Problems Possible causes You should try this
9. 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). Refer to the FAN MOTORS SPEED SELECTION table in
Section 5 Wiring Diagram
to know what the reading must be. 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). Refer to the FAN MOTORS SPEED
SELECTION table in
Section 5 Wiring Diagram
to know what the reading
must be. 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
ohms values are the same, the motor is not defective. Replace the
motor capacitor.
10. The defrost cycle does not • Ice deposits may be hindering • Remove the ice.
work (the fresh air duct is the damper operation.
frozen) OR the fresh air • The damper rod or the port • Inspect these parts and replace if necessary.
distributed is very cold. damper itself may be broken.
• The damper actuator or circuit board • See point 6.
may be defective.
11. The integrated control • The 30-second boot sequence • See
Section 3.1.1 Boot Sequence.
push button does not work. is not completed.
9. TROUBLESHOOTING (CONT’D)
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