Vcm-oa Communication Down -

During a transition from a primary to a standby OA, or when a faulty OA is replaced, the VCM may fail to re-authenticate or recognize the new management module.

If the network traffic is unaffected, start with a software-level reset. vcm-oa communication down

Disable economizer control entirely. Convert the unit to 100% return air or fixed minimum OA (based on local code). This prevents free cooling but guarantees no freeze-up. Set a recurring service reminder. During a transition from a primary to a