Whats means SRU and CLL message in Kenmore Dryer?

I would unplug the machine for about half hour this should wipe the fault codes from the machine.

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Clean the lint filter and shut down the machine for 5 minutes. Restart and see if the codes clear. If no problem, no worries, just ignore the codes.

Clean the entire exhaust duct from the back of the machine all the way out of the house, if the codes don't change. Call a service tech... CLL SRV = call for service

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Most likely a broken wire in the dual heating element. Pull the cover off the machine, with the power cord unplugged and put a voltmeter on Ohms checking for continuity of the elements. Also check the overheat fuse(s) for continuity.

Check for clogged or restrictions in the exhaust vent. I had a bees nest once on the outside which restricted the door on the vent from fully opening, which lead to an overheat condition.

It might be that is uneven

Re: Kenmore Elite 417; error CLL SRV We have well water and I think my error message and locked door were because the machine was trying to plump water and not getting any. I heard the error beeping and sent to check it out. There was another noise that didn't stop even after unplugging the washer, although the beeping did, which finally stopped after I turned off the water valves. Press and Hold the power button down to unlock the door and retry. If you still have trouble, call for service.