Question about Bosch 1600H-LP Liquid Propane AquaStar AquaStar Liquid Propane Tankless Water Heater

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BOSCH 18E I HAVE A BOSCH 18E GAS HOT WATER SYSTEM WITH A YPRM 54XB WHICH IS SHOWING AN ERROR MESSAGE 11.DOES ANYONE KNOW WHAT THIS MEANS??????????

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gary1121
  • 332 Answers

SOURCE: Low Water Pressure Gas System but High Pressure when Solar Water

if you have a gate valve on the unit from the hot water tank it could be as simple as the valve on the gas system being clogged going to that bathroom,, from how it is described it sounds like that would be the problem check to make sure all valve are not stuck in the on position ans change the valve if it is frozen in place

Posted on Jun 06, 2009

gary1121
  • 332 Answers

SOURCE: bosch 16p gas, keeps going hot and cold

check the thermostat, you will probly need someone that has worked on the same kind of unit, they are not all the same {tankless} I would suggest a repairman,, there is a little bit much to explain how to do it over the internet,

Posted on Jun 23, 2009

  • 14 Answers

SOURCE: my bosch gas water heater does not give out

This sometimes happens in undersized gas delivery pipes. Does the unit have at least a 3/4" supply pipe?

Posted on Jul 08, 2009

  • 1 Answer

SOURCE: Bosch gas hot water system won't turn on

i have a bosch 16h hydroflow hot water system that will not ignite.

Posted on Dec 17, 2009

  • 574 Answers

SOURCE: Cannot get hot water

Make sure breaker is turned on. If that isn't it tell me model number and maybe I can help you more

Posted on Feb 07, 2010

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Bosch aquastar wont get hot


1) If tankless is not showing error code, the problem might be single-handled faucet cartridge:
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

2) Catch up on maintenance, such as cleaning combustion parts, have gas pressure checked, etc.

Feb 20, 2013 | Bosch AquaStar Natural Gas Tankless Water...

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Bosch YS2039R service manual


Can someone please help me fine a link to a Bosch highflow 18e hot water system manual to set the temperature or send it to my email alannoyes1@bigpond.com

Jun 03, 2012 | Bosch Water Heaters

1 Answer

No hot water at all when I turn on the hot water faucets nothing nomad I would hear the burner kick on but nothing what so ever


Before calling service tech, open following links for Bosch troubleshoot resources including phone support, error codes, possible manual.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

No error code can mean PC board failure, or plumbing problem
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Aug 13, 2011 | Bosch AquaStar 125FXKIT-LP 125FX Liquid...

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

Getting A2 code and hot water shuts off. We do a reset and hot water will run for awhile then we get A2 code and no hot water again.


Thanks for stopping by:

A2 error on your Bosch water heater means "Fault in the flue gas limiter"

This can be caused by several things:
The gasket on the flue gas collector may be dislodged/leaking.
Check/Remove/Reseat the gasket.
It will not reset until about a two hour cool down.

Also - check the overheat sensor fuse wire - it may have gotten hot and melted the jacket and/or been dis-colored.

Finally - there is a retrofit kit "repair" that can be obtained by calling them directly.

1-800-642-3111 and request the "FLUE GAS LIMITER RETROFIT", Part NO. 8-700-400-032. This should solve many error code situations and get you on your way again.


Thanks for using FixYa!!

Aug 03, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch 250sx NG I hired a plumber to install. I have 3/4 water and 3/4 gas line to unit. When turned to hot the water is cooking, turned down it is great,,, almost. My water will turn cold for...


Before calling service technician, open following link for Bosch troubleshooting steps.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If you are not getting error code, then problem could be somewhere in plumbing, as you suspect.
For example cross-over on single-handled faucet, or faulty check valve on re-circulation system, or sediment clog at elbow, or varied water-well pressure. Install in-line pressure tank.
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Be sure to read manual for yearly maintenance protocol.
Tankless must be maintained, and cannot be exposed to hardness in water greater than 11 grains, and should be de-limed each year. Expect maintenance, service, and potential repairs and parts for tankless to far exceed expected $1-8 monthly savings. All costs are energy.

All gas tankless brands can be repaired by homeowner for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Apr 22, 2011 | Bosch Water Heaters

1 Answer

Bosch 250 sx ng tankless water heater showing error code. checked fuses and they are fine. tried resetting many times still not working


BOSCH error codes:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx


Best place to start is troubleshoot section in manual. Page 24
http://www.boschhotwater.com/Portals/7/TechManuals/250SX_English.pdf

Problems range from air supply, gas supply, venting, part failure or combination of listed things.
Don't forget, tankless require yearly maintenance, outlined in manual, and cannot be exposed to more than 11 grains hardness in water, and should be de-limed each year.


All costs are energy.
I suggest reading entire manual several times, so you are pro about your tankless water heater.
Even with this knowledge, trained service technician will have to be consulted
some day, and tankless should never be installed if factory trained technician not available in area.

Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

Install tank type water heater that can be put online when Bosch is not working
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 04, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch tankless pro hot water heater cycles on and off very hot or cold not consistent what lp pressuer is need ? flame goes off while water is running


LP pressure needed is no less than 11 inches of water column while all gas appliances are in operation. Info is in the installation manual near checking CO2 levels.

Jul 19, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a 250SX aquastar Bosch tankless hot water heater . It keeps going out on EC code; whats wrong? Also I've been running the unit for about a 9 months without hooking up the condensate dain line.


The 250 MUST have the condensate line connected. EC comes from gas supply problems and CO2 levels not being adjusted. LP units require 3/4" smooth gas pipe or 1" corrugated pipe minimum size. The LP regulator needs to be turned up to about 13 inches of water column and with all the gas appliances on, measure no less than 11 inches of water column. The CO2 levels must be measured by a qualified gas technician with a calibrated (with in 6 months) CO2 analyzer.

Mar 20, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Low Water Pressure Gas System but High Pressure when Solar Water


if you have a gate valve on the unit from the hot water tank it could be as simple as the valve on the gas system being clogged going to that bathroom,, from how it is described it sounds like that would be the problem check to make sure all valve are not stuck in the on position ans change the valve if it is frozen in place

May 22, 2009 | Water Heaters

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