Question about Bosch & Tankless LP Hot Water Heater

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Pilot OK main burner does not flare when hot tap turned on

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If you are not getting error code, then problem could be plumbing.
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Many internal and external factors can also cause tankless problems without error code.
Circuit board failure, sensor failure, incoming air, venting, gas flow, water pressure, water flow, or combination of factors.

Open following link for Bosch troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Add a comment with your experience to help others with same-similar problem.

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.

Posted on Mar 25, 2011

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I have a bosch aquasar 125b tankless water heater and the burners do not light when hot water is turned on this also causes the pilot light to go out


possible faulty pressure switch connected to the water line and that is failing to turn on the main gas tap solenoid
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What are you expecting to happen?

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The pilot is ok.the main burner does not come on


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