Please help, new tech just out of school. Sent on no heat call today, heat pump with air handler. A/C running fine. house tstat said indoor temp was 70, I turned on heat and set at 73. I removed door on air handler and board is flashing once green. this is call for cooling, however tstat is saying heating. I go to outside unit push contactor in and it runs, let go and it stops. I removed power from the reversing valve and reapply and I can hear the reversing valve move. when its on a/c outside unit runs fine, I switched out t stat and still only one green flash call for cooling. white is for heating 2nd stage does this sound like a bad wire? I bump tstat up to 85 and electric heat kicks on . outside unit is still not running. air handler board still has one green light for cooling. Any suggestions.