problem with my indesit idl 500 dishwasher

[dansweeneynufc]

Hi all, I have just bought a indesit idl 500 dishwasher second hand just to get me going and the first time i used it, it comes up with two flashing green lights number 2 and 4. From what I've read it says it is a problem with the heating circuit. Now the machine seems to go threw its cycle ok till it gets to the drying cycle and then it comes up with the two flashing lights. The machine gets hot from it doing it's other cycles. Any ideas?
Thanks.

 

[rocks1]

Run a cleaner in it. It's caked up on the heater.

 

[dansweeneynufc]

Tried cleaning it but still get the flashing lights. Could this be the sensor?

 

[rocks1]

No it's gonna be the heater relay on the Pb. New pcb req.