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Most crock pots are made of porous ceramic and is relatively brittle. It is glazed on all sides (except the bottom usually), to make it hold liquids without absorption. The lids, usually glass or thermoplastic, sit of top, but do not usually fit tightly as this could crack the crock. Also, it is not a pressure cooker, so you want excess steam to vent. The lid just keeps the heat inside and allows condensation to drip back into the crock, reducing the speed at which the fluids cook off, thus the term slow cooker.
go google and type in -- user manual for mirro pressure cooker model m-0536-1-- and if there is one it will be a pdf version down load
make sure that the lid seal went in without any twists
put something under the seal and go around the lid several time to allow the seal to untwist
The valves on the lid are "floating" valves, that means they will not sit firmly on the lid. However, food and gunk can get stuck in these valves. Remove it, soak it in hot soapy water, clean the inside with a toothpick and also clean the pipe on the lid that holds the weight. Your pressure cooker should be as good as new!
Probably it was put away with dirty valves and the pressure signal is still up preventing you from opening the lid. Simply use a toothpick to push down the metal bar that sticks up from the lid, then twist and open!
Pressure cookers can be very dangerous, if it is 4 years old make sure that the gaskets are not worn and that the gauges are functional, usually it comes with a cook book for recipes, just remember that when it gets to temp, the pressure valve will be operating, it should bubble up with the venting of the steam, after the cook time is over make sure that you, do not, try to open the unit by turning the handle until the pressure has gone down, look at the guage if there is no gauge wait to cool at least 15 minutes then easy sliding the handle slowing to help release any pressure you can be injured by burns and also make sure the rubber seal around the bottom of the lid is not dry rotted and is in good shape this is the most important of all good luck, and have fun remember pressure cookers are good for mason jar cooking and storing the lids will seal as the cooling occurs and don't over flow the water keep the water level low so it doesn't boil water into the food jars, and when you put them in there just tighten them slightly do not screw the lid real tight you can do that after the pressure is maintained when they cool and you remove them.
make sure u DO NOT lock the clips while cooking, its not a pressure cooker. if you lock the lid the heat and pressure from whatever you are cooking causes an air-tight seal and the lid will shatter or the ceramic pot it self will crack...
I think E2 means open circuit in thermocouple in center of bottom. E4 means no contact on pressure sensing switch at edge of bottom. Mine had E4 error. Took out switch and used fine sandpaper to clean contact points. Now it works fine. Remove 3 screws in bottom. Remove bottom cover by turning it ~1/4" to clear tabs. Remove switch at edge of bottom with two blue wires going to it. Clean contacts and replace.