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16
Troubleshooting
Maintenance
The Environmental Monitoring Unit requires periodic
maintenance.
• To remove any visible buildup of dust from the
temperature and humidity probe, gently brush or
vacuum the probe. Do not blow any type of compressed
gas into the probe.
• For maintenance of contact sensors, see the sensor
manufacturer’s product literature.
Correcting
problems
Continued on next page
Problem Possible Cause Solution
Constant alarm on
one or more
unused zones.
No jumper wires
for unused zones.
For each unused zone,
connect a wire
between the
COM
and
NC
terminals.
Constant low
temperature and
humidity readings.
12
VDC
supply
(pin 1) shorted to
ground or
overloaded.
Correct the short
circuit: examine all
sensors that use the
12
VDC
power supply.
Incorrect sensor
readings.
Improper sensor
wiring.
Correct the sensor
wiring. (See “Contact
Sensors” on page 7.)
Continual reports
of low temperature
or humidity.
Probe not
connected
properly.
Connect the probe
properly. (See
“Connecting the
probe(s)” on page 5.)