Question about Bosch AquaStar 2400ES-NG
A lot of factors, internal and external, can cause this problem ranging from bad PC board to plumbing problem.
Since you have no error code, it could be plumbing,
Open following link for useful Bosch troubleshooting information including Bosch support and typical manual for 2700 gas tankless:
For folks with Rheem tankless:
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Posted on Mar 26, 2011
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Posted on Jan 02, 2017
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The gas flame igniter is not working properly.
Go to the link below and type in your model or select it and the instructions take you through the gas pressures and so on.
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