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When beans lock after 160°C/320°F this is known as late bean lock. The roaster is will normally detect late bean lock as thermal runaway, and stop the roast with the message: “Thermal runaway, press ⏵ to cool”.
Wild upward fluctuations in the temperature line will be apparent in the roast log prior to the roaster terminating the roast.
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In rare cases thermal runaway will occur when bean lock has given rise to combustion of the bean mass in the roaster. In this case there will be billows of black smoke and, very rarely, flames. If this occurs do not initiate cooling, but immediately turn the roaster off at the wall, unplug it, and if safe to do so, take it outside or use your kitchen fire extinguisher. This is a rare situation, but as with any food cooking, combustion of the food is always a possibility. If this does happen to you, please follow up by contacting Customer Support for further guidance. In most cases after thermal runaway, cooling can be initiated and will complete normally. Then please follow the guidelines at Solutions, below |
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4. Cooling bean lock
When beans lock only during cooling, this is known as cooling bean lock. This happens when the fan slows during cooling.
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