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11. TROUBLESHOOTING
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 auxiliary 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.
2. The damper actuator •The damper actuator or the integrated •Unplug the unit. Disconnect the main control and the optional control(s)
does not work. damper port mechanism may be defective. (if need be). Wait 10 seconds and plug the unit back. Check if the damper
opens. If not, use a multimeter and check for 24V AC on J12-1 and J12-2
(in electrical compartment). If there is 24V AC, replace the entire port assembly.
NOTE: It is normal to experience a small delay (7-8 seconds) before
detecting the 24V AC signal at starting-up. This signal will stay
during 17-18 seconds before disappearing.
•The circuit board may be defective. •If there is no 24V AC, replace the circuit board.
3. The wall control does not •The wires may be in reverse position. •Ensure that the color coded wires have been connected to their
work OR the indicators flash. appropriate places.
•The wires may be broken. •Inspect every wire and replace any that are damaged.
•The wire in the wall OR the wall •Remove the wall control and test it right beside the unit using another
control may be defective. shorter wire. If the wall control works there, change the wire. If it does
not, change the wall control.
4. The Humidity Control does •The wires may be in reverse position. •Ensure that the color coded wires have been connected to their
not work OR the 20-minute appropriate places.
push-button timer does not •The Humidity Control or push button •Jump the OL and OC terminals. If
work OR its indicator light may be defective. the unit switches to high speed, remove
does not stay on. the Humidity Control or push button
and test it right beside the unit using
beside the unit using another
shorter wire. If it works here, change the wire. If it doesn’t, change the
Humidity Control or the push button.
5. The supply and/or exhaust •The circuit board may be defective. •Press on the integrated control push button until the unit turn on low
motor do not work. speed (the LED will light AMBER). 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). The reading must be ± 68 V AC. Then set the unit on high
speed by pressing on the integrated control 1 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). The
reading must be ± 120 V AC if the fan motor speed setting is
Low-High, or ± 90 V AC if the fan motor speed setting is Low-Medium.
If all the readings correspond to the right voltage values, the circuit
board is not defective. If one or both readings are different, change the
circuit board.
•The motor(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 ± 52 ohms. For
BLUE and BROWN motor wires, the right value is ± 72 ohms. For
BROWN and BLACK motor wires, the right value is ± 124 ohms. If the
ohm values are the same, the motor is not defective. Replace the
motor capacitor.
6. The defrost cycle does not work •Ice deposits may be hindering •Remove the ice.
(the fresh air duct is frozen OR the damper operation.
the fresh air distributed
is very cold. •The damper rod or the port •Inspect these parts and replace if necessary.
damper itself may be broken.
•The damper actuator or circuit board •See point 2.
may be defective.
7. The integrated control •The 30-second boot sequence •See
Section 4.1.1 Boot Sequence
push button does not work. is not completed.
NO C NC I OC OL Y R G B
VE0097
NO C NC I OC OL Y R G B
VE0098
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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 on the unit the problem occurs.
LED flashes GREEN. • Thermistor error. Replace the entire port assembly (fresh air from outside port).
LED flashes AMBER. • Damper error. Go to Point 6.
LED flashes RED. • The door is open and the unit is not unplugged. Close the door and press once on the integrated control
push button to reset the unit.
• Exhaust motor error. Go to Point 5.