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Operation without Power
If the power cord is not plugged into the unit and no battery is installed, the unit enters
into No Power Operation mode. in this mode, the user may:
1) use the handset to manually make a call on line 1 only,
2) answer a call on line 1 with the handset.
Cordless Phone Option
It is possible to enhance your phone to a cordless feature with the additional purchase of
the H5401 accessory handset and module. The H5401 is packaged with an RF module, when
the module is properly inserted into the back of the 25423/24 base, the antenna icon on
the display will illuminate.
Troubleshooting Guide
No dial tone
• Check or repeat installation steps:
• Make sure the telephone line cords are connected to the phone and the wall jack. Make
sure the line cords are not damaged.
• Make sure the hook switch pops up when the handset is lifted.
• Check the Speaker button. Make sure the indicator is off.
• Disconnect the phone from the wall jack and connect another phone to the same jack.
If there is no dial tone in the second phone, the problem might be your wiring
or local service.
You cannot be heard by the other party.
• Make sure the handset or headset cord is inserted properly and securely.
• Make sure the Mute feature is not turned on.
Phone does not ring.
• Make sure the ringer is turned on.
• Make sure the Do Not Disturb feature is not activated.
• You may have too many extension phones on your line. Try unplugging some phones.
• See solutions for “No dial tone.”
Incoming voice too low or none at all.
• Check volume setting.
Troubleshooting Guide