[M&M]

On my unit, the eol resistor is on the gateway in the rear, heat pump, unit. The gateway is located in the return air section. After removing the cover, two screws and cutting the foil tape will give you access.

If you describe the symptoms you are having, the wealth of knowledge on this site, is likely to help you trouble shoot. The first thing you try is a full power cycle of the inCommand system that includes killing power to the gateways. That process often solves problems where the gateways are confused.