Attempts to connect to an MR-VAV-AX and make a change has no effect.
Looking at the MCU Configuration, the address shows to be communicating, but the Communications show a lot of bad CRCs or No Reply.
Variety of causes, check below to troubleshoot.
There are a couple of things that you need to look at:
- Verify that the controller has a proper power supply and it is grounded properly.
- Verify that it is communicating to the MRI properly and there are no shorts or anything on the Sub-LAN wire.
- After checking these, go back to the MCU Configuration and look at the comm. Stats again, if these are still showing bad CRC’s or No Reply then the unit (MR-VAV) itself may be bad and would have to be replaced.