No error code but not heating the water Samsung WW91J5446EW

[BigD]

We have had this washing machine about three years and it's been okay but it has suddenly stopped heating the water.  The machine carries out a cycle as normal and does not generate an error code. 

A Samsung authorised engineer has been and says the element is okay, and to be honest he was a bit flummoxed with the lack of an error code.  His only suggestion is to change the PCB but no guarantee that it will solve the problem.  Given that the cost of changing the PCB is halfway to a new machine it doesn't seem worth it.

Any other suggestions as to what we could check/try first.

What is experience of changing the PCB  - worthwhile or an expensive risk?

Thanks in anticipation.

Edited February 24, 2021 by BigD
Grammar!