Question about Bosch & Tankless LP Hot Water Heater

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Our tankless water heat will not heat the water-it won't ignite

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Question posted under Boasch tankless. Model number not known.
Before calling service technician, open following link for Bosch troubleshooting resources, including phone and contact for Bosch, error codes, and possible manual, plus hours of reading and research:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

As you know from reading manual, tankless water heaters require yearly maintenance by trained service technician, or by homeowner. This action would check gas and pressure, venting draft, condensation drain, burner and combustion parts, igniter and-or pilot light, electrical connections, air intake and general condition of plumbing.
Problem you describe does not include error code.
Open following link for possible help with general plumbing problem:
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Add a comment with model number that appears on side of unit, and I can directly locate possible service bulletins and further troubleshoot resources available at Bosch for possible do-it-yourself diagnosis and repair.

Posted on Sep 03, 2011

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I have a paloma ph6dp water heater that hasn't


You have an old tankless computer and it won't work?
What would you do if you had old laptop computer that didn't work?

Copy following links for possible resources including required yearly maintenance so tankless computers can last 4-6 years before needing replacement:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

http://waterheatertimer.org/How-to-install-gas-water-heater.html

Gene
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Bosch Confort S 13 BP tankless water heater won't ignite, It clicks but no gas going thru valve


The S 13 BP is a simple unit that does not have a pilot light. It uses electronic ignition on demand, which is what you hear clicking. If there is no gas going through and you've verified there is gas to the inlet, then it has to be the gas control valve.

Feb 01, 2013 | Bosch & Tankless LP Hot Water Heater

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My Bosch aqua star water heater lights but won't heat my water


Unplug micro switch located on bottom of water heater if it has one

Dec 30, 2012 | Bosch AquaStar Indoor Natural Gas Tankless...

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Won't heat water


Glad it worked out so easily.
Be sure to perform the regular maintenance as shown in manual to prevent common error codes.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sep 25, 2012 | Bosch ProTankless GWH C 800 ES LP Tankless...

1 Answer

Error c4-15 what does that mean


Before calling service technician, copy following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C4 can range from failed PC Board to lime build-up inside heat exchanger
Error 15 is 'heat exchanger is too hot', clogged heat exchanger, restriction in cold water inlet, temperature set point too high.
If you recently changed temperature setting, then that might be cause.
Tankless require monthy-to-yearly maintenance to avoid common error codes.
Delime tankless and clean water filter, keep temperature low.
Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Aug 26, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

Why won't the hot water stay on when the cold water is turned on?


More information is needed.
Water heater type and model is not know. Add a comment with more information.

If you have tankless water heater, the temperature could be set too high.
Other causes can include dirty combustion parts, water filter needs cleaning, heat exchanger needs to be de-limed, loose wiring, bad pressure sensor, bad PC board etc.
Instruction manual says to have professional service once per year.
Resources:
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Other cause can be crossover.
http://waterheatertimer.org/Crossover.html

Sep 21, 2011 | Rheem Water Heaters

1 Answer

Code 11 all the time have had it cleaned still getting code it is on propane had propane tank checked pressure ok


Before calling service technician, open following links for troubleshooting resources including Rheem phone, chat, error codes, general maintenance pdf, and generic service manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
http://waterheatertimer.org/pdf/Tankless-service-manual.pdf

Error codes are considered start point for troubleshooting.
Error 11 is 'no ignition' or 'no gas'
You have checked gas and pressure, and had parts cleaned.
Other causes can include: igniter wiring, bad igniter, loose wire on gas solenoid, bad solenoid, improper grounding.

Aug 12, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

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Rheem-Tankless-water-heater I am showing a C2 then 11 flashing on my thermostate. what is wrong.


Before calling service technician, open following links for common error codes, Rheem chat, and possible manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Error codes are start point for troubleshoot.
C2 11 is 'no ignition' or 'gas shut off vale is not open'
Gas shut off valve handle must sit parallel with gas line.
This kind of error code can be air in gas line, improper grounding at electrical outlet, bad igniter, shorted solenoid, loose connections, etc.
Most tankless manuals recommend yearly service, and that type of work usually covers cause for most common error codes: for example checking gas pressure, gas line, air in gas line, clean and check burner and combustion parts and igniter, inspect that vent condensate is properly draining and vent has good draft, clean water filter, clean air intake, check for loose wires, delime heat exchanger, test outlet with circuit analyzer etc.

Aug 11, 2011 | Water Heaters

2 Answers

Our Richmond Tankless is showing a reading of a C2 error code. How do we fix this. Why is it doing this?


Before calling service technician, open following link for Richmond/Rheem troubleshoot resources including Rheem chat.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start place for troubleshooting.
C2 11 is 'No ignition' or 'Gas is inadequate' or 'Ignition failure'
Error C implies ignition rod
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf

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