I also have a shiny new clean tank now as the other started leaking! so that may help things.
Now you can take the whole thing back to Aldi and get a refund!!!
I hope the tank I have a my Mums doessn't start to leak as she will not be too happy with me as she has it in her new consevatory and water will not do the floor any good.
When I first rang Pennine about problems with her tank I got the impression that the lights was not the only complaints they were having!
Edit: Just seen your other post so this one is pretty irrelevant now!