Question about Bosch AquaStar 2400ES-NG

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BOSCH TWH-G1-25 not lighting

When i turn the water on, the heater starts clicking (assuming that is the auto ignition trying to come on??) but the burners don't light. the water pressure hasn't changed between the time when it was working and then wasn't . . .
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On my bosh250 hot water won't turn on. Shows A2 code I hit restart several times then as long as the hot water is on it will stay hot but when the water cools down the A2 code is back. Help!

Posted on Dec 18, 2011

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Model????? The 635Es, 250SX and 2400E are same. The 2400ES and 2700ES are World 2 heaters. Any error codes as I can't imagine this problem w/o codes. Flow initiated but you have spark. Is there any ignition? If so flame rod may be bad and not reporting ignition. Igniter sets on some early 2400/2700 have proved to be bad. Water pressure has zero to do with this. If you have an EC or EA code you have gas problems (meter, line size/length or gas valve). Also if 3005 or 3007 Software you can pull the last 5-10 error codes from Controller.
You need to call Bosch and get an RSA out there. This is a gas appliance that if you screw up can destroy your house. FYI any water in the gas valve condemns it. It will not dry out and work correctly. Is the fan running at ignition and/or purge? Any Controller errors require replacement. You have 2 years on parts warranty from installation date so don't screw around trying to DIY. Warranty Labor is not covered.
Flue obstruction? If you used the AQ3 installation Kit you have the wrong termination box to prevent freeze up and/or water penetration You need the Z-Vent drop nosed termination. Look for a fine tan dust in the fan intake (brown plastic) the intake throat or in passageway to the gas valve. Call Bosch unless you're a Gas Tech this is beyond you.

Posted on Mar 03, 2009

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All gas water heaters, tankless and tank-type, require cleaning burner and combustion parts.
Tankless manuals suggest once per year.
Tank-type once every 2-3 years.
Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
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Before calling service technician, open following links for Bosch Tankless resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125BOTechSupport/Troubleshoot/tabid/602/Default.aspx

The problem may be as simple as needing to catching up on pilot maintenance.
http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G1-24_Removing_cleaning_and_replacing_standing_pilot.pdf
Other problems can include low gas pressure, faulty sensor, faulty gas valve, tripped ECO/ safety circuit, safety circuit connections need cleaning.

Add a comment and say what you did to fix problem to help others with same problem.

Upvote the help.
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http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Resources at Bosch
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx
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All tankless and tank-type gas water heaters require regular cleaning and maintenance.
It is unknown if your unit needs maintenance or repair parts, but catching up on maintenance using information from manual is good place to start.
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http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G1-08_Pilot_flame_no_burner_flame_troubleshooting.pdf

This is information from Bosch regarding the identical problem. You can use this for general information, but if you can't make this type of repair, call a service company.
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