not igniting every time we turn on the tap the error cde 11 shows on display controller the unit is bosch highflow 18e and isnow 13 years old any ideas?

Bosch hiflow 18e

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER

Q. FA - Gas leakage error, gas valve circuit not closing properly
A.

  1. Disconnect power supply cord and check wire connections on gas valve and the two connectors on the control board.
  2. Flow water out of a hot water tap above the minimum activation point of .8GPM. Measure voltage at the gas valve wire connector. The connector should measure 24VDC between the left pair of wires and 24VDC between the right pair of wires when the unit is operating. If voltage is not correct, contact Bosch Water Heating for further instruction.
  3. Gas valve may be defective, contact Bosch Water Heating for further instruction.
Q. EA - No flame ionization detected with water flow
A.
  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 required.
Q. C1 - Fan rotation too low on startup
A.
  1. Disconnect power supply cord. Check wire connections on back side of fan and the two large wire connectors on the control unit. Removal of lower access panel on control unit is necessary to access connectors.
  2. Verify that supply voltage is 120VAC and is properly grounded.
  3. Verify that venting meets specifications outlined in chapter 3.6 of the installation manual. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure. Verify backdraft flapper inside flue gas collector is not stuck shut.
  4. Check gas pressure. See Bulletin TWH-G2-03. Low gas pressure may cause the fan to change its speed to meet desired temperature.
  5. Possible defective control unit. Call Bosch Water Heating for further instructions.

Posted on Mar 15, 2009

  • 234 Answers

SOURCE: Need free Worcester Highflow 3.5 user manual

http://www.worcesterbosch.com/

Posted on Mar 19, 2009

  • 2 Answers

SOURCE: tankless water heater error code 11

I was having the same problem untill I reallized it was my venting system. Test the water heater with no vent on top. Disconnect the vent pipe from the water heater and try turning on the hot water. the water heater needs a special adapter to vent the direct vent water heater. One other thing you can check is the gas pressure in your home. You have to have between 7 and 8 WC (water Column) for the tankless water heaters. You can call your gas supplier to find out what you have.

Posted on Jul 04, 2009

snap101
  • 117 Answers

SOURCE: Heater shuts down with C4-13 code

your not getting enough fresh air to it. where is it located? you need 1 square inch per 1000 btu's. it's having irregular combusion.

Posted on Aug 02, 2009

  • 1 Answer

SOURCE: GE gas water heater lights for only a few seconds.

Called GE and there is a glass vile under the burner that is defective and cuts off the oxygen.
They are mailing out a replacement to my house & have contracted a plumber to install. waiting 4 days now. They say that the glass vile incinerates and there is not any thing left to it. The burner area is full of black soot. will post again one fixed.

Posted on Jan 21, 2010

Testimonial: "This is an accurate description of my own follow up. That device, a TRD, was the indeed the problem. "

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My Boch 24ES Highflow Hotwater is showing Code 14 and only runs for i minute then shuts off


Code 14.
What water heater do you have?
Question posted under tankless Bosch, but these error codes start with a letter.
Rheem/Richmond etc Tankless has error code 14
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
Call tankless service technician.
Ask technician how much it costs to have recommended yearly service.

Or install whole new tank-type gas water heater yourself for $350 from local box store, and avoid the entire headache, then sell tankless online for parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Aug 09, 2012 | Water Heaters

2 Answers

I have a paloma tankless water heater ptg-74pvn-2 that gives me the error code c2 11. looks like everybody has a problem with this. what can i do to fix it, surely enough they should have some easy way of...


Easy solutions for C2 11:

Rheem is one of the big manufacturers but has disproportionate number of questions at fixya since they try to funnel problems through service techs instead of posting do-it-yourself service bulletins. People want do-it-yourself service bulletins, as appear on the Bosch site for their products. Easy-fix in this sense would be to buy Bosch, and read service manuals aforehand to see if you have testing skills and equipment to maintain and repair tankless water heater.

Easy solution for C2 11 Rheem problem is don't install gas tankless water heater, since all costs are energy and tankless are expensive to install, maintain, repair, and replace for the mere savings of 1-8 per month.

Third solution for C2 11 no-ignition is to clean burner and combustion parts, and sand carbon off the igniter, on a yearly basis, as recommended in manual.

Fourth solution is to call a qualified service technician each year as recommended in manual, and have technician fix problem and catch water heater up on recommended service. This person can check other causes for C2 11 such as bad igniter, bad gas solenoid, low gas pressure, air in gas line, improper unit grounding, bad wiring, bad sensors, etc.
This check-up can also make sure vent drain is working properly and that acidic water vapor and other resulting combustion by-product are going into the household drain and eventually out to sea instead of dripping down into the heat exchanger causing rust and premature failure of exchanger.

Next solution will not solve C2 11 error code, but can address other error codes before they happen: Maintain water heater on yearly and monthly basis as recommended in manual. This is good for folks who like projects.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

More resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
1-800-432-8373
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sep 20, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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

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

Hi my Bosch 18 e highflow instantaneous hot water service, turns water cold after a minute or so then stays cold. When you turn the water off the pressure valve keeps pulsating for about 5 seconds. The...


Open following link for Bosch troubleshooting resources, including contact phone numbers and possible manuals.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If the conversion was made 3 years ago without a problem since, it might not be a factor.

May 05, 2011 | Water Heaters

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

7 Answers

BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER


the A3 & E3 codes are for the back flow sensor on the heater. Could be disconnected or a bad sensor. Call bosch tech support and they will help you with this.

Dec 30, 2008 | Bosch AquaStar 2400ES-NG

1 Answer

No hot water


diaohragm valve or micro switch

Nov 14, 2008 | Bosch & Tankless LP Hot Water Heater

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