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In vary rare cases the hot air trapped in the bottom of the roast chamber has heated will heat some beans to the point where they begin to smoulder. In such a case you will see billows of dense black smoke, or in exceptionally rare cases you will see glowing beans or flames. If this is the case, turn the roaster off at the wall and treat as a chaff fire: either cover the top of the chaff collector with a pot lid, or remove the roaster to outdoors and wait for the fire to burn itself out. This is a very rare situation that most Kaffelogic users will never see. If it results in damage to the roaster contact customer support for assistance.

In the normal case simply press ▶ to start cooling and wait for the cooling cycle to complete. In most cases the beans you were roasting will be ruined because the beans were not roasted evenly and the roast stopped early.

When the beans are cool and the roaster has stopped you need to make adjustments to your roasting practice so that the beans circulate adequately throughout the next roast cycle. This might be means using a smaller load or a higher fan speed: details are in the Bean lock articlefan speed. Check for initial circulation and adjust fan speed with Fan preview. For a more detailed explanation see Bean lock.

Is Bean Lock the only cause of these warnings?

No. There are other possible causes, but they are rare.

1. If an element burns out during a roast you will get a thermal dip warning shortly after the element stops working. Test for this with a subsequent empty roast test: see Roaster not heating. The roaster will show a ‘Heat too slow’ warning during the empty roast test and your element needs to be replaced.

2. If an element is malfunctioning (faulty thermal link, but element not burnt out) this can cause either thermal dip or thermal runaway warnings. This can be tested with a standard test roast:

   1. recalibrate bean circulation,

   2. use beans of average size and density such as most Colombian varieties,

   3. roast a 120g batch, and

   4. use the default profile (Kaffelogic Classic).

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