Manual 2100-597G
Page 63 of 68
Check line power to motor
Check between red and black wires for line power
Verify ground by checking green eire to L1 and L2 line power
Check for 24VAC common signal to motor
(against Transformer "R" Signal)
Check "BR" terminal of fan logic control board
Check "Blue" fan lead on "Fan Relay Terminal" of "Fan Logic Control"
** Is not energized in cooling mode until low ambient fan cycling control is closed by 325 PSIG
refrigerant pressure.
Check 24VAC "hot" outputs (to "Blue" on fan logic control) to motor. See the following tables based upon outdoor temperature and model of
operation.
O.D. Temp Sensor 24VAC Signals Between
Below 55°F Orange to Blue
Between 56° - 69°F White to Blue
Between 70° - 85°F Yellow to Blue
Between 86° - 112°F Orange and White to Blue
Above 112°F White and Yellow to Blue
If the output signals are not matching the specified temperature range, go to Table 6 and verify the thermistor output
curve. If the motor is receiving proper communications and proper high voltage power, and is still not running,
proceed with motor replacement. (When checking the resistance/temperature curve, don’t forget about the optional
2.2k ohm fan control resistor assembly.)
TABLE 6
Troubleshooting ECM™ 142R Outdoor Fan Motor
TABLE 7
Cooling Mode
Troubleshooting Fan Logic Control
Please reference the Thermistor Temperature/
Resistance Chart in this manual (Table 5 on page 46).
• GREEN STATUS LED – Blinks indicating there is
a call for fan operation (simultaneous to call for
compressor operation) and is normal.
• RED STATUS LIGHT (LA) – Is illuminated when
low ambient control switch is in the closed
position. (NOTE: This is not required in heat pump
operation as the low ambient switch is bypassed in
this mode of operation.)
• YELLOW STATUS LIGHT (B) – Is illuminated
when there is a reversing valve call (for heat pump
operation). (NOTE: As mentioned above, this mode
of operation negates the low ambient fan cycling
control.)
If the board is reading a fan temperature thermistor
value of 3375Ω or less (equivalent to 125°F or an
"open" sensor), the fan will operate at the highest
speed setting (energizes "W" and "Y" outputs on the
board).
If the board is reading a fan temperature value
of 118,110Ω or greater (equivalent to -10°F or a
"shorted" sensor), the fan will operate at the highest
speed setting (energizes "W" and "Y" outputs on the
board).
If the low ambient switch is open, the red light will not
be illuminated and the "BR" terminal will show open.
The "BR" terminal is the "24 volt common" switching
output to the outdoor fan motor.
Replacing the Motor
This motor is replaced in one piece. The control
cannot be replaced separately from the motor. Even if
the control is remotely located, the replacement part
will be a new control with harness and new motor.
Be sure to have the correct replacement motor from the
manufacturer that is a direct replacement for the failed
motor.
USING THE WRONG MOTOR VOIDS ALL PRODUCT
WARRANTIES AND MAY PRODUCE UNEXPECTED
RESULTS.
Always mount the replacement motor and control
according to the manufacturers specifications using
all required hardware to reduce vibration. Make sure
all wires are free of the fan blade and not pinched in
mountings or cabinet through points.
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