User guide
Doortello Business
Issue 1.00
Page 44
Trouble shooting
The door phone can not be programmed
1. Check if you are using the right password.
2. Check if the automatic answer feature was deactivated. In this case you have to
answer the call manually at the door phone.
3. The DTMF tones your system is sending may have a too high level. Try to
program the device using an incoming external call.
The door phone does not dial
1. Check if a telephone line is connected to the device.
2. Check if the the telephone line has a open circuit voltage between 20 and 60 V
dc.
3. May be that the initialisation procedure was not correctly completed. Please call
again the door phone, wait for a busy tone and try then again.
4. Check if the chime button you are using is programmed and has the correct
address.
After connecting the telephone line the device will size the line all the time
1. Disconnect the DB bus connector on the unit, may be that one of the chime
buttons has a short circuit.
2. Check if the the telephone line has a open circuit voltage between 20 and 60 V
dc.
3. Disconnect and reconnect the telephone line and the external power supply if
installed. Make a new initialisation of the device.
After a telephone connection a loud feedback tone is heard at the door
phone
1. Check volume of loudspeaker and microphone.
2. Check if you are using the full or half duplex feature. If you have a feedback you
have to use the half duplex functionality.
3. If you have a behind panel installation check that the device is correctly
installed. The microphone and loudspeaker have to be in contact with the front
plate.
4. Check that the microphone is in aligned with a hole to the outside. If necessary
you can extract the microphone from the housing and install it otherwise.
The door opener will not be activated
1. Check if the door opener has a adequate power supply. The contact in the door
phone is a dry contact and doesn’t have power to supply the door opener. Try to
short circuit the screw contacts to see if the door opener works correctly.
2. Check if the driver contact is supplied with min. 6 Vac/dc. If the voltage is below
this value (i.e. TTL driver) the driver contact doesn’t work. In this case you have to
use an external relay or the DB RU 1 unit.
3. Check is the driver contact is correctly programmed.
4. The driver contact can be activated only after a call answer and speech
detection (green LED and microphone must be on).
