Hob come on but all zones how the letter L in them and I dont know how to unlock it.

For the Candy CH642B cooktop:
LOCKING BUTTON OPERATION
The locking function prevents the children from starting the hob. It is also used for cleaning the control strip as the controls can be locked without the hob being on.
To lock the hob :
- Press the on/off button
- Press simultaneously " - " button and " + " button of the front right zone (CH 633 front left zone), and then press again on the " + " button of this zone.
When the hob is locked, the locking indicator " L " is displayed on all zones for 20 seconds.

To unlock the hob :
- Press the on/off button. The locking indicator " L " is displayed on all zones.
- Press simultaneously the " - " button and the " + " button of the front right zone (CH 633 front left zone), and then press again on the " - " button of this zone. The hob is unlocked.

l means locked hold two left buttons at same time or the two right buttons or the bottom two buttons or top two buttons should solve your problem you have to do it prety quick or the computer thinks a child is trying to turn on the appliance

Had the same problem, manual says switch on and press + and - buttons at same time then press - to cancel child lock. Kept trying but no luck. Tried same thing with a pan on the hob that I was pressing + key and it worked.

Hi,

You've probably accidentally activated the child-lock "L". It would help to know which model you have as the deactivation method can vary on different models. However, this is the process for activation or deactivation on the EKI-848 which looks like the one in the above picture:

Switching off the childproof lock

1. Press the ON key.

2. Then immediately press the Plus key of the cooking zone at the left-back and the Minus key of the cooking zone at the right-back simultaneously.

3. Then press the Minus key in order to deactivate the childproof lock. The "L" will go off.

If this doesn't work or you have a different model, please post back and I will let you know the correct deactivation method for your model.

Hope this helps.

Regards,

BElectric

child lock is activated , switch on hob press - and + button simultaneously hob will return to normal. if zeros dont appear try pressing and hold - key slightly before pressing +key hold both for a few secs.

Look at Baumatic 90cm Slimline 4 Hyperspeed Zone Ceramic Hob. Dimensions are 350mm x 880mm

Turn on so that all are showing L
Then press - for 5 seconds when all should show 0 then turn off.
Upon turning on all should be fine.

can't give you much guidence - will be either regulator or the plate itself. no easy way to find out. you will have to remove the hob top and check for continuity thro the plate. ifplate is ok, then power up and check for supply to the plate. if no supply, then the regulator will be at fault

Great.. finally. i manage find from solution from user guide.. L is Locked. below is the instruction. will check out tonight. 
The locking function holds the current settings, or prevents anyone from starting the hob. It is also used for cleaning the control strip as the controls can be locked without the hob being on. To lock the hob : -Press the on/off button     . -Press simultaneously " - " button and " + " button of the front right zone (PVD 633 front left zone), and then press again on the " + " button of this zone. The hob is locked, the locking indicator " L " is displayed on all zones for 20 seconds. To unlock the hob : -Press the on/off button      . The locking indicator " L " is displayed on all zones. -Press simultaneously the " - " button and the " + " button of the front right zone (PVD 633 front left zone), and then press again on the " - " button of this zone. The hob is unlocked.

Got the same problem, and remembered I've kept the manual book
L means locked. I dont know how Ive managed to do this as well

Anyway it says:

Cancelling the key lock
After switching ON the control the child safety feature can be deactivated. Here it is necessary to simultaneously operate the front right cooking-zone-select-key and the MINUS-key and then operate the MINUS-key alone. If all steps hae been carried out in the right order within 10seconds the key lock gets cancelled and the control is OFF. Otherwise the input will be considered incomplete, the control remains locked and switches-OFF after 20 seconds.

After a renewed switching-ON/OFF key all displays show 0", the display dots are blinking and the control is ready for ooking. If a cooking zone is "hot", "H" will be displayed instead of the static 0".


Followed their instructions & still not worked. ,I am still confused and baffled after these instructions........................