Troubleshooting - Broan ERV90HC Installation Instructions Manual

11. TROUBLESHOOTING

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.
LED flashes AMBER.
LED flashes RED.
Problems
1. Unit does not work.
2. The damper actuator
does not work.
3. The wall control does not
work OR the indicators flash.
4. The Humidity Control does
not work OR the 20-minute
push-button timer does not
work OR its indicator light
does not stay on.
5. The supply and/or exhaust
motor do not work.
6. The defrost cycle does not work • Ice deposits may be hindering
(the fresh air duct is frozen OR
the fresh air distributed
is very cold.
7. The integrated control
push button does not work.
• Thermistor error.
• Damper error.
• The door is open and the unit is not unplugged. Close the door and press once on the integrated control
• Exhaust motor error.
Possible causes
• The circuit board may be defective.
• The damper actuator or the integrated
damper port mechanism may be defective.
• The circuit board 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 Humidity Control or push button
may be defective.
• The circuit board may be defective.
• The motor(s) may be defective.
the damper operation.
•The damper rod or the port
damper itself may be broken.
• The damper actuator or circuit board
may be defective.
• The 30-second boot sequence
is not completed.
Replace the entire port assembly (fresh air from outside port).
Go to Point 6.
push button to reset the unit.
Go to Point 5.
You should try this
•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.
•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 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.
•If there is no 24V AC, replace the circuit board.
•Ensure that the color coded 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 coded wires have been connected to their appropriate places.
•Jump the OL and OC terminals. If the
unit switch to high speed, remove 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.
•Press on the integrated control push button until the unit turn on low
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 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.
• Using a multimeter, check the ohms value on each motor connectors. Black
motors values: For BLUE and BLACK motor wires, the right value is
± 55 ohms. For BLUE and BROWN motor wires, the right value is ± 35 ohms.
For BROWN and BLACK motor wires, the right value is ± 89 ohms. Aluminum
motors values: For BLUE and BLACK motor wires, the right value is ± 51 ohms.
For BLUE and BROWN motor wires, the right value is ± 47 ohms.For BROWN
and BLACK motor wires, the right value is ± 98 ohms. If the ohm values
are the same, the motor is not defective. Replace the motor capacitor.
•Remove the ice.
•Inspect these parts and replace if necessary.
•See point 2.
• See Section 4.1.1 Boot Sequence
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NO C NC I OC OL Y R G B
VE0097
NO C NC I OC OL Y R G B
VE0098