A bit more info may help with a diagnosis.
Can you feel any of the external panels or top getting warmer?
Can you hear any clicks, hisses or splutters coming from the machine when you first turn it on?
Sounds like the problem could be with a thermobloc heating element or sensing thermistor or, least likely, a control board problem.
I would not recommend taking any panels off to investigate further unless you have had some experience working around 240V appliances.