My 30SXi keeps giving an F13 fault. F13 apparently indicates bad connections to the PCB, but I've reconnected it several times and it still faults after a while. All wiring seems to be OK and the flow/return thermistors are the right resistance so I'm starting to think it's the controller PCB that's faulty.
Any other suggestions?
Where's the best place to buy a main PCB? (p/n 2000802731, I think)
Dave