Fault codes, diagnostics, and repair help.

City Multi and other commercial VRF systems.

General Mitsubishi HVAC talk that doesn’t fit elsewhere.

MSZ, MUZ, and other single/multi-zone ductless systems.

Site news, rules, and admin announcements.

Create topics here that don’t fit into any other existing category.

Discussion about this site, its organization, how it works, and how we can improve it.

SEZ, PEAD, and other ducted air handlers.

Load calcs, line set runs, install best practices.

Where to source parts, part number lookups.

Kumo Cloud, the Mitsubishi Comfort app, Wi-Fi adapters, smart thermostat integration, scheduling, and remote control/troubleshooting for ductless and VRF systems.