I have turned my device on, and wish to you the delay timer feature but when I hit the button only 1 hour is displayed and...

It sounds like your steam vents maybe clogged or blocked. At the top of your device their is 5 little slits in the plastic. These are used to help release steam from the device while it is cooking if blocked the excess is forced to condense into your condensation unit causing the over flow. So to prevent the overflow make sure the vents aren't blocked in anyway.