Bard WG3S2-A, Installation Instructions Manual

Manual 2100-587C

Page 

44 of 59

Troubleshooting  ECM

™

 Motors Cont’d.

Replacing ECM Control Module

To replace the control module for the GE variable-speed indoor blower 

motor you need to take the following steps:

  1.  You MUST have the correct replacement module.  The controls are 

factory programmed for specific operating modes.  Even though they look 

alike, different modules may have completely different functionality.

USING THE WRONG CONTROL MODULE VOIDS ALL PRODUCT 

WARRANTIES AND MAY PRODUCE UNEXPECTED RESULTS.
 

2.  Begin by removing AC power from the unit being serviced.  

DO NOT 

WORK ON THE MOTOR WITH AC POWER APPLIED.  

To avoid 

electric shock from the motor’s capacitors, disconnect power and wait at 

least 5 minutes before opening motor.
  3.  It is not necessary to remove the motor from the blower assembly, nor 

the blower assembly from the unit.  Unplug the two cable connectors to the 

motor control assembly.  There are latches on each connector.  

DO NOT 

PULL ON THE WIRES.  

The plugs remove easily when properly released.

  4.  Locate the screws that retain to the motor control bracket to the sheet 

metal of the unit and remove them.  Remove two (2) nuts that retain 

the control to the bracket and then remove two (2) nuts that retain sheet 

metal motor control end plate.  

Refer to Figure 19.

  5.  Disconnect the three (3) wires interior of the motor control by using 

your thumb and forefinger squeezing the latch tab and the opposite side 

of the connector plug, gently pulling the connector.  

DO NOT PULL ON 

THE WIRES, GRIP THE PLUG ONLY.  

Refer to Figure 19.

  6.  The control module is now completely detached from the motor.  

Verify with a standard ohmmeter that the resistance from each motor 

lead (in the motor plug just removed) to the motor shell is >100K ohms.  

Refer to Figure 20.  

(Measure to unpainted motor end plate.)  If any 

motor lead fails this test, do not proceed to install the control module.  

THE MOTOR IS DEFECTIVE AND MUST BE REPLACED.

Installing the new control module will cause it to fail also.
  7.  Verify that the replacement control is correct for your application.  

Refer to the manufacturer’s authorized replacement list.  

USING THE 

WRONG CONTROL WILL RESULT IN IMPROPER OR NO 

BLOWER OPERATION.

  Orient the control module so that the 3-wire 

motor plug can be inserted into the socket in the control.  Carefully insert 

the plug and press it into the socket until it latches.  

A SLIGHT CLICK 

WILL BE HEARD WHEN PROPERLY INSERTED.

  8.  Reverse the steps #5, 4, 3 to reconnect the motor control to the 

motor wires, securing the motor control cover plate, mounting the 

control to the bracket, and mounting the motor control bracket back 

into the unit.  

MAKE SURE THE ORIENTATION YOU SELECT 

FOR REPLACING THE CONTROL ASSURES THE CONTROL’S 

CABLE CONNECTORS WILL BE LOCATED DOWNWARD 

IN THE APPLICATION SO THAT WATER CANNOT RUN 

DOWN THE CABLES AND INTO THE CONTROL.

  DO NOT 

OVERTIGHTEN THE BOLTS.

  9.  Plug the 16-pin control plug into the motor.  The plug is keyed.  

Make sure the connector is properly seated and latched.
  10. Plug the 5-pin power connector into the motor.  Even though the 

plug is keyed, 

OBSERVE THE PROPER ORIENTATION.  DO NOT 

FORCE THE CONNECTOR.

  It plugs in very easily when properly 

oriented.  

REVERSING THIS PLUG WILL CAUSE IMMEDIATE 

FAILURE OF THE CONTROL MODULE.

 11. 

Final installation check.  Make sure the motor is installed as follows:

    a. Motor connectors should be oriented between the 4 o’clock   

    and 8 o’clock positions when the control is positioned in its    

    final location and orientation.

    b. Add a drip loop to the cables so that water cannot enter the    

    motor by draining down the cables.  

Refer to Figure 21.

The installation is now complete.  Reapply the AC power to the HVAC 

equipment and verify that the new motor control module is working 

properly.  Follow the manufacturer’s procedures for disposition of the 

old control module.

Figure 19

Figure 20

Figure 21