I have a Bradford White waterheater and I can lite the pilot and it will stay on until the burner lites and then goes out when the burner goes out. It won't even stay on long enough to get the water more than kind of warm. We already changed the thermacoupler. What can it be? Thanks, Cyn

Natural gas or propane ? Could be a fuel pressure issue.

It is gas.

Did you ever find a solution? I have the same problem.