Changing Display name on a DT300 handset - NEC Electra Elite 32D-1 Corded Phone

https://ideacom.org/wp-content/uploads/SV8300-Terminal-Guide_-r4.pdf

https://ideacom.org/wp-content/uploads/SV8300-Terminal-Guide_-r4.pdf

Free online manual:

https://www.manualslib.com/manual/600306/Nec-Dt300-Series.html


NEC DT300 Series User Manual

If you have the Admin password then follow this procedure:
For a DT330 (24-Button with 4 line LCD)
Do not lift the handset and press the Speaker button
Enter #*#*
Enter the 4 digit admin password and press the Transfer button
The phone will now display 'Program Mode'
Select Base from the four options using the associated softkey
Enter 15 and press the select softkey 2 times
The Extension Number and Ext Name will be displayed
Find the Extension Number you want to change the Extension Name for using the + and - softkeys
Press the Mic button to go to the Ext Name line
Enter the New Name using the number dial keypad.
If you make an error the Recall button will delete a character to the left and the Hold button will delete all characters to the right of the cursor.
Press the Transfer button to accept the new name.
Press the Answer button 4 times or until 'Program Mode' is displayed.
Press the Speaker button.
The system will save the changes and return the display to normal.

Click link to download the Manual

http://www.hardwiretelecom.com/pdfs/Tosh-DP5000series-guide-full.pdf

Copy following lin
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#DT300
Press reset button and reprogram

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

There is no repair for defective timer.
The DT300 is sold under at least 3 different brands and product numbers, and each manual shows identical steps for choosing 12H and 24H format.

The manual says to press and hold CLOCK button until display shows 24H. Then press HOUR button to change to 12 hour format.
I am guessing this step cannot be done if timer has programming in memory, so timer has to be reset first by pushing in reset button for a few moments.

Open following links to identify timer and download manual:
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#DT300
http://waterheatertimer.org/pdf/DT300-series-manual.pdf

Add a comment for more help

Take a moment and rate answer for accuracy:
And take advantage of fixya expert assistance live.
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Thank you for very clear question, and timer identification.
1) I don't have repair for defective timer.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#DT300
http://waterheatertimer.org/pdf/DT300-series-manual.pdf

2) Choose DT300 format
#3 says to press-and-hold CLOCK button until display shows 24H or 12H
Then release CLOCK button.
Next press HOUR button to select either 12H or 24H
This lets you choose am-pm format -or- choose military-time format where 11pm is 23

3) Set current time
Press-and-hold CLOCK button throughout whole current time setting.
Do not release CLOCK button until current time settings are finished.
Next, press HOUR button, and then MINUTE button, and then DAYS button until current hour, minute and day display.
Then release CLOCK button.
If this step does not work, then timer has gone bad.
Replace with locally available Utilitec 155671 from Lowes or Westek TE06WHB from Target
http://waterheatertimer.org/Woods-timers-and-manuals.html#59377

4) How to set DT300 timer program for full week of operation.
Each program requires you to set program 1 ON time and program 1 OFF time
Be careful to avoid program conflicts and overlaps so timer works as expected.

For program 1 ON time, you press PROGRAM button until 1 and ON display.
Release Program button.
Then select hour, minute and days. In this case you want all days of week, so you keep pressing DAYs button until whole week displays: Mo Tu We Th Fr Sa Su

Then you set program 1 OFF time, you press PROGRAM button again until 1 and OFF display.
Release Program button.
Then select hour, minute and days. In this case you want all days of week, so you keep pressing DAYs button until whole week displays: Mo Tu We Th Fr Sa Su

If you set ON time for all days of week, and OFF time for Tu Tuesday, then timer will not work correctly.

5) Read manual and add a comment for additional help

* Press SPEAKER key *Dial 700 Enter extension number Use keypad to enter name (up to 12 characters) (note: # = Accepts an entry (only required if two letters on the same key are needed - ex: TOM). Pressing ## = Space.) *Press HOLD *Press SPEAKER key

Naming your Handset:
Press Menu and Scroll down to Handset and Press OK
Scroll up or down to Label Press OK
To delete the existing handset name press the Clear button repeatedly.
Enter new name then press OK - confirmation tone
To exit, press and hold Clear button.

The display is disappearing on my phones - does this mean they are terminally ill?

This is how I did it:
1. Press the 'Program' button 2. Then dial ** (star, star) 3. Enter the password (usually 1234) 4. Press 'Next' until you get to 'Ext Name' 5. Press 'Enter' 6. You will need to know the Extension Number of you phone, when you find out enter it (eg: 104 or whatever yours is) 7. Press 'Clear' to get rid of the old name then start entering the new name via the number keys. Note: If you keep cycling through the letter on each number you can get to lowercase or uppercase letters. 8. Press 'Enter' then you are all done... pick and hang up the handset.