PROBLEM
❏
PIR sensor will not operate at
all.
❏
The PIR sensor will not
operate at night.
❏
Unit activates during the
daytime
❏
PIR coverage is
poor/sporadic
❏
Detection range varies from
day to day
SOLUTION
Check that the power is switched ON at the circuit
breaker/internal wall switch.
Turn OFF the power to the unit and check the wiring
connections as per the diagram (see previous section 3).
Ensure no connections are loose.
Check the lamp. If the lamp has failed, replace. Ensure that
the lamp is seated correctly in the lampholder.
The level of ambient light in the area may be too bright to
allow operation at the current DUSK setting. During the hours
of darkness, adjust the DUSK control slowly clockwise until
the lamp illuminates. Refer to previous section for more
details.
The level of ambient light in the area may be too dark for the
current DUSK setting. During daylight, adjust the DUSK
control slightly anti-clockwise. When the lamp load
extinguishes, enter the detection area. If the PIR still
activates, the setting is still too high. Repeat the above
procedure until the PIR does not activate when you enter the
detection area. Refer to previous section for more details.
Unit may be poorly located. See previous section - ‘Selecting
The Location’ and re-locate the unit.
PIR sensors are influenced by climatic conditions. The colder
the ambient temperature, the more effective the sensor will
be. You may need to make seasonal adjustments to the
sensor head position to ensure trouble-free operation all year
round.
LHT0090&91 251012:newnlht009091.qxd 10/26/12 5:17 PM Page 10
