SMEG DF410S – heating problems& will not stop at end of cycl

I set a Program (cycle) to last for 43mins. and as it counts down, when it gets to 0 mins, it then for some reason jumps up to 10 mins and counts down. This is repeated continuously so the machine does not in fact stop.
When I open the door, the water is doing its thing but the heat is warm but not hot like it used to be

My dish washer model has 5 program buttons (for 5 different washes).
What is the reset sequence for this model?
We rarely use this machine (3 years old and have only used it about 20 times.)

I have dismantled the bottom of the SMEG Dishwasher & put a multi meter (Resistance) on the terminals of the heater element and it shows approx 30 ohms so I suspect this NOT being the fault plus on some wash cycles the water does slightly warm up. I have inspected the heater (and other parts underneath) and all looks fine – ie no black burn marks on the element or any other component underneath.
I could not find any reset button for the thermostat (let alone find the thermostat)! Is it integral with the heating element for this SMEG slimline model (45cm) ?

Next, I took the top part of the control unit off to inspect the PCB and again, this looks fine – ie cannot see any dry joints/blackened area’s of any signs of a problem there.
I am considering sending the PCB to ‘QER’ repairs who can check it.
Any further suggestions to what may be the problem before i do this?

Thanks Tony