50CR
10 seconds). Once communications with User Interface are successful, COMM LED will be lit and held on. At the same time, amber STATUS LED will be lit and held continuously on until a request for operating mode is received. The STATUS LED will be on any time unit is in idle mode.
If, at any time, communications are not successful for a period exceeding 2 minutes, the Infinity control will only allow emergency heating or cooling operation using a common thermostat and the R, C, Y, O, W terminal strip connections and will display Status Code 16, System Communication Fault, on amber STATUS LED. No further troubleshooting information will be available at User Interface until communications are
If COMM LED does not light within proper time period and status code is not displayed;
1.Check system transformer high- and
2.Check fuse on control board to be sure it is not blown. If fuse is open, check system wiring before replacing it to be sure a short does not cause a failure of replacement fuse.
If COMM LED does not light within proper time period and status code is displayed,
1.Check system wiring to be sure User Interface is powered and connections are made A to A, B to B, etc. and wiring is not shorted.
NOTE: Shorting or
C. ECM Motor Troubleshooting
The ECM motor used in this product consists of two parts: the control module and the motor winding section. Do not assume motor or module is defective if it will not start. Use the
VERIFY MOTOR WINDING SECTION
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
After disconnecting power from the ECM motor, wait at least 5 minutes before removing the control section. Internal capacitors require time to discharge.
Before proceeding to replace a motor control module:
1.Check motor winding section to be sure it is functional.
2.Remove motor control module section and unplug winding plug. Motor shaft should turn freely, resistance between any two motor leads should be similar and resistance between any motor lead and unpainted motor end should exceed 100,000 ohms.
3.Failing any of these tests, entire ECM motor must be replaced.
4.Passing all of the tests, motor control module alone can be replaced.
MOTOR TURNS SLOWLY
1.Low static pressure loading of blower while access panel is removed will cause blower to run slowly. Particularly at low airflow requests. This is normal, do not assume a fault exists.
2.Recheck airflow and system static pressure using User Interface service screens with access panel in place.
NOTE: Blower motor faults will not cause a lockout of blower operation. The unit control will attempt to run the blower motor as long as User Interface maintains a demand for airflow. The unit control will not operate electric heaters while a fault condition exists. The unit control communicates with the motor at least once every five seconds, even when the motor is idle. If, during operation, the unit control does not communicate with the motor for more than 25 seconds, the motor will shut itself down and wait for communications to be reestablished.
D. Using Motor LED in Troubleshooting
The MOTOR LED is connected to the blower motor communication line and works with the unit control microprocessor and the STATUS LED to provide unit operation and troubleshooting information. When the motor is commanded to operate, the MOTOR LED will be turned on and will flash each time instructions are sent to the motor. When the motor is commanded to stop, the MOTOR LED will be turned off.
If the MOTOR LED is lit, flashing, and the motor is running, or if the MOTOR LED is off and the motor is stopped, operation is normal and no motor fault exists.
If the MOTOR LED is lit, flashing, and the motor does not run, or if the MOTOR LED is off and the motor is running, check the STATUS LED for the Status Code. Refer to the troubleshooting instructions for the indicated Status Code in Section E, Unit Troubleshooting.
E. Unit Troubleshooting
Unit faults indicated by flashing codes on the amber system STATUS LED can be resolved using troubleshooting information provided below. Codes are listed in order of their priority, highest to lowest. Though multiple faults can exist at any time, only the highest priority code will be displayed on STATUS LED. Clearing the indicated fault when multiple faults exist will cause the next highest priority Status Code to be flashed. All existing faults, as well as a fault history, can be viewed at User Interface.
STATUS CODE 45, CONTROL BOARD TEST FAULT
Unit control has failed internal
STATUS CODE 37, HEATER OUTPUT SENSED “ON” WHEN NOT ENERGIZED:
Unit control is provided with circuitry to detect presence of a
If unit control detects a
To find the fault:
1.Stop all system operations at User Interface and check heater stage
2.Disconnect electric heater at power and check heater wiring for faults. See Status Code 36 for more information.
STATUS CODE 44, MOTOR COMMUNICATION FAULT
The MOTOR LED is connected to the blower motor communication line and works with the unit control microprocessor and STATUS LED to provide unit operation and troubleshooting information.
When motor is commanded to operate, the MOTOR LED will be turned on and will flash each time instructions are sent to the motor.
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