20 Most Recent Bosch & Tankless Water Heater Questions & Answers

Try a new sensor . I cannot see who told you to wipe the pipe it will do nothing .

if you need a service call on wrong site either your gas company or company who services your heating

http://www.ehow.com/how_7242802_troubleshoot-bosch-tankless-water-heater.html
homerepair.about.com/od/.../ss/trblsht_hwh_3.htm

www.tankless-water-heaters.com/troubleshooting-service-guide.htm -
Hi. please find above, some DIY websites, these will assist you in troubleshooting and repair.
A service manual, for your exact make and model, is required for best results.

Copy following link for EXAMPLE E3 error code troubleshoot, to gather information to 'assist tech support in determining cause and solution to problem.'http://waterheatertimer.org/pdf/Bosch_A3-E3_Error_Code_Troubleshooting.pdfContact Bosch 800-283-3787, or service technician.http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for Bosch troubleshooting resources.Bosch posts service bulletins.http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.htmlInstall tank-type gas water heater for total $350 and save the whole expensive mess of tankless.http://waterheatertimer.org/How-to-install-gas-water-heater.html If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Tankless require yearly service to keep burner and combustion parts clean and check electrical connections, gas solenoid, gas pressure, venting, etc.Read product manual for advisories and recommended maintenance.Yes, aren't you glad you saved the manual.Always check that local area has affordable and qualified service technician for your brand before buying tankless. Before calling service technician, copy following link for general troubleshoot resources, including some manuals, and links to Bosch.http://waterheatertimer.org/pdf/No-Error-Code.pdfhttp://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.htmlTry turning temperature down.The fact there is no error code, and the gas is not firing correctly, means you have a small unit with no error codes and PC board has failed ... or it means you have a unit with error codes and possibly bad PC board.If problem is the PC board, then Bosch will send you new board, and expect same level of repair success as though your computer's motherboard was replaced.You can buy ordinary box-store tank-type heater and install yourself same day for about $325.Then maintain and fix it yourself. I recommend AO Smith/American/State/Reliance/Kenmore/Whirlpool since these are easy to maintain with clear directions in manual, plus AO Smith posts service manuals for the whole line of products, and any local plumber can fix them with ez-to-locate generic parts.http://waterheatertimer.org/How-to-install-gas-water-heater.html If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Error codes F1 and F2 do not show among common error codes.
Call Bosch 1-800-642-3111

Before calling service technician, open following links for Bosch troubleshoot resources:
Error codes are considered start-point for troubleshoot.
Multiple error codes can indicate PC board failure.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/250SXOTechSupport/Troubleshoot/tabid/569/Default.aspx
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/250SXOTechSupport/ServiceBulletins/tabid/573/Default.aspx

You posted under Bosch tankless water heater.
The suspect is probably gas supply, gas valve, or gas related part inside tankless unit.

Before calling service technician, open following link for Bosch tankless troubleshooting resources, including Bosch contact information, typical manuals, error codes, tech support, parts, fuel-saver calculator, service bulletins, water heater forum, fixya links, disclaimers, and links for finding service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

Add a comment with your experience so others with same-similar problem can benefit.

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.

You can look into an electric flue damper. It must be tied into the heater controls so the fail-safe is that the heater will not operate unless it senses that the flue is open.

Hi, Please do massive / longer bleed on/off for several time and get it retry. If problem still persist, I worry you have problem on your controller and need repairing at dealer.

Regards, Jay

its the warm stabiliser is not work

That is a residential unit and at maximum will raise water temp 90 deg at 2 gallons per min.. You need at least one commercial unit with a thermostat that will allow high enough water temp. to pass health dept. requirements, and a self heating dishwasher at a minimum.