Reflow oven exhaust down

Your oven no doubt compensated by reducing energy to your heaters so it might not be as bad as you think. I'd be more concerned about even heating than over heating. My opinion is that an out of calibration profiler result is better than no result at all. I'd run it, note that it's out of cal., and deal with the consequences later (if it's not at the cal. lab, that is). You need to know what the temperatures are in that oven when the blower's not running to know if your product is suspect or not. Then it's up to your procedures and quality standards to determine what you do with the product.

You should run a profile on the other oven as well, under the same circumstances.

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Well the profiler IS out for calibration so I can't use it.

However, what piqued my curiosity is your statement concerning uneven heating. On the product we were running we had several non-liquidous solderjoints where as the rest of the joints looked ideal.

It would seem you are spot-on about the un-even temperature.

Hope that profiler gets here today.

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Without forced exhaust your oven will struggle to regulate zone temps, especially if a cooler one next to a hotter one. There should be no damage to the oven, just working harder to regulate itself.

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