21
8. TROUBLESHOOTING (
CONT
’
D
)
P
ROBLEMS
P
OSSIBLE
CAUSES
Y
OU
SOULD
TRY
THIS
8 A
The supply motor does
not work, but exhaust
motor works.
• The supply motor may be defective.
• The supply motor capacitor or the
PCB may be defective.
• 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
test the supply motor capacitor.
• 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.
The LED flashes RED.
• 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.
• 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 supply
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, test 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.
Table 8 A only applies for HRV160 unit.
