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10. T
ROUBLESHOOTING
If the unit does not work properly, reset the unit by unplugging it for one minute and then replug it. If it still not working properly,
refer to table below.
If the integrated control LED of the unit is flashing, this means the unit sensors detected a problem. See the table below to know where
the problem occurs on the unit.
LED Signal
LED flashes GREEN
LED flashes AMBER
Problems
1
Unit does not work.
2
The damper actuator does
not work.
3
The wall control does not
work.
4
The Dehumidistat does not
work OR other optional
auxiliary control does not
work OR its indicator light
does not stay on.
Error Type
Thermistor error
Damper error
Possible causes
• The circuit board may be defective.
• The fuse may be defective.
• The damper actuator or the damper
mechanism may be defective.
• The circuit board or the transformer
may be defective.
• The wires may be in reverse position.
• The wires may be broken.
• The wire in the wall OR the wall control
may be defective.
• The wires may be in reverse position.
• The Dehumidistat or push button may
be defective.
Action
Replace thermistor
Go to point 2
You should try this
• Unplug the unit. Disconnect
the main control and the
optional(s) control(s) (if
need be). Jump G and B
terminals. Plug the unit back and wait about 10 seconds.
If the motors run on high speed and the damper
opens, the circuit board is not defective.
• Check if fuse F1 (located on PCB) is blown. In that case,
replace fuse F1 as per wiring diagram specifications.
• Unplug the unit. Disconnect the main control and the
optional control(s) (if need be). Wait 10 seconds and
plug the unit back. Check if the damper opens. If not,
use a multimeter and check for 24 V AC on J12-1 and
J12-2 (in electrical compartment). If there is 24 V AC,
replace the entire damper assembly.
NOTE: It is normal to experience a small delay
(7-8 seconds) before detecting the 24 V AC
signal at starting-up. This signal will stay during
17-18 seconds before disappearing.
• If there is no 24 V AC, check for 24V AC between J8-1
and J8-2. If there is 24 V AC, replace the circuit board,
and if there is no 24 V AC, change the transformer.
• Ensure that the color wires have been connected to
their appropriate places.
• Inspect every wire and replace any that are damaged.
• Remove the wall control and test it right beside the
unit using another shorter wire. If the wall control
works there, change the wire. If it does not, change
the wall control.
• Ensure that the color wires have been connected to
their appropriate places.
• Jump
the
OC terminals. If the
unit switches to high
speed,
remove
Dehumidistat or push
button and test it right beside the unit using another
shorter wire. If it works here, change the wire. If it
doesn't, change the Dehumidistat or the push button.
19
Unit Status
Unit works but will defrost frequently
Unit does not work
NO C NC I OC OL Y R G B
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and
NO C NC I OC OL Y R G B
the
VE0098
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