All installations and services must be performed by qualified service personnel.- Page 12

All installations and services must be performed by qualified service personnel.

10 

CONFIRM IF EITHER BLOWER

WHEEL IS RUBBING AGAINST

HOUSING OR MOTOR SHAFT

IS SPINNING FREELY, REPAIR

OR REPLACE AS NECESSARY.

DOES BLOWER SPIN FREELY?

IS THERE 115V 

SUPPLIED TO MOTOR?

CHECK 115V SUPPLY, 

CONNECTION FUSES, 

SERVICE SWITCH AND 

DOOR SWITCH.

CHECK HARNESS 

CONNECTIONS

AND WIRE.

NO

YES

YES

YES

YES

NO

NO

NO

NO

NO

YES

YES

DISCONNECT 16 PIN 

HARNESS FROM 

MOTOR.  IS THERE 12VDC

ACROSS PIN12 & PIN1 

AND PIN12 & PIN3 

AT THE HARNESS PLUG?

CHECK CONNECTION ON HARNESS AND MOTOR, 

RECONNECT HARNESS TO MOTOR, IF 

CONNECTIONS ARE GOOD AND MOTOR STILL 

DOES NOT RUN REPLACE MOTOR.

THIS GUIDE SHOULD BE USED IN THE CASE OF A STOPPED OR MANFUNCTIONED ECM

BLOWER MOTOR.  THE FOLLOWING SHOULD HELP ESTABLISH THE TYPE OF 

MALFUNCTION OR DEVIATION FROM THE NORMAL BLOWER OPERATION.

TO USE THIS DIAGRAM, YOU JUST NEED TO FOLLOW THE INSTRUCTIONS IN THE BOXES.

CHECK 24VAC 
SUPPLY

TO INTEGRATED CONTROL.

IS THERE 24VAC

ACROSS R & 

B/C ON THE

INTEGRATED

CONTROL?

REPLACE 

INTEGRATED 

CONTROL.

TURN THERMOSTAT MANUAL FAN

SWITCH ON (IF AVAILABLE) OR JUMPER

BETWEEN R & G ON INTEGRATED CONTROL.  

IS THERE VOLTAGE GREATER THAN 

12VDC BETWEEN PIN15 & PIN1?

CHECK CONNECTIONS AND WIRES

AT INTEGRATED CONTROL, IF OK 

REPLACE INTEGRATED CONTROL.

DISCONNECT 16PIN 

HARNESS FROM 

INTEGRATED CONTROL.

IS THERE 12VDC ACROSS 

PIN 6 & PIN 1

AT THE CONROL?