whirlpool diplomat ADP8332 Dishwasher?

My wife tried to wash wax candles in our dishwasher!!!
I spent ages filtering out the wax and cleaning the filter.I have flushed through the machine with hot water via the drain hose.I can no longer see any wax residue.I have run a couple of wash cycles on hot, but after a while it stops and flashes f4.I just can't put my hand on the instruction booklet/manual. Is there any access to the drain pump,which may need a clean.Any ideas please?