Panasonic KX-T4300BA - Manual (Page 60)

When pressing the SCREEN/PLAYBACK button, 3 beeps sound
and operation cannot be accomplished.
—Someone is operating the answering system.
—You are too far from the base unit. Approach it.
4 short beeps are heard twice from the portable handset.
—A new message is just recorded on your answering system.
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After plugging in the AC adaptor, the cassette deck does not
stop rewinding.
—Disconnect the AC adaptor, and insert the micro cassette tape.
Then connect the AC adaptor again.
The Cali-Counter showed when you returned home.
—Power failure took place. If new messages have been recorded
after the power is restored, the Call-Counter cannot count them, so
press the MESSAGE PLAYBACK button for confirmation.
I cannot use the unit during a power failure.
—The unit will not function during a power failure. We recommend
that you connect a reserve telephone (standard telephone) and use
it during a power failure, (p. 11)
The unit does not work.
—The connection of the unit was made improperly, (p. 10)
—The battery of the portable handset becomes weak. Charge the
battery fully, (p. 53)
The ВАТТ LOW Indicator flashes.
—Charge the battery fully, (p. 53)
I charged the battery for 10 hours, but the ВАТТ LOW indicator
flashes after a few telephone calls.
—Clean the battery charge contacts and charge once more. (p. 53)
—It is time to change the battery. Please replace with a new one.
(P- 54)
The beginning of the cassette tape has remained unrewound
after the unit rewinds the tape.
While operating the unit, the AC adaptor feels warm.
The CHARGE indicator Sight never goes out while the portable
handset is on the base unit.
—These are normal conditions.