You need a multimeter to check the element/wiring. Most Whirlpool dishwashers have a removable baseplate, once off you can get at most components (not the pcb...that is in the control panel).
Hi mate, tested the heater and was not working ordered one online and fitted at the weekend difficult to get to as all underneath but is now working perfectly. thank you for your help all fixed for £47 bargain
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