Siemens Gigaset 8800 Cordless Expansion Handset Logo

Question about Siemens Gigaset 8800 Cordless Expansion Handset

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8800 Gigaset lights up but won't turn on.

I have a 8800 which has been hooked upto the 8825 for about 4 years. Recently, one of my children took out the batteries and replaced them the wrong way and then set the phone back on the charger. I can along and noticed the phone off. I tried putting it back on the charger. When I pushed the power button, the phone would light up on the screen for about 20 seconds and then the lighting would turn off. Nothing appears on the screen anymore. I can call out on the phone without a display but nothing shows up on the display and is impossible to answer a call on my second line. Is the display blown? Is there a way to reset the display?

Posted by vahrmeyer on


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I have seen that problem before, and it is a terminal one, sorry. You can put the batteries in backwards, and it will be okay. However, once it is set in the charger and the phone turns on, thats when the damaged occured. There is a power protection circuit (for surges), but I rarely see them open for this reverse polarity instance. The polarity reversal of the batteries does not kill the display itself (I know I have replaced them to no avail), it kills a circuit driving the display and I see the bad signals coming from the CPU which is a 80 zillion leg micro surface mount which is not cost effective to replace. Needless to say, I have about a dozen or so of them in that condition. You can google Siemens Cordless Telephone repair for repair or replacement solutions.

Posted on Jan 14, 2008


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  1. Turn the handset off by pressing and holding the PWR key.
  2. While holding down the keys 1, 4, and 7, turn the handset back on.
  3. It will display "Handset Service".
  4. While this message is displayed, type in the numbers 4 6 8 5 4 6 3 (the word "hotline") on the number pad.
  5. The phrase "Settings Reset to Default" for a second or two and the handset will power itself off.
Note: When you turn the handset back on, the handset PIN will be reset to 0000.

Gigaset 8825 cordless phone pin reset

The default PIN for base and handsets is 0000 - if it has not been changed
  • Press Menu on Handset
  • Scroll to Mobile Settings - press ok
  • Scroll to Local Settings - press ok
  • Scroll to Chang Pin - press ok
  • Enter Current handset PIN - press ok
  • Enter New PIN - press ok
  • Display will show Confirm - Reenter PIN - press ok

Gigaset 8825 new

They are not manufactured anymore, but you can buy used ones off Ebay.

System pin unknown

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Power supply gigaset 8825

The power supply for the 8825 base is to be 13 volts AC, rated at 850 milliamps or higher. You can go anywhere from 13 up to 15 volts without hurting the unit, and a higher current rating is even better. We actually make them ourselves through bulk purchases of varieties of power supplys. Your next delimma will be the plug size, it is a pretty common size, most universal adapters will have the right size of the outer and inner connections.

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You can download the manual from the link below: You will find how to use the answer phone remotely on page 60. Please update the question & let us know if the information given was useful to you - Good Luck!
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