Question about Bosch 2400ES LP AquaStar 6.4 GPM Indoor Tankless Liquid Propane Water Heate

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Bosch tankless water heater lp gas pilot won't stay lit when button is released

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Hi. I recommend that you move the thermocouple further into the flame and see if that solves your problem. If it does, fine. If not, replace the thermocouple. J.

Posted on Jul 05, 2010

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Pilot light wont stay lit once button is released unit is about 11 years old


call your plumber and have it serviced possibly just needs the thermocouple replaced .

Dec 28, 2015 | Bosch & Tankless LP Hot Water Heater

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I have a Bosch 10P water heater. Pilot light has blown out and while trying to relight the pilot the stop button has been pushed down and won't pop back out. What am i doing wrong? Cheers


What leads you to suspect that pilot blew out instead of another problem?
Fact that pilot will not relight, indicates other factors at play.

Open following link for Bosch troubleshooting resources including manual, and Bosch contact info:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Best place to start is your manual.
http://waterheatertimer.org/pdf/Bosch_10P-installation.pdf

1) Manual recommends 'cleaning by authorized person, never less than once a year.'
Tankless water heaters, and most newer tank-type gas water heaters, are highly technical and finicky devices that require continual maintenance, with tankless requiring 'yearly' maintenance while tank-type require 'periodic' maintenance.
2) Troubleshoot in manual says 'no gas supply' or 'blocked pilot' replace pilot injector

Upvote the help.
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May 21, 2011 | Bosch & Tankless LP Hot Water Heater

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5yr. old aquastar 125x lp wont stay lit after about 5min. use. just started happening out of the blue... a clicking noise preceeds the flame shutting off. any ideas?


The gas valve makes a single click sound when the pilostat shuts off. That is a safety holding coil for units with standing pilot lights and closes if it thinks the pilot went out. In electronic ignition, the same holds true except the sensor is electronic.

Mar 31, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch 10p, the pilot light went out, when reigniting i pressed the shut off button, now it is locked in and i cant release it, is there a reset button somewhere? regards


Bosch Phone Support:
Gas Products Technical Support: 800-642-3111
Electric Product Technical Support: 866-330-2729

For Bosch tankless troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
For Rheem tankless resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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.

Mar 28, 2011 | Bosch & Tankless LP Hot Water Heater

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Pilot will not stay lit..its random..stays on for days or just a few hrs


Open following link for Bosch tankless troubleshooting resources, including Bosch contact number and link for finding service technician, etc.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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

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Feb 23, 2011 | Bosch & Tankless LP Hot Water Heater

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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

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Bosch Aquastar tankless water heater model 1600P Pilot is lit but main burner will not lite. replace water valve that controls ignition.


There should be a thermocoupler, it is that bulb that sits in the pilot flame. If it is not functioning properly the main gas valve will not open.. Hmmm, Is the main valve in the on position?

Oct 10, 2009 | Bosch AquaStar 1600P-LP 1600P Liquid...

1 Answer

I don't know how to restart my old bosch water wizard 10p, pilot light has gone out.


get a long stick match, a flashlight remove lower inspection cover, find thermocouple and pilot light will be next to it,turn gas valve to pilot light and hold down,stick the match in by thermocouple till the pilot lights and hold valve down till pilot stays lit,this may take a minute or more,then release gas valve and see if pilot stays lit, if not retry,if it wont stay lit,the thermocouple is defective and needs replacement

Jul 12, 2009 | Bosch & Tankless LP Hot Water Heater

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