F5
Honeywell Communication / Wi‑Fi Module Error

Honeywell AC displays F5 and may not respond to remote control or Wi‑Fi commands.

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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

Faulty Wi‑Fi module, Loose communication harness, Firmware glitch, Main PCB communication failure

How to Fix / Troubleshooting

Safety: Unplug the unit before accessing internal electronics.

Steps:

  • Reset Wi‑Fi: Follow the user manual to reset the Wi‑Fi module (often holding the Wi‑Fi or timer button for several seconds). Reconnect to the app.
  • Power cycle: Unplug the unit for 10 minutes, then plug back in and test.
  • Inspect Wi‑Fi module: Remove the control panel cover and locate the small Wi‑Fi or communication module board. Ensure its connector is fully seated.
  • Replace module: If F5 persists and the module appears damaged or overheated, replace the Wi‑Fi/communication module with the correct Honeywell part.
  • Main PCB: If a new module does not resolve F5, the main control board may have a communication fault and require replacement.
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Repair Difficulty

Medium 3/5

Required Part

Wi‑Fi / Communication Module
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