Timeguard MLB98 - Manual (Page 7)

SECTION SIX
TROUBLESHOOTING GUIDE
PROBLEM
❏ Lamp stays ON all the time
at night.
❏ PIR keeps activating for no
reason / at random.
❏ PIR sensor will not operate
at all.
❏ The PIR sensor will not
operate at night.
SOLUTION
The unit may be suffering from false activation. Cover the
sensor lens completely with a thick cloth. This will prevent
the sensor from "seeing" anything. If the unit now
switches off after the set time duration and does not re-
activate, this indicates that the problem was caused by
false activation. The problem may be solved by slightly
adjusting the direction/angle of the sensor head (see
previous section).
The unit is in Manual Override Mode and will illuminate
until dawn or until reset to Automatic Mode.
To reset to Automatic Mode, switch the internal
switch/circuit breaker off/on within one second.
Holiday Mode has been selected. Switch the internal wall
switch/circuit breaker off/on with one second and the unit
will return to Automatic Mode. The light will illuminate
only when motion is detected.
You may not be allowing the unit time to complete it's
warm-up period. Stand well out of the detection range
and wait (the warm-up period should never exceed 5
minutes).
Occasionally, winds may activate the sensor. Sometimes
passages between buildings etc. can cause a "wind tunnel"
effect.
Ensure the unit is not positioned so as to allow detection
of cars/people using public thoroughfares adjacent to your
property.
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.