[RipNC]

Jimmy,

Attached photo is my HP controller (same model as yours). The red wire to the left provides the 12v needed for temp sensor. Possibly this wire to both units (likely one circuit) has an issue or a 12v fuse that is blown. Check the wire for voltage. Controllers are the larger of the 2 boxes inside the forward plenum access of the RTU (remove plastic cover, the the sheetmetal cover on top front of unit). The smaller boxes are the gateways.

PS - the small red and white wires just right of the larger red wire are the room sensor wires (tiny fragile wires!).