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9. TROUBLESHOOTING (CONT'D)
PROBLEMS POSSIBLE CAUSES YOU SOULD TRY THIS
9B
The LED flashes RED as
soon as the unit is set to
low speed.
• The J11 connector may be
misconnected or there may be a bad
contact.
• Check J11 wires connection.
The exhaust motor does
not run at all (not even
a pulse when hitting the
button) and LED flashes
RED after 20 seconds.
• The J5 connector may be
misconnected.
• The JU1 jumper may be
mispositioned.
• The PCB may be defective.
• The motor may be defective.
• Check J5 wires connection.
• Check that JU1 jumper is positioned in H (pins 1-2).
• Invert J4 and J5 connectors. If the issue is now with the
supply motor, replace PCB. If the issue remains with the
exhaust motor, replace motor.
• Replace exhaust motor.
The exhaust motor is
running at a wrong speed
and LED flashes RED
after 20 seconds.
• The J17 connector may be
misconnected.
• The JU1 jumper may be
mispositioned.
• The PCB may be defective.
• The motor may be defective.
• Check J17 wires connection.
• Check that JU1 jumper is positioned in H (pins 1-2).
• Invert J17 and J15 connectors. If the issue is now with the
supply motor, replace PCB. If the issue remains with the
exhaust motor, replace motor.
• Replace exhaust motor.
The supply motor does
not run at all (not even
a pulse when hitting the
button) and LED flashes
RED after 20 seconds.
• The J4 connector may be
misconnected or there may be a bad
contact.
• The JU1 jumper may be
mispositioned.
• The PCB may be defective.
• The motor may be defective.
• Check J4 wires connection.
• Check that JU1 jumper is positioned in H (pins 1-2).
• Invert J4 and J5 connectors. If the issue is now with the
exhaust motor, replace PCB. If the issue remains with the
supply motor, replace motor.
• Replace supply motor.
The supply motor is
running at a wrong speed
and LED flashes RED
after 20 seconds.
• The J15 connector may be
misconnected.
• The JU1 jumper may be
mispositioned.
• The PCB may be defective.
• The motor may be defective.
• Check J15 wires connection.
• Check that JU1 jumper is positioned in H (pins 1-2).
• Invert J17 and J15 connectors. If the issue is now with the
exhaust motor, replace PCB. If the issue remains with the
supply motor, replace motor.
• Replace supply motor.
Table 9B only applies for S10 ERV ECM and 70E ECM units.
For these aforementionned units having a RED flashing LED, follow these few steps before proceeding to troubleshooting:
• Unplug the unit.
• Unplug the green control terminal connector.
• Open the unit door in order to see the motors, making sure that there is no risk of injury.
• Put a magnet over the electrical compartment, aligned with the integrated push-button
(on location where the door magnet is when the unit door is closed).
• Plug unit back and wait until the booting sequence is completed.
• Press the integrated control push-button, and observe the LED and motors.
• Proceed to troubleshooting.
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