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The CFE 410/420 (open potato fryers) have an auto top off feature. This system automatically maintains the oil level in the fry pot, assuming the reserve oil pan is kept filled.
If the fry pot is underfilled, the top layer of product will not cook right, or at all. Additionally, if the oil level gets so low that the heating elements are exposed, this can cause the fryer to overheat, burn the oil, and potentially cause a fire. It is for these reasons that maintaining the oil level is so important.
The CFE 410/420 has an oil level probe—which is another temperature probe—above the main temperature probe on the front side of the fry pot. It can be easily identified by the small metal guard on the side of it.
The control panel subtracts the reading of the temperature probe from the reading of the oil level probe to get a temperature difference, ∆T. If ∆T is greater than or equal to 15°F, this is understood as the fry pot being low on oil or empty. If ∆T is less than or equal to 10°F, this is understood as the oil level being full.
If the fry pot is low on oil, the auto top off pump activates for four seconds, pulling fresh oil from the reserve oil pan (the jib) and injecting it into the fry pot. After four seconds, the pump shuts off and the fryer checks ∆T again. This cycle will repeat up to eight times, after which the fryer will prompt to check the reserve oil.
Ignoring the check reserve oil message can result in the pump to run off air and eventually burn out.
If the o-rings on the jib are worn out or missing, the pump will suck in air and not pump oil as well, if at all.
The pickup tube inside the jib has only a very small hole the oil is pulled through, and it is very easy for this tube to get blocked or clogged.
For more info on the auto top off system, watch this video:
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