Midea R290 E7 Error

Fixing the E7 Error on Midea R290 Units

Some Midea R290 heat pumps may show an E7 error even when the unit has not malfunctioned.

This is caused by an issue in earlier firmware (V1.0.0.125) and can be resolved by upgrading to firmware V1.0.0.147 or later.

The firmware update corrects two problems:

• Misreading the communication protocol string, which caused incorrect fault displays.
• An incorrectly configured Tbt setting, which could also trigger the E7 error.

Updating the firmware usually clears the error and restores normal operation.

How to Update the Firmware (OTA)

Before you start

• Ensure your wired controller is powered on and connected.
• The update requires an internet connection (via Wi-Fi or a mobile hotspot).

If you haven't already connect your phone to the Midea Smart home app :

video here

Once connected

1. On the home screen, press Menu (three bars on the left) + Down Arrow for about 3 seconds.

   Enter the password 999 the press the ok button (circle in the middle) (if requested — some software versions may not require it).

   The screen will display: “Updating, please wait...”

   • Wait until the progress indicator reaches 100%.
   • The controller will restart automatically.
2. After restart, check the HMI software version. It should show V1.0.0.147 or above.

After Updating

1. Enter the Serviceman Menu by holding the menu and right arrow at the same time
   • enter the password 234 then press the ok button (middle circle)
2. Go to Input Definition.
3. Set TBT = No.
4. Press Menu to exit and return back to the home menu.

✅ Your Midea R290 unit should now run on firmware V1.0.0.147 or later and the E7 error should no longer appear.