What a display code means and which safe checks to try before calling for service.
What the lights on a Hisense R32 wall-mounted split mean, why it can wait 3 minutes or stop its fan while heating, how to start it with the emergency button when the remote is missing, and the checks Hisense Chile's Spanish manual lists before calling for service.
What the Lt, PF, Ft, AS, ES and P1 messages mean on TCL TPW, TPC-HA and TPC-KA portable air conditioners, which ones you can clear yourself, and which need TCL service.
What to check, in order, when a TCL TPW, TPC-HA or TPC-KA portable air conditioner is running but the room stays warm: the mode and set temperature, the exhaust hose, the room, the filter, ice, and when to contact TCL.
What E1 and E2 mean on a TCL window or through-the-wall air conditioner, and the safe checks TCL lists when the unit won't start, doesn't cool, ices up, drips water indoors or ignores the remote, with the point to stop and call service.