The dishwasher starts ok and fills with water but the spry bars do not spin. The water heats up and the soap dispenser opens. At the end there are two of the LED's flashing which are the second and fourth ones from the left. I was told that these lights indicate a heater fault but the water heats ok, the part that doesn't seem to work are the spray bars spinning and spraying water. The water will also drain away ok. I have some basic knowledge of fault finding but not sure how the heater would cause this type of fault. I have already checked the pump for any blockages and all is ok, impleler spins freely. Any advice would be appreciated.