Troubleshooting
18
GRM
9 Troubleshooting
Repair work may only be carried out by qualified, specially trained
personnel.
Table 4: Troubleshooting
Problem
Possible reason
Remedy
Mains supply fail-
ure.
Restore mains
supply.
Mains cable is not
connected.
Connect mains
cable.
Green pilot LED of
the control unit is not
on.
Mains fuse is de-
fect.
Replace mains
fuse.
Red alarm LED on
control unit is lit and
buzzer sounds even
though there is no
alarm condition at
the sensor.
False alarm result-
ing from dirty sen-
sors.
Carefully clean
sensors.
Coding plug in
wrong position.
Place coding plug
in right position,
see chapter 6.4,
page 15.
False alarm as a
result of an open
circuit in the cable
between control
unit and sensor.
Ensure that proper
connection is re-
stored.
Red alarm LED on
control unit blinks
and buzzer sounds
although there is no
alarm condition at
the sensor.
False alarm result-
ing from a defect
sensor.
Replace sensor.
After pressing the
mute button twice
following an alarm
condition, the red
alarm lamp stays on.
Alarm condition
still exists.
The ambient air
must be free from
gases and smoke.
Additional external
alarm does not react
during an alarm
condition.
Additional alarm
instrument is de-
fect.
Exchange addi-
tional alarm unit.
