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 Jacuzzi tankless water heater error 12
Author: jimbirk0 (AL)

My jacuzzi tankless water heater is an outdoor model mounted on the side of my house. I do not have the exact model code with me, but I get an error code 12 only when the outside temperature is below 20 degrees (which is not that often). The unit tries to come on twice, then faults out. I suspected the voltage had dropped because the pipe wrap heater is on the same circuit, but when I checked another outlet on the same circuit, I measured 122.3 volts AC. The DIP switches are set correctly (#2 & 3 off for 0-2000ft altitude). Any suggestions?

Did it again this morning _ outside temp is 18 degrees. I will wait an hour (fortunately it's Sunday) and it will probably work. But driving me crazy!



Edited 1 times.

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 Re: Jacuzzi tankless water heater error 12
Author: Paul48 (CT)

Propane? NG?

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 Re: Jacuzzi tankless water heater error 12
Author: North Carolina Plumber (NC)

Code 12 is Flame Failure, I read something about a condensation collar or lack thereof causing a code 12.

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 Re: Jacuzzi tankless water heater error 12
Author: jimbirk0 (AL)

Natural Gas, 1-1/4" Line and meter, approximately 10' away, only thing on it currently.

Also this is an outside unit so no flue to worry about.



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