Need some help connecting a thermostat - Lemmy.world

I have a PTAC unit in the room above my garage (Amana PTH123A35AC) that I’m trying to connect a thermostat (Honeywell 50018270-001) to. These are my current connections: | PTAC | Thermostat | | — | — | | B | B | | C | C | | GL | G | | R | R | | W2 | W | | Y/W1 | Y | | GH | Unused | | Unused | O | | Unused | Rc | The only thing that’s not working is the cool setting. Heat and the fan are working fine. I have tried connecting R to Rc and B to O, but neither worked. I’m fairly certain I have something incorrectly wired here, but I’m just not sure which connection. PTAC Serial Number Decoded: - PTH: Standard Heat Pump PTHP - 12: 12,000 BTU/h, 60Hz - 3: 230/208V, 60Hz, 1 Phase - A: First Design Series - 35: 3.5 kW (230/208V) - AC: Standard Model Does anyone have any ideas as to why the cool setting isn’t working?