Troubleshooting - Varifan IC-68ND Installation Manual

7.5 Troubleshooting

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