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9. TROUBLESHOOTING (
P
ROBLEMS
The damper system
does not work
7
(ERV100SP unit only)
(AMBER error code).
A. The supply motor does
not work, but exhaust
motor works.
8
B. The LED flashes RED.
Unit
shows
protection
9
mode error (different than
being in protection mode)
'
)
CONT
D
P
OSSIBLE CAUSES
At power up, no RED LED.
At power up, LED lights RED and
there is a clicking sound coming
from electrical compartment, but
damper does not move:
• Ice or other things hindering the
damper movement.
• J12 unconnected or bad contact.
• Wrong connection of J8.
• The transformer may be defective
(no 24 VAC between J8-1 and J8-2).
• The damper actuator
may be defective.
Damper moves but does not stop
when supposed to:
• Bad connection of J12 connector.
• Damper PCB defective or damper
motor stripped gear.
• The main PCB is defective.
• The supply motor may be defective.
• The supply motor capacitor or the
PCB may be defective.
• The exhaust motor may be defective.
• The exhaust motor capacitor may be
defective.
• Tranformer wire(s) bad connection.
• The transformer or the PCB may be
defective.
• Wrong selection of defrost cycle.
• Defective motor or damper.
• Stale air flow choked (unbalanced
unit, filters or outdoor port clogged,
etc.).
• Inside temperature too low (around
64°F).
Y
OU SHOULD TRY THIS
• See point 5.
• Remove ice or hindering elements.
• Check J12 connection (both harness side and board side).
• Check J8 connection.
• With unit powered and J9 connected, check if there is about
20-24 VAC between transformer connector J8-1 and J8-2
(ORANGE wires). If no, change the transformer.
• Replace the damper system.
• Check J12 connection (both harness side and board side).
• Replace the damper system.
• Replace the main PCB.
• Plug supply motor to J5 connector and exhaust motor to
J4 connector. If the 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 LED flashes RED, the
supply motor capacitor is defective. If there is no change,
the PCB is defective.
• 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.
• Check J8 and J9 connectors, as well as BLUE and RED
wire connections from J9.
• Move JU1 jumper from pins 2 and 3 to pins 1 and 2. Set the
unit on high speed. If exhaust motor works, the transformer
is defective. If it still does not, change the PCB.
• Refer to Section 3.2 or 3.4, according to the unit model.
• Inspect the complete unit, make sure both motors are
running, make sure the damper system closes and seal
properly.
• Inspect the complete ducting, clean the filters, stale air
inside grille, etc., balance the unit).
• Unit is using the inside temperature to defrost itself, so a
very low room temperature can harm the defrost system of
the unit.
24
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