I have a 15XT which errors out during cold start in cold weather. If you let it warm up after start up (up to 1 1/2 hours or 15 minutes if you put a heater in the side cabinet) it will continue on with the cold start with no problem. Since all 3 axis error out I assume its not the axis amps failing but a power supply problem to the amps. I have 187 VDC at the blue cap although the output on the solid state relay is only 84 VAC (input to the relay 120 VAC) is this about right? Fault errors are either #1 or #3 for X,Y, & Z. Once it cold starts it will run all day without problems. Got me stumped.