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Blower Motor Controller Fault Codes & Troubleshooting
NOTE: If no fault condition exists, the LED will be green. If a fault condition exists, the LED will flash
redhen a local keypad is not connected. All faults can be reset by cycling the reset control input,
pressing the stop key, or cycling power, except as noted in the Corrective Action column below.
NOTE: To recycle power, disconnect power for a full minute, or until the LED extinguishes, before
reapplying power.
Reliance Blower Motor Controller Fault Codes & Troubleshooting
# of
LED
Flashes
Fault
Description
Fault Cause
Corrective Action
2 Control Input
• Illegal control input sequence • 3–wire: Verify Start and Jog inputs
are not both ON
• 2–wire: Verify that only one input
(Forward, Reverse, or Jog) is ON
2 Function Loss
• Start attempt while STOP
(function loss) input is off
• Verify STOP (function loss) input
is ON before attempting to start
drive.
3 Under Voltage
• Low input line
• Temporary loss of input line
• Check input line to verify voltage is
within operating specifications
4 Over Voltage
• High input line
• Decel time too fast
• Overhauling load
• Check input line to verify voltage is
within operating specifications
• Increase decel time
5 Drive Overload
• Excessive driven load • Reduce the load
5 Motor Overload
• Excessive driven load • Verify P-02 is set correctly
• Reduce the load.
• Check for mechanical binding
6 Over Temperature
• Operating environment is too hot
• Fan is blocked or not operating
• Excessive driven load
• Verify the ambient temperature is
<50ºC
• Verify clearance above/below
drive
• Check for fan obstruction. Replace
if necessary
• Reduce the carrier frequency (P–
64)
• Reduce the load
7 Over Current
(300%)
• Shaft rotation blocked
• Excessive driven load
• Output wiring is incorrect or
shorted
• Check for obstructions to shaft
rotation or reduce excessive load
• Increase accel/decel time
• Verify output wiring is correct
8 Bad Keypad
Connection
• Bad connection from keypad to
drive
• Verify keypad is properly
connected to drive
• •