Thermo Products MG-1018 operation manual B. Troubleshooting Charts

Models: MG-1018

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B. TROUBLESHOOTING CHARTS

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

B. TROUBLESHOOTING CHARTS

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.

DOES BLOWER SPIN FREELY?

YES

IS THERE 115V

SUPPLIED TO MOTOR?

YES

NO

NO

CONFIRM IF EITHER BLOWER WHEEL IS RUBBING AGAINST HOUSING OR MOTOR SHAFT IS SPINNING FREELY, REPAIR OR REPLACE AS NECESSARY.

CHECK 115V SUPPLY,

CONNECTION FUSES,

SERVICE SWITCH AND

DOOR SWITCH.

DISCONNECT 16 PIN

HARNESS FROM

MOTOR. IS THERE 24V ACROSS PIN12 & PIN1 AND PIN12 & PIN3

AT THE HARNESS PLUG?

YES

 

 

 

 

 

 

NO

 

IS THERE 24V

 

 

 

ACROSS R &

 

NO

 

 

B/C ON THE

 

 

 

 

 

 

 

INTEGRATED

 

 

 

 

CONTROL?

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

DISCONNECT 16PIN

 

 

 

HARNESS FROM

NO

 

INTEGRATED CONTROL.

 

IS THERE 24V ACROSS

 

 

 

PIN12 & PIN1 AND

 

 

 

PIN12 & PIN3

 

 

 

AT THE CONROL?

 

YES

CHECK HARNESS

CONNECTIONS

AND WIRE.

CHECK 24V SUPPLY

TO INTEGRATED CONTROL.

REPLACE

INTEGRATED

CONTROL.

 

TURN THERMOSTAT MANUAL FAN

 

 

 

 

 

 

SWITCH ON (IF AVAILABLE) OR JUMPER

NO

 

BETWEEN R & G ON INTEGRATED CONTROL.

 

 

 

 

IS THERE VOLTAGE GREATER THAN

 

 

 

12V BETWEEN PIN15 & PIN1?

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

CHECK CONNECTION ON HARNESS AND MOTOR,

RECONNECT HARNESS TO MOTOR, IF

CONNECTIONS ARE GOOD AND MOTOR STILL

DOES NOT RUN REPLACE MOTOR.

CHECK CONNECTIONS AND WIRES AT INTEGRATED CONTROL, IF OK REPLACE INTEGRATED CONTROL.

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Thermo Products MG-1018 operation manual B. Troubleshooting Charts