I had this same problem on our AEG dishwasher. The reason was on the controller board. There is one relay switch which drives the heater element.One of the legs of that relay box was disconnecteds from the circuitboard. Check this out.
At the front door on top of it are the electronics,turn the electronic box loose and open it,get out the prints and on one of them is the heating command,this is probably burnd trough if you have opened the machine while it was heatening,you have to solder it with an electronic solder iron.
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Use a mulimeter to check the voltage to the heaters when the dishwasher is started on. If there is no supply to the heaters then the fault lies with the program controller drive. It can be failure of the relay or the contacts. Or it can be problems in the main program controller not outtputing to switch on the heaters..
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Check your heating element..
A bad heating element causes many problems in dishwashers…
All Hobart dishwashers will have a wash tank heating element, but the rinse water is not heated by the dishwasher, unless it has a built-in booster heater. Usually a separate booster heater is used to heat rinse water to 180-190 deg. F for hot water sanitation.