This diagnostic encodes the same isolation ladder our field technicians use on paid visits: whether one device or your whole home is affected, what your modem lights mean, whether the problem is WiFi placement, an overheating box, evening congestion, or a genuine provider outage. It covers no-connection and dropout problems, slow speeds, and device fixes for Windows, iPhone, smart TVs, printers, and consoles. Every path ends in a verified DIY fix or an honest "that's your provider's job" — and if it points at us, you already know the problem is inside your home, which makes the visit faster. Built from 1,900+ real home visits in Calgary.