Brand: HUAWEI
Category: Other
Document Type: Manual
Language: EN
Manual for ETS2251
Uploaded: Nov. 21, 2025, 7:45 p.m.
Manual Publish Date: 2006-01-01
Warranty Information
No warranty information is explicitly stated in the provided pages.
- Basic Cautions: Check fittings and read the manual before use.
- Electronic Device Precautions: Keep away from high-precision electronic devices.
- Hospital Precautions: Do not take into operating rooms, ICUs, CCUs, and switch off near medical devices.
- Traffic Safety: Do not use while driving; secure the FWT. Switch off before boarding aircraft.
- Operating Environment: Avoid magnetic fields, extreme temperatures, flammable gas, and water. Clean with a dry cloth.
- Emergency Call: Use for emergency calls, but connections are not guaranteed.
- Battery Handling: Handle with care, avoid contact with skin/eyes, do not dispose of in fire, and use specified batteries.
- Power Adapter: Use specified AC power, avoid short-circuiting, keep away from liquids.
- USB Cable: Connect/disconnect in the specified order to avoid damage.
- Environmental Protection: Dispose of materials according to local laws.
Troubleshooting and error codes
| Problem | Troubleshooting Steps |
|---|---|
| Display screen keeps OFF after FWT is turned on (no external power adapter) | 1. Open battery case to check if battery is installed. 2. If installed, battery voltage may be weak. Power on with a power adapter. |
| Display screen keeps OFF after FWT is turned on (external power adapter connected) | 1. Check if the power adapter voltage meets FWT requirements and if it's the correct adapter. 2. Check if external voltage is stable. Power on with a battery if unstable. |
| No signal indicator on the screen | 1. Check if the antenna is installed properly. 2. Contact the carrier to check signal coverage. |
| No time indicator on the screen | 1. Check if the antenna is installed properly. 2. Adjust antenna or move FWT to a better signal location. 3. Contact the carrier to check signal coverage. |
| "Sorry, the calling is out of service, please call later" prompt (dialing normal) | If facsimile is not supported, turn off PC facsimile function: Menu > Settings > Common > Data Service > FAX Mode > Off. |
| Caller ID displayed without ringing (dialing normal) | If facsimile is supported, turn off facsimile function: Menu > Settings > Common > Data Service > FAX Mode > Off. |
| Screen sometimes displays no information, sometimes power supply/battery indicator after FWT is turned off | No information is normal after power-off. Power supply/battery indicator means the FWT is charging. |
| Hear ring tone after hearing busy tone | External call is coming. Answer if not in a conversation. |
| Hear ringing tone when ready to dial or dialing | External call is coming. Answer if not in a conversation. |