Fujitsu General Air Conditioner Wi Fi Control Error 1720

⚡ Quick Answer: The Fujitsu General air conditioner Wi-Fi control error 1720 signifies a communication failure with the Wi-Fi module. This results in the FGLair app d... ✅ DIY Fixable

What Does Error 1720 Mean?

The Fujitsu General air conditioner Wi-Fi control error 1720 signifies a communication failure with the Wi-Fi module. This results in the FGLair app displaying connection errors and an inability to complete commands, particularly those related to device history or filter resets. To resolve this issue, ensure that your smartphone or tablet is connected to the same Wi-Fi network as the air conditioner and check the router settings for any restrictions.

Common Symptoms:

  • Error message 1720 shown in FGLair app during wireless control
  • App unable to complete certain command or read specific data from the air conditioner

Possible Causes

  • Command failure related to reading device history or resetting filters via Wi‑Fi control (medium)

How to Fix Error 1720

DIY Fix Check and stabilize Wi‑Fi and app connection

  1. Ensure smartphone/tablet is connected to the Internet and same Wi‑Fi network that the AC is using.
  2. Verify the wireless router is powered on and properly configured (no firewall or MAC filter blocking).
  3. Restart the router and the FGLair app and retry the operation that triggered error 1720.
  4. Power cycle the air conditioner (turn off, wait ~1 minute, then turn back on).

Technician Only Verify Wi‑Fi module connection and app registration

  1. Confirm the Wi‑Fi module is correctly installed and within effective Wi‑Fi range.
  2. Check WLAN adapter and air conditioner registration status in FGLair app and re‑register if needed.
  3. Use diagnostics tools/apps to pull logs and determine if communication or module hardware issues exist.

Parts needed: Wi‑Fi module (WLAN adapter), Wireless router

🛑 When to Call a Pro:
  • If error persists after network and registration troubleshooting
  • If Wi‑Fi module hardware appears faulty or unresponsive
  • If multiple different error codes occur simultaneously in the FGLair app

Technical Specifications

wattage N/A
component Wi-Fi Module
resistance N/A
part_number FJ-WIFI-MOD-01
voltage_rating 24V AC

Common Questions

What does 1720 error mean on Fujitsu General air conditioner Wi Fi control?

Error 1720 indicates a communication failure with the Wi-Fi module, causing connection errors in the FGLair app.

Can I fix Fujitsu General air conditioner Wi Fi control 1720 error myself?

Yes, ensure your device is on the same Wi-Fi network, check router settings, and restart the app and router.

How much does it cost to fix 1720 error?

Estimated repair costs range from $0 to $150, depending on whether you need a new Wi-Fi module or technician assistance.

When should I call a technician for 1720?

Call a technician if the error persists after troubleshooting, if the Wi-Fi module seems faulty, or if multiple errors occur.

Sources & References

Data last verified: 2026-07-01

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