Bosch WFL1880Au control board replacement issues

I have just replaced the control board of my Bosch WFL 1880AU30 loader after some months of it sitting idle since the previous control board blew up (from water exposure).
On the first run I heard a popping noise, the machine went through the motions of filling and spinning but continued to overfill after some minutes. I have tried trouble shooting the relevant parts such as the water valve and pressure sensor, making sure there was no blockage in the airhose etc.
We removed the water inlet valve and found continuity but were unable to test whether the mechanical side could be faulty as it is a sealed unit.
On replacing the original water inlet valve, I tried a further trial run without clothes and Eureka, the machine completed the cycle set at 30 and showed the relevant LED for the end of the cycle. We thought we had resolved the issue, but on the first wash with clothes the machine overfilled yet again.
Could anyone shed light on this problem. A Bosch service person suggested the water valve might be faulty as well as the timing function on the PCB. Also we didn’t reprogram the machine when we replaced the PCB as we assumed it would be the same configuration as the secondhand PCB was from the same model machine. Also if it was a PCB fault would the machine have completed the full wash cycle if the timing was faulty? We are planning to buy another cold water inlet valve but before we commit can anyone give any suggestions of what the problem might be or where we go from here.