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7. Troubleshooting
Problem Possible Cause Solution
Constant Alarm on
one or more unused
zones.
Unused zones not
jumpered.
Connect a wire
between the COM
and NC terminals of
all unused zones (see
section 4).
Constant low tem-
perature and humid-
ity readings.
12 Vdc supply (pin
1) shorted to ground
or overloaded.
Correct short
circuit—examine all
sensors that use the
12 Vdc power
supply.
No communication
with UPS or acces-
sories.
Measure-UPS II has
failed.
If removing Mea-
sure-UPS II from the
host cures the com-
munication problem
for other accessories,
call technical sup-
port at the number
on the back cover of
this manual.
Incorrect sensor
readings.
Improper sensor
wiring.
Correct sensor
wiring—see
section 4.
Always reports very
low temperature
and/or humidity.
Probe not connected
properly.
Connect probe
properly—see
section 2.