Won't cook pc6-25 wife cooked a stew, had it on afte 1 hr didn't cook at all, can't cook or settings won't work warranty is over and ready to send for repairs. opened the bottom they said check the fuse, is it in the 2-3 in plastic sleeve

it is possible that you have misunderstood the instructions
for a slow cooker you have low medium and high
press slow cook and on low and in 8 hours the food is cooked
I see from your statements that you expect the cooker to be set on slow cook but cook at a high temperature fast
if it says slow cook --9 hours and the temp is 125 degrees , have you waited 9 hours to see if it is cooked as the slow cooking process is by the gradual build up of heat in the container that is not expelled by radiation to the air
in a pressure cooker , that build up of heat also builds up pressure and so it cooks better
other solution--- if it is not right return it for a warranty refund or if out of warranty , junk it and get a different make

It depends on how fast you want t ready to eat. Rival recommends low for 8-10 hours or high for 4 or 4 1/2 hours. Hope that helps you.

The difference is the time and how warm it cooks. Low cooks a slow, lower heat - cooks 6-8 hours. And High is a faster cook at 4-6 hours. I tend to use low for stews and chilis.

Slow cooker usually cooks stew or soups

With something that small, there is not a lot of resources for parts and repair. The item is considered a throw away. You could contact customer service at RIVAL and see what they say about the issue. Could be mis-wired or something like that. The only easily replaced part for that is the stoneware.

what is the problem this is a slow cooker and they are supposed to be left on all day ie put them on before go to work and then come the evening it is done

You should keep the lid on as much as possible. You are correct; once you open the lid, the liquid inside can quickly lose temperature at a rate of 10-15 degrees per minute.

Additionally, taking the top off allows steam to escape, which reduces the point of cooking in a slow cooker (cooking in a relatively closed system, with the steam condensing back to water and flowing back into the broth).

It's not doing a whole lot to the flavor (aside from causing the stew to thicken with the loss of water), but it is definitely causing the cooking to take longer than it should.