Phason
Natural Ventilation Control
33140002
21
Troubleshooting
If you see an error code and are not sure what it means, look it up in
Alarm settings and conditions
on page 13, and then follow the instructions to resolve the condition.
The following table lists some problems, possible causes, and possible solutions. If you are having a
problem using the NVC-2, see if the problem is in the following table and then follow the directions
for correcting the problem.
Problem
Possible cause
Possible solution
The power supply components
are blown, or there are burn
marks on boards and
components.
Motors and fans slow down or
stop.
There has been a power surge,
brownout, or power outage.
Avoid the problem in future by providing
proper voltage and protection for the control.
There is no power/display.
A circuit breaker at service panel is off
or tripped.
Reset the circuit breaker.
The incoming power wiring is
incorrect.
Correct the wiring.
The display shows unusually
high or low temperature.
The probe is not a Phason probe.
Remove the probe and then install a Phason
probe.
The extension cable connected to the
temperature probe is providing a poor
connection
Check the extension cable connection and re-
solder it if necessary.
The temperature probe is damaged.
Replace the probe.
The curtain opens when it
should close, or closes when it
should open
The wiring is incorrect; the close and
open wires are reversed.
Correct the wiring. For more information, read
Connecting a curtain machine
on page 6.
The alarm relay is not operating
the alarm system.
The alarm wiring is incorrect.
Correct the wiring. For more information, read
Connecting an alarm system
on page 7.
Optional accessories and kits
Phason Rain Sensor
The Phason Rain Sensor (model PRS) connects to the
NVC-2 and allows it to close the curtain when rainfall is
detected.
When the sensor detects rain, it sends a signal to the NVC-
2. When the NVC-2 receives the signal, it completely closes
the curtain, bypassing the on and off durations. After 15
minutes with no rain, the control returns to normal operation.
