The only way we have found to resolve the NO CL error is is to reset the till completely.
Its in the user manual but if you havent got one there are lots of sites that try to sell you one. Dont buy one unless younhave a lot of reprogramming to do - just follow the startup procedure posted on the TOWA website
Alternatively here are the steps to reset:
Turn off the machine and unplug it
Turn the control lock key to P position.
Plug in the power code, holding down the C key.
It should reset.
To program the date: (still in P position)
Turn the control lock key to P position.
1 → X/Time → YY MM DD → Cash/Tend
To program time (still in P)
urn the control lock key to P position.
2 → X/Time → hh mm → Cash/Tend
If your decimals are missing (turn key to P)
press 1 press RA Press 2 Press Cash Tend
nigelthepelican, March 2016