EG4
Identify AC-only versus hybrid AC/DC equipment and the correct generation. Hybrid units may have independent photovoltaic supply; follow the documented isolation method for every input and do not confuse the internal inverter with a separate solar-system inverter.
Ductless troubleshooting reference
Brand documents, component causes, diagnostic checks and commissioning guidance.
Open EG4 reference →What they make
Ductless mini split
Reference for nowInverter-driven outdoor unit feeding one or more wall, ceiling or compact-ducted heads over a communicating line. The fastest-growing machine in both segments.
Inverter boards, communicating controls and electronic expansion valves — not the contactor-and-run-cap machine the board models, and dedicated mini-split tickets are on the roadmap. From the A2L start-up guide, the refrigerant handling, nitrogen and deep-vacuum discipline transfer; its charge-to-subcooling step does not — these machines charge by weight to the manufacturer’s line-length math, behind flares torqued to spec. On the call itself, flash codes and the manufacturer’s service data lead.
Tech support
The Copilot loads your EG4 equipment details. Guided diagnostic coverage depends on the equipment type; ductless and monoblock systems currently use the reference library.
Model-number decoding here covers residential and multi-family split systems and package units, 5 tons and under — EG4 equipment lives outside that scope, so the manufacturer’s literature leads on model specifics. The Copilot still loads the brand for a guided session.
Start tech support — EG4 loaded →