Secondary issue (climate on/off in combination with flickering of dash etc) ended up being a fault with the alternator (even though it was previously tested). The issues sometimes come back, but power-cycling MFT. As many as 5 complete circles may be required.
Initial issue resolved by replacing a climate control module behind the glove box. The power train control module on a Ford controls every aspect of the vehicle's engine, transmission, clutch and electrical and fuel delivery. Ford 2015 model year, SYNC-equipped Edge, F-150, Focus, and Mustang.
Reprogram hvac module 2013 ford edge 0 liter four cylinder engine that offers 155 hp at 6,000 rpm.
