The webpage is not working since JavaScript is not enabled. Most likely, you are viewing using Dropbox website or another limited browser environment.
In Browser navigate to
http://www.power-electronics.co.nz/tools/fault-codes/FaultCodes.htm
Hit the settings button – it’s three vertical dots, locating in the top right of the screen
Then hit Save to Home Screen
You will now have the Web App shortcut on your Homescreen