Broan HRV90H Series Installation Instructions Manual page 26

11. TROUBLESHOOTING (
P
ROBLEMS
A. The supply motor does
not work, but exhaust
motor works on both
high and low speeds.
B. The integrated control
LED flashes RED.
C. The integrated control
LED flashes RED;
exhaust motor does not
work on both high and
low speeds.
5
D. The integrated control
LED flashes RED;
exhaust motor does not
work on low speed but
works on high speed.
E. The integrated control
LED flashes RED;
exhaust motor does not
work on high speed but
works on low speed.
The defrost cycle does
not work (the fresh air
duct is frozen) OR the
6
fresh air distributed is very
cold.
The integrated control
7
push button does not work.
' )
CONT D
P
OSSIBLE CAUSES
• The supply motor may be defective.
• The supply motor capacitor or the
PCB may be defective.
• The door is open and the unit is not
unplugged.
• The exhaust motor may be defective.
• The exhaust motor capacitor may be
defective.
• The transformer or the PCB may be
defective.
• The 18 μF low speed capacitor wires
may have a loose connection.
• The 18 μF low speed capacitor or
the PCB may be defective.
• The connection between BLUE wire
from J9 connector to BLUE wire from
transformer may be loose.
• The transformer or the PCB may be
defective.
• 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.
• The 30-second boot sequence is not
completed.
Y
OU SOULD TRY THIS
• Plug supply motor to J5 connector and exhaust motor to
J4 connector. If the integrated control LED flashes RED,
the supply motor is defective. If exhaust motor works, plug
back supply motor to J4 connector and exhaust motor to J5
connector, then check for supply motor capacitor validity.
• Plug supply motor capacitor to J7 connector and exhaust
motor capacitor to J6 connector. If the integrated control
LED flashes RED, the supply motor capacitor is defective. If
there is no change, the PCB is defective.
• Put a magnet over the door switch or close the door and
press once on the integrated control push button to reset the
unit. Check both high and low speeds using integrated push
button.
• Plug exhaust motor to J4 connector and supply motor to J5
connector. If supply motor works but exhaust motor does
not, exhaust motor is defective. If exhaust motor works, plug
back supply motor to J4 connector and exhaust motor to J5
connector, then check for exhaust motor capacitor validity.
• Plug exhaust motor capacitor to J6 connector and exhaust
motor capacitor to J7 connector. If exhaust motor works
but supply motor does not, the exhaust motor capacitor is
defective. If there is no change, check validity of transformer
or PCB.
• Move JU1 jumper from pins 2 and 3 to pins 1 and 2. Set
the unit on high speed (press 2 times on integrated push
button, the LED will light GREEN). If exhaust motor works,
the transformer is defective. If it still does not, change the
PCB.
• Check both low speed capacitor wires connections.
• Plug the RED wire from J9 connector to RED wire from
transformer. If it works, the 18 μF low speed capacitor is
defective. If it is not working, the PCB is defective.
• Check BLUE wires connection.
• Move JU1 jumper from pins 2 and 3 to pins 1 and 2. Set
the unit on high speed (press 2 times on integrated push
button, the LED will light GREEN). If exhaust motor works,
the transformer is defective. If it still does not, change the
PCB.
• Remove the ice.
• Inspect these parts and replace if necessary.
• See point 2.
• See Section 4.1.1 Boot Sequence.
26