Trane heat pump reversing valve not switching to cooling mode Jumped R to O wires outside for testing purposes, unit switched to cooling mode correctly Found ecobee thermostat wired incorrectly for a heat pump with fossil fuel auxiliary furnace. Corrected wiring Run tested system Data tag calls for 8⁰ liquid line subcooling Actual measurement was 1.5⁰ Added 1lb of R410a Subcooling now 8⁰