Manual for installation and operation, Comfort 870 GB (#81125) 55
10. Messages
10.3 Rectifying faults
Error Cause Solution
LED 8 does not light up. - No voltage. - Check that the mains power supply is operational.
- Check the connection to the mains power supply.
- Thermal overload protection in power
transformer was activated.
- Allow the power transformer to cool down.
- Defective control unit. - Have the operator system checked.
No reaction on impulse. - The connection terminals for the
“impulse” button were by-passed,
e.g. due to a short-circuit or flattened
terminals.
- Try temporarily disconnecting any key switches or interior
push buttons that are connected to the control unit
(Section 6.6):
Remove the lead from socket XB99 and then bridge
terminals B9 and 5; insert jumper plug and check for
cabling errors.
No reaction on impulse from
hand transmitter.
- Module antenna is not plugged in. - Connect the module antenna to the control unit
- The hand transmitter coding does not
correspond to the receiver coding.
- Activate hand transmitter again (Section 8.5.3).
- Hand transmitter battery is empty. - Insert new battery (Section 7.1).
- Defective hand transmitter, control
unit electronics or module antenna.
- Have all 3 components checked.
10.3.1 Malfunctions without error messages
