I know I am asking a lot, but I kind of find appliances interesting, actually I do some minor repairs, for family and friends that is why i ask. But anyhow, on a reversing valve selonoid, window unit AC heatpump, if there is voltage 120 at the reversing valve, does that normally mean that the selonoid is bad if the unit is blowing cold air in heating mode. Or can the switch or thermostat be stuck. Thanks. Enquiring minds want to know.