my dishwaser doesn't warm its water what could be wrong

My whirlpool 1dp252 dishwaser doesn’t warm its water and im not sure where to find the termostat…

Cannot find any info using the given model number, please check it.

First remove power from the unit
Then one wire from the heating element and check it with a meter, usually around 20 ohms.

Next there is often a hi-limit thermostat wired in line with the heater and attached to the bottom of the tub. Remove one wire from it and check it with a meter, should be 0 ohms