Zanussi dishwasher ZDT21006FA ……. Not heating up

I have had a anti flood (3 beeps) problem, I cleared a small blockage around the impellor, dried out the bottom overflow tray and sensor, the beep alarm cleared and all appeared good. However I quickly realised the water was no longer heating up, I have run different programmes from ECO to 70 degrees and it is still not heating up. Logic says that the first problem isn’t related the heater but I also can’t believe they have both developed at the same time. Zanussi tech support can only suggest a 30 min full power down to re-boot things but this has not resolved the problem. Has anyone come across this problem before or have any suggestions.