Hi @frustrated21702 ,
As you said a 7-1 error code is a heating problem.
I realize that you said that you replaced the heater element and also the hi limit thermostat so if the water is still not heating you need to check that the thermistor on the control board is OK and also that the heater circuit* is OK i.e. harness wires no corrosion on pins or loose broken wires in the circuit.
Here's the tech sheet for the dishwasher.
On p.5 there's the Water Heating/Heat Dry and Water Sensing with O.W.I. Sensor (Water/Air/Soil/Temperature) wiring diagram* which shows the circuit path for the heater. It also shows where to test the thermistor on the control board.
There's also a wash/rinse circuit showing the wash pump circuit and a diverter valve circuit. If the spray arms aren't moving check that diverter valve as it redirects water away from the spray arms and to the drain pump when draining is required.
Just some things I would check
Be safety aware and disconnect the power to the dishwasher and use an Ohmmeter to test as much of the circuit path as possible. The circuit operates at 120V AC.
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