On some IFB washers, the CH indicates that the child lock (control panel lock) has been activated to avoid accidental washer use. On the IFB digital 5 KG washer, you can toggle the child lock on and off by pressing the Soak Option and Delay Start buttons simultaneously. These are the second and fourth button for the Optional settings above the LCD display on this model. Below the keys, there is a skeleton key symbol in the center of a line drawn between these two keys. You can see this information in the manual for this machine in the manual, http://www.ifbindustries.com/home_appliances/washing/manuals_new/DIGITAL_5_KGS.pdf
. See page 9 (7 of the PDF) and page 13 (page 11 of the PDF).
I hope this helps. Please add a comment with your model number for information specific to your washer. If your washer uses a different set of keys to toggle the child lock on and off, you should look for the skeleton key symbol on the control panel housing. Any response to a follow-up comment may be delayed.