I recently prepared a pork roast, but it wasn't ready in time for supper. Once it was fully cooked, I switched it over to "warm" for the night to be ready for today. But now I'm a little worried if it is still good. I have heard that as long as the "warm" setting maintains a heat above 140f it should be fine, but I do not have a functioning thermometer to test this. If someone else has a PC550 slow cooker, and can give me a reference of the (approximate) setting (warm, 1, 2, 3) temperatures, that would help!
What temperature is the “warm” setting of a PC550 slow cooker
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I, like you, assumed that a slow cooker would have a temperature regulator. I took mine apart, in a bid to find the thermostat and adjust it -- and discovered that it does not have one.
Cheap slow cookers contain an heating element which delivers a constant low heat, and all you can do is choose between two or three levels of power. It does not stop supplying that heat when the contents reach a particular temperature. It just keeps pumping that heat into your food.
This means that -- as long as less heat is lost out of the cooker walls/lid than the element is putting in, the contents will keep getting hotter until they reach boiling point, whereupon the energy will instead go into turning liquid into steam.
I don't know whether more expensive slow cookers have a proper thermostat. It would be good to know.
It sounds like you were expecting slow cooking to be like sous vide. Well, it's not. The point isn't controlled sub-boiling temperatures, it's something on the border between simmering and boiling for foods that just need a long time to cook at that approximate temperature.
Slow cooker recipes are not supposed to be very sensitive. They're expecting to be approximately boiling for most of the time, and the difference between low and high is pretty much whether the boil is marginal or a bit more substantial. In many cases, this just matters because the quantity in the pot varies, and it takes more to keep the stuff at the top hotter if it's farther from the bottom, or if it hasn't all cooked down into the liquid yet. In either case, it shouldn't be a full rolling boil; it's just boiling on the bottom, so the rest of the liquid is probably a bit below the boiling point. And yes, this is still slow cooking. It's not boiling fast enough to lose a huge amount of liquid (or worse, boil over) with the lid on.
I wouldn't really try to assign temperatures to slow cooker recipes. Like I said, they shouldn't be that sensitive. If your bean soup recipe didn't work, maybe it was a bad one. But "reliable" in the context of slow cooker recipes doesn't mean "exact times and temperatures". They're generally things that will be perfectly fine if you cook them 25% longer. Not everything in the kitchen has to be precise and formulaic; slow cookers and slow cooker recipes take advantage of that fact. And even if you do try to calibrate, you'll have trouble, since there's a temperature gradient from bottom to top. Unlike sous vide, a slow cooker is not constantly well-mixed. In equilibrium it'll be boiling at the bottom, and 10-20 degrees cooler at the top.
If you really wanted to use a sous vide controller, I imagine something like 95-98C would work for basically every slow cooker recipe, no matter whether they say high or low. Of course, mixing thoroughly enough to make your controller actually work, you may be overstirring whatever you're cooking. But the point is, things you cook in a slow cooker aren't really going to care much what the exact temperature is; it just matters that it's hot, near boiling, and not boiling so fast that it sticks on the bottom or loses a lot of liquid.
Finding reliable recipes... Well, it's like anything else. If you're looking on the internet, you have to learn to judge for yourself and look for warning signs, or stick to sites with lots of reviews. You also have to accept that sometimes you have to test for doneness and be flexible about time. This isn't really unusual; baking recipes should always have some kind of test ("until golden brown") and the actual baking times will vary. (With something like bean soup, sure, maybe the recipe was bad, maybe you didn't soak enough, maybe the beans were a little different. A stovetop recipe wouldn't have been precise either.) If all that isn't good enough for you, buy a slow cooker cookbook; tons of those have been published in recent years.
Best Answer
Raher late advice given your posting date, but perhaps helpful if you still have and use the PC550.
As long as temperature is over 63C chill quickly. For instance put in small containers and then put them in cold water. Then refrigerate or freeze. And before use reheat thoroughly; preferably on a stove top rather than in a slow cooker.
Note if the warm temperature is not holding at 63 or above the food is not safe to eat, but surely a slow cooker on warm will be designed to hold warm at above 63. I do not have this model of slow cooker, and did not find the manual for PC550 on the internet.
I did note a post regarding a Presidents Choice slow cooker pointing out it automatically turns off after keeping warm for 6 hours, although the post did not specify the model of PC slowcooker. You may therefore need to check it is still keeping warm. And as advised by @rackandboneman you really would benefit from having and using a food thermometer.
Note advice is usually that food may be held indefinitely in a slow cooker if over 63 degrees C or as in this USA advice over 140F (that is 60C) https://www.foodsafety.gov/keep-food-safe/4-steps-to-food-safety