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sorry for the misinformation earlier. I have 24 volts on the orange wire not the blue. When I unplug either of them the valve switches. However I ohmed the ambient temp sensor and it is open, could this possibly be causing my problems?

24 volts on both

I have a American Standard heat pump unit that will not switch from heat to cool.The thermostat has been replaced. The problem started after the house was struck by lightning. The switching valve will change over if either the orange or blue wire is unplugged. There is 24 volts at the control...