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The app does not find your air conditioner? Seven fixes
Discovery runs over Bonjour/mDNS, which some routers block. Work through these checks and try manual IP entry when the unit is reachable but discovery fails.
Your Mitsubishi Heavy Industries air conditioner paired fine, the Wi-Fi light is on, and the app still shows nothing. This is the single most common problem with Wi-Fi air conditioner control, and it is almost never the air conditioner's fault.
Check the full Mitsubishi Heavy Industries brand name and your WF-RAC or WF-RAC-HTTPS interface before changing network settings. Model names differ between countries; a similar product name does not confirm that the same Wi-Fi module is installed.
MyAirco finds units with Bonjour/mDNS, a multicast announcement on your home network. Plenty of routers filter exactly that traffic while happily passing everything else. The unit is online - you just are not hearing it.
Work down this list. Manual IP entry can bypass discovery, but the unit still needs to be reachable on your home network.
1. Check both devices are on the same network
Obvious, and still the most frequent cause. Your phone and the air conditioner must be on the same Wi-Fi network - not the guest network, not a separate IoT SSID, and not a neighbouring mesh network your phone drifted onto.
If your router publishes 2.4 GHz and 5 GHz under different names, your phone may be on the 5 GHz one while the air conditioner sits on 2.4 GHz. That is fine if the router bridges them, and many split-band setups do not.
2. Allow the app to find devices on your Wi-Fi
Android asks for permission to find and interact with devices on your home network. Decline it and discovery silently returns nothing. Check the app's permissions in your phone settings and grant it, then pull to refresh.
3. Look for client isolation on the router
Often called AP isolation, client isolation or guest mode, this stops devices on the Wi-Fi from talking to each other. It is on by default on many guest networks and some ISP routers. Turn it off for your main network, or move the air conditioner off the isolated one.
4. Look for multicast or mDNS filtering
Some routers have an explicit mDNS, Bonjour or multicast forwarding toggle. Mesh systems in particular sometimes drop multicast between nodes. If you find the setting, enable it.
A quick way to test
If another phone on the same Wi-Fi finds the unit and yours does not, the router is fine and the problem is on your phone - permissions or VPN. If no device finds it, suspect the router.
5. Turn off the VPN
A VPN on the phone pushes traffic out through the tunnel, and your home network effectively disappears. Disable it while you use the app, or add your home network as an exception.
6. Confirm the air conditioner is actually connected
Check the Wi-Fi indicator on the indoor unit. Blinking means it is in pairing mode rather than connected; off means it is not on the network at all. Another check is your router's list of connected devices - if the air conditioner is not in it, this is a pairing problem and you should run setup again.
7. Enter the IP address by hand
This bypasses discovery completely, and it is the reliable fallback when a router simply will not pass mDNS.
- Find the addressOpen your router's admin page and look at the list of connected devices or the DHCP client list. The air conditioner usually appears with a name containing its model or MAC address.
- Reserve itWhile you are there, give the unit a static DHCP lease. Otherwise the router may hand it a different address later and the app loses it again.
- Add it in the appOn the add screen, choose
OR ENTER IPand type the address.
Still nothing?
Two things are worth ruling out. Confirm the unit really is a supported model: MyAirco needs an MHI air conditioner with a WF-RAC or WF-RAC-HTTPS module, and Mitsubishi Electric hardware such as MELCloud or MAC-587IF adapters will never appear. And if you recently changed your router or Wi-Fi password, the module is still looking for the old network - it needs pairing again.
Frequently asked questions
Why does MyAirco not find my air conditioner automatically?
Discovery uses Bonjour/mDNS on the home network. Guest networks, client isolation and multicast filtering all block it, and so does being on a different network from the air conditioner. The unit is usually online and reachable - only the announcement is being dropped.
Can I add an air conditioner without automatic discovery?
Yes. On the add screen choose OR ENTER IP and type the unit's local IP address. Reserve that address in your router first, otherwise DHCP may hand the unit a different one later.
Does MyAirco work over a VPN?
Not usually. A VPN on the phone routes traffic away from your home network, so the air conditioner becomes unreachable. Disable it, or exclude your home network, while using the app.
Do I have to pair the air conditioner again if it disappears?
Only if the module actually lost your network - for example after a router change or a new Wi-Fi password. If the Wi-Fi light on the unit is steady, it is still connected and the problem is discovery, not pairing.