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OUr Rinnai gas heater convector 516tr keeps on turning itself off and flashes 12 on the light panel. What does that mean and how to fix it? tks

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Hi.

12 flashes means "Incomplete combustion". The code is prompted when the flame turns off because of a problem.

Check filter, check gas pressure and thermocoupling. Those are the problem that commonly trigger the code 12 error.

Here a manual.

Here Fixya thread on the problem.

Posted on Sep 06, 2010

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