Hi All, Have a 99' 450 EB and have a CrusAir 8000 BTU with an SMX II control panel. Thr unit is located under the master bed. Seems like the reversing valve on the refrigerant isn't working as I select heat and it keeps making cold air. 1. Where is that valve? 2. Can I check for voltage? 3. If no voltage, assuming a board issue? Thx in advance for the help!