IC-68
ND
INSTALLATION GUIDE
14
7.5 Troubleshooting
SYMPTOM
CAUSE
REMEDY
Temperature probe reads
LO
Temperature is below -6°F
(-21°C).
Probe is disconnected or
defective.
Check all connections. If the
problem persists, and the
temperature is within normal
range, replace the probe.
Temperature probe reads
HI
Temperature is above 168°F
(76°C).
Probe is short circuited or
defective.
Check all connections. If the
problem persists, and the
temperature is within normal
range, replace the probe.
Temperature average
reads
Err
Temperature readings of the
probes used in the average
are too different and the
control is unable to calculate a
proper average.
Make sure all the probes are not
near a source of heat or cold and
working properly. If so, contact
your local distributor.
Displays are blank
Voltage selector setting is
inaccurate.
IC-68
ND
is not powered.
Ten pin flat cable between the
main and the top boards of
the IC-68
ND
is disconnected.
Make sure the line voltage
selector switch is properly set.
Make sure the control is
powered.
Make sure the 10 pin flat cable is
connected.
Display reads
8.8.:8.8.8.
and
Err
continuously
Configuration memory
integrity has been
compromised.
Download the configuration once
again (see section 7.3).
Variable speed fans
hooked to a VSM or VPM
make humming noises in
auto mode, but they work
correctly in manual
mode.
Variable fans hooked to a
VSM or VPM module are not
connected on the same phase
and tension as the IC-68
ND
.
Make sure the IC-68
ND
is on the
same phase and the same
tension as the variable speed
fans that are hooked up to a VSM
or VPM module.
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