Lights 1 & 5 on means the anti-flooding signal has been tripped (for models fitted with Aquasop device only). Try resetting. I have a DW1710E Smeg Dishwasher and I found the reset button on mine. Whether this is the same as yours you will find out. Behind the plinth, your dishwasher has a steel panel. I removed this and exposed the wiring, the reset button is red and at the leftmost part of the machine, on the "ceiling" of the bottom on the machine (if that makes sense!). Remember to switch off first. Good Luck.
M Wilson, March 2008
