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TROUBLESHOOTING
MS51W does not detect
when waving in front of it
Door does not open when
waving hand in front of the
MS51W
MS51W stays in detection
• LED will remain solid
• LED color will depend on the
DIP 2 setting
LED flashes orange or red
upon activation
MS51W causes door
activation without waving
hand
75.0068.01 MS51W 20230512
Dead batteries
Detection range is too short
Incorrect battery orientation
Incorrect MS51W assembly, causing
water to leak into the assembly
Incorrect receiver wiring/connection
Improper receiver pairing
Incorrect transmitter or receiver
frequency
Door safety system is holding the
door closed
Transmitter interference
Window pollution
Cracked or damaged window
Low battery indication
Environmental conditions
influencing sensor
Check battery life by placing your
hand in front of the MS51W. If
there is no LED indication, replace
batteries.
Check DIP 1 Position (see page 4)
and ensure DIP 3 is in OFF position
for indoor applications.
Ensure batteries are installed
properly with the right polarity (see
label on product).
Ensure all components of the
assembly have been placed in the
correct orientation (see page 6,
step 6).
Ensure silicone is applied to the
holes in mounting boxes to prevent
water intrusion.
Check wiring and relay connection.
Check receiver pairing with
transmitter.
If using wireless transmitters and
receivers, ensure that the operating
frequencies are the same.
Clear the safety system to ensure
that nothing is in detection.
Ensure that a plastic junction box
is used.
Check sensor window for any dirt
and debris. Wipe sensor window
with a non-abrasive, lint-free cloth
if necessary.
Replace the MS51W.
See page 4, step 3.
orange = replace soon
red = replace immediately
Increase immunity settings (see
page 4, step 3).
Remove moving or reflective objects
in front of the MS51W.
Ensure that door movement is not
causing detection.
Detection range is too long. Switch
to short range (see page 4, step 3).
Page 7 of 8
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