Thank yoy for your question. The CL indicates the unit is in a Control Lock mode. This is sometimes referred to as child lock and is meant to prevent accidental option or cycle changes while the dryer is running. Check the keypads and look for a small padlock emblem. This is the keypad that turns the control lock feature on or off by pressing and holding the switch. If a model number is provided I can provide the keypad to press to turn off the control lock feature.
I have the same question about clearing the CL code. Mine is model 61422. Initially it said clear filter, and I have done all clearing of lint that I can find. I hope there is a reset code somewhere, and holding the lock down did not work for me.