My karcher steamer has run out of water but I can't undo it to put more in, it has locked up, how can I open it please

helen, November 2015

I've tried operating the outlet control to let the pressure out but it's still locked solid

helen, November 2015

From READING THE MANUAL:

3.6 Refilling with water
Note :
When the water in the boiler has been used up, the red low-water warning lamp (A6) will illuminate. The safety cap (A2) cannot be opened while there is any pressure at all in the boiler.

Manual Here:

https://www.karcheroutlet.co.uk/Manuals/Steam%20Cleaner/K%201105%205960-099.pdf

RTFM, November 2015

Operate the outlet control and let the pressure out - the lid is stuck fast because of internal pressure.

Good Luck..., November 2015