E8
Meross Wi‑Fi Module Hardware Fault

Thermostat shows E8 and Wi‑Fi icon may flash; app cannot control the thermostat reliably.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed 2.4 GHz Wi‑Fi module on PCB, Antenna connection broken or shielded by metal box, Overvoltage or surge damage to communication module

How to Fix / Troubleshooting

Safety: Turn off power before opening or removing the thermostat.

Steps:

  • Check installation environment: If the thermostat is mounted in a metal back box or behind a metal panel, Wi‑Fi signal can be severely attenuated. Reposition the thermostat or use a plastic back box.
  • Test network: Verify that your 2.4 GHz Wi‑Fi network is active, not hidden, and that the SSID and password are correct in the Meross app. Ensure the router is within range.
  • Reset network settings: Put the thermostat into pairing mode (usually by holding the main button until the Wi‑Fi icon blinks) and re-add it in the Meross app. If E8 persists, the module may be defective.
  • Check for firmware update: If you can briefly connect, update to the latest firmware via the Meross app, then power cycle the device.

Resolution: If the Wi‑Fi module remains non-functional and E8 is constant, the main PCB or Wi‑Fi daughterboard must be replaced. Local manual control may still work.

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Repair Difficulty

Medium 3/5

Required Part

2.4 GHz Wi‑Fi Module / Antenna Assembly
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