Broan ERV90HCS - Manual (Page 26)

11. TROUBLESHOOTING
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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 does
not work.
• The damper actuator or the
integrated damper port
mechanism may be defective.
• The circuit board may
be 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.
3. The wall control does not
work OR the indicators
flash.
• The wires may be in reverse
position.
• The wires may be broken.
• The wire in the wall OR the wall
control may be defective.
• 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.
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.
• The wires may be in reverse
position.
• The Humidity Control or push
button may be defective.
• Ensure that the color coded wires have been connected to their appropriate
places.
• Jump the OL and OC terminals. If the unit
switches to high speed, remove the
Humidity Control 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 Humidity Control or the push button.
5. The supply and/or exhaust
motor do not work.
• The circuit board may be
defective.
• The motor(s) may be defective.
• 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 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.
• 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 (the fresh air duct is
frozen OR the fresh air
distributed is very cold.
• Ice deposits may be hindering
the damper operation.
• The damper rod or the port
damper itself may be broken.
• The damper actuator or circuit
board may be defective.
• Remove the ice.
• Inspect these parts and replace if necessary.
• See point 2.
7. The integrated control push
button does not work.
• The 30-second boot sequence is
not completed.
• See Section 4.1.1 Boot Sequence.
NO C NC I OC OL Y R G B
VE0097
NO C NC I OC OL Y R G B
VE0098
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.
• Thermistor error.
• Damper error.
• The door is open and the unit
is not unplugged.
• Exhaust motor error.
Replace the entire port assembly (fresh air from outside port).
Go to Point 6.
Close the door and press once on the integrated control push
button to reset the unit.
Go to Point 5.