Thanks for reply. Well, the wires are fine. They’re just extension of thermocouples. But I still unplug them all as you suggest.
I actually have two 134 boards(I shall name them 134a and 134b). I set them both as jumper A0, which means Address 1. Board 118 on Address 0 as always. When I use 134a or 134b alone, they both worked fine.
Once I combined 118 and 134a, 134a would come up with around -240 C on all channels even I unplugged all the wires and thermocouples.
For 118 and 134b, 134b would show “Open” on all the channels though I connect one thermocouple on Channel 0 (and it works when 134b works alone).
P.s. I reboot my Pi and check EEPROMS every time.
That’s really weird. If the problem is with my Pi, two 134 boards should have the same “Symptom”.