15
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.
ERROR TYPE
ACTION
UNIT STATUS
LED flashes GREEN
Thermistor error
Replace thermistor
Unit works but will defrost frequently
LED flashes AMBER
Damper error
Go to point 6
Unit does not work
LED flashes RED
Motor error
Go to point 9
Unit does not work
Problems
Possible causes
You should try this
1
Unit does not work.
The circuit board may be defective.
Unplug the unit. Disconnect the main control and the op-
tional(s) controls(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.
The fuse may be defective.
Check if fuse F1 is blown. In that case, replace fuse F1 as
per product nameplate.
2
The damper actuator does not
work.
The damper actuator or the integrated
damper mechanism may be defective.
Unplug the unit. Disconnect the main control and the op-
tional controls(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 VAC, replace the en-
tire damper assembly.
NOTE:
It is normal to experience a small delay (7- 8
seconds) before detecting the 24 V AC signal at start- up.
This signal will stay during 17- 18 seconds before disap-
pearing.
The circuit board or the transformer
may be defective.
If there is no 24 V AC, check for 24V AC between J8- 1 and
J8- 2. If there is 24V AC, replace the circuit board, and if
there is no 24V AC, change the transformer.
3
The wall control does not work.
The wires may be in reverse position.
Ensure that the color coded wires have been connected to
their appropriate places.
The wires may be broken.
Inspect every wire and replace any that are damaged.
The wire in the wall OR the wall con-
trol may be defective.
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.
4
The Dehumidistat (or Humidity
control) does not work OR the
20- minute push button timer
does not work OR its indicator
light does not stay on.
The wires may be in reverse position.
Ensure that the color coded wires have been connected to
their appropriate places.
The Dehumidistat (or Humidity con-
trol) or push button may be defective.
Jump the OL and OC terminals. If the unit switch to high
speed, remove the 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 Dehumidis-
tat or the push button.
5
The supply and/or exhaust motor
do not work.
The fuse may be defective.
Check if fuse F1 is blown. In that case, replace fuse F1 as
per product nameplate.
The jumper JU1 may be in wrong po-
sition or missing.
Make sure that jumper is properly located as per wiring
diagram on page 12.
Jumper J11 may be missing.
Make sure there is a jumper on connector J11.
The circuit board or transformer may
be detective.
NOTE:
Refer to the FAN MOTOR SPEED SELECTION table
of the wiring diagram on page 12 to know what the voltage
reading must be. Press on the integrated control push but-
ton until the unit turn on low speed (the LED will light AM-
BER). Using a multimeter, check the voltage on J4- 1 and
J4- 2 (for supply motor), and on J5- 1 and J5- 2 (for ex-
haust motor). Then set the unit on high speed by pressing
on the integrated control push button one more time (the
LED will light GREEN). Using a multimeter, check the
voltage on J4- 1 and J4- 2 (for supply motor), and on
J5- 1 and J5- 2 (for exhaust motor). If all the readings cor-
respond to the right voltage values, the circuit board is not
defective. If one or both readings are different, change the
transformer. If no voltage is present, change the circuit
board.
The motor(s) or capacitor(s) may be
defective
Using a multimeter, check the ohms value on each motor
connectors. For BLUE and BLACK motor wires, the right
value is
49 ohms. For BLUE and BROWN motor wires, the
right value is
79 ohms. For BROWN and BLACK motor
wires, the right value is
126 ohms. If the ohms values are
the same, the motor is not defective. Replace the motor
capacitor.
6
The defrost cycle does not work
(the fresh air duct is frozen) OR
the fresh air distributed is very
cold.
Ice deposits may be hindering the
damper operation.
Remove the ice.
The damper rod or the port damper
itself may be broken.
Inspect these parts and replace if necessary.
The damper actuator or circuit board
may be defective.
See point 2.
7
The integrated control push but-
ton does not work.
The 30- second boot sequence is not
completed.
See Unit Booting Sequence, page 9.
