Hi, I have a Carrier fv4bnf002 fan coil which was installed in 2004. Here is the manual for it: https://dms.hvacpartners.com/docs/1009/Public/05/IM-FV4B-01.pdf
The fan runs constantly when the thermostat wires are totally disconnected from the Easy Select PCB.
It runs constantly if the low voltage connector is completely removed from the control module that sits right on top of the motor.
I did the troubleshooting steps in the manual for the Easy Select board and it seems to check OK. The fuse on the board was also fine.
Based on this, does it seem like the control module on the motor needs to be replaced? I'd actually go ahead and replace the whole motor and module assembly because the motor has gotten a bit noisier over the years.