Identify the equipment before pressing more buttons
Find the remote model and each indoor model from safely visible labels or the home's records. Note the outdoor unit or units they connect to. Ask the owner, landlord, or service provider for the correct user manuals and any installed wall controller or app details. If you rent, report problems through the owner rather than authorizing equipment changes yourself.
Ask whether the remote sends commands only, receives status, or controls a group. Have the provider explain what the displayed temperature represents, which indicator confirms reception, and how timers or schedules affect a head after a normal command. Also confirm whether the heads must share one operating mode.
Establish settings you can track
With the exact user instructions, choose one head and send the desired normal mode, temperature, and fan setting from a position intended to reach it. Confirm reception by the documented indicator and observe that head's response. Record those settings and do the same for the others. If you cannot reliably address only one head, ask the provider for the approved solution rather than covering sensors, changing hidden addresses, or experimenting with service menus.
Keep a simple room list with the intended settings. Label remotes if the provider recommends separate ones. Ask for a demonstration of changing one room without unintentionally changing another and of canceling any unwanted user timer through the correct normal controls.
If the screen changes but a head does not respond, record which command and indicator you saw. Ask the provider to check compatibility, reception, and system operation. Do not take a new battery or an apparent beep as proof that the heating and cooling function is correct.
Your next step: Get the matching manuals and a brief controls demonstration. Confirm and record each room's settings so everyone in the home can use the system consistently.