Question about Bosch & Tankless LP Hot Water Heater

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Bosch 10P Tankless Hot water system. Pilot light will go out intermittently for no apparent reason and will mostly not stay lit when you release the pilot button (about half way up) to allow switchover to main operating button (to enable burners to ignite). I would appreciate some help as this is becoming a problem. Thanks Greg

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  • mainplas Sep 27, 2010

    Could you please explain where the thermocouple is in relation to the pilot light. I found by dialing back the temperature control (rotary switch) to it's coolest setting the pilot light stays lit when I release the button and I can then turn the temperature control knob back up to normal operating temp. Is this symptomatic of the issue you described. Thanks Greg

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Hello Greg,

Your issue is most likely the thermocouple, or might be the gas control valve.

The thermocouple is the small cylinder that is placed in the flame of the pilot, and has a thin "pipe" that leads back to the the gas control valve. It works by creating a tiny voltage, that when applied to the gas control valve, creates a magnetic field, that actuates a coil, which moves a lever, that keeps open the control that allows gas to flow to the pilot burner. These are relatively cheap, but may tend to be difficult to replace depending on how the "pipe" is routed. Also, if the thermocouple is not inside the flame properly, it won't be able to generate the voltage needed. You can also test the thermocouple if you have a digital multimeter that can read millivolts (yes, millivolts, as in 1/1000 of a volt). Unscrew the thermocouple from the gas valve, carefully, and pull it straight out. You don't want to rake it against the threads. You should see 2 contacts, a dot in the middle, surrounded by a ring. Measure the voltage by putting the multimeter test probes onto each of the 2 contacts. You should see at least 25 millivolts or so. Much less, and you should replace the thermocouple. If you are seeing adequate voltage, then time to check the gas valve.

The gas valve is just a pairing of an electric solenoid that controls the pilot flame, as well as a thermal solenoid that controls the main burner. Check the contacts for the thermocouple. Make sure that they are clean inside the gas valve. If they appear clean, replace the thermocouple anyways. There may be a film on the contacts. If the pilot continues to have issues, then replace the gas valve - which will cost several times more than just a thermocouple.

Since a thermocouple replacement is recommended when changing the gas valve assembly, you are not really out any money by changing the thermocouple for testing. If changing it works, then you save the cost of the gas valve assy. If it doesn't work, then the gas valve needed replacement as well, in addition to the thermocouple.

Posted on Sep 27, 2010

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Hi Greg. The problem is either a dirty thermocouple or a worn out thermocouple. You can try cleaning it with a small brush and a vacuum or you could try pushing it a little closer to the burner. that said, thermocouples do have a life span, you can go to a local hardware store and buy a universal thermocouple for less than 10 dollars.

Posted on Sep 27, 2010

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1 Answer

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.
And 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.
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May 21, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch Water Wizard 10P - have no hot water, no water comes out the hot water tap, can't light Pilot Light, not sure where to start would love a step by step diagram how to start pilot light -...


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

Before calling service technician, read manual for fault finding and possible solutions.
Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.
http://waterheatertimer.org/pdf/Bosch_water-wizard.pdf
http://waterheatertimer.org/pdf/Bosch_13P_16P_In.pdf

Following links talk about keeping pilot lit, and describe location somewhat. Bosch water wizard has standing pilot light.
http://www.fixya.com/support/t2961646-water_wizard_10p_pilot_light_keeps_going
http://www.fixya.com/support/t2960079-bosh_water_wizard_10p_pilot_light_keeps
http://www.fixya.com/support/t6182021-bosch_10p_tankless_hot_water

1) The manual does not show diagrams you asked for.

2) Website that sells Bosch parts does not show parts for water wizard, nor does Bosch site for parts: Instruction manual says: replace pilot injector
http://www.boschhotwater.com/HelpfulResources/PurchaseParts/tabid/837/Default.aspx
http://www.houseneeds.com/shop/heatingproducts/waterheating/parts/bosch2400espartsbuy.asp#

3) Searching "pilot injector for Bosch Water wizard" turns up fixya questions which is generally bad news for do-it-yourselfer because it means information sources are through service technician.

4) As a general rule, tankless are not do-it-yourself repairs or installation because they are affected by so many internal and external factors, including air quality, air flow, venting, other gas appliances, gas pressure, gas supply, water pressure, water flow, plumbing problems, water quality, plus internal parts and including any combination of things listed above..
Replacement parts each come will disclaimer.

Add a comment with your experience so others with same-similar problem can benefit.
Send some photos so the internet can see the problem.
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

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.

Apr 03, 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

1 Answer

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.

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.

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

1 Answer

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

1 Answer

Water wizard 10P pilot light keeps going out


If the thermocoupler is defective the gas to everything is shut off. The coupler is the bulb that sits ib the pilot flame If it doesn't heat up it will sense no pilot and shut the gas off. They don't cost much and are easy to change. Good Luck, Ned

Sep 17, 2009 | Bosch & Tankless LP Hot Water Heater

2 Answers

My bosh water wizard 10P pilot light keeps going out.


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1 Answer

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2 Answers

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