When the motor is commanded to stop, the MOTOR LED will be turned off. The MOTOR LED will not flash to indicate communications when it is turned off.
Unit control is constantly communicating with the motor, even when the motor and MOTOR LED are off. If motor does not acknowledge receipt of communications, the control will display Status Code 44 on STATUS LED and continue to try to communicate with the motor. If motor acknowledges communication, status code will be cleared.
If MOTOR LED is lit and flashing and motor does not run:
1.Check the STATUS LED. If STATUS LED is indicating a Status 44 code, check the motor wiring harness for proper connection to control and motor receptacles.
2.Check motor wiring harness to be sure all wiring complies with wiring diagram description, makes a complete circuit from connector to connector, and is not shorted.
3.Check
If all checks are normal, unit control is good and control module on motor may need replacement. Check motor and Motor Control Module following the instructions in Section C, ECM Motor Troubleshooting.
Shorted or
If the MOTOR LED is off, STATUS LED is indicating a Status Code 44 and motor is running:
1.Disconnect the motor harness at the unit control. If motor continues to run, unit control is good and control module on motor may need replacement.
STATUS CODE 25, INVALID MOTOR / MODEL SELECTION
On initial
1.If motor size is incorrect for unit size or size data is invalid, Status Code 25 will be displayed on STATUS LED.
2.If model size data is missing (as is the case when a replacement control board is installed), system User Interface will prompt installer to enter correct model size from a list of valid sizes.
3.If motor size is incorrect for model size, motor must be replaced with proper size motor. Unit control will not respond to operation requests until this fault condition is resolved.
STATUS CODE 26, INVALID HEATER SIZE
On initial
If heater ID resistor value read is invalid, Status Code 26 will be displayed on STATUS LED.
If heater installed is equipped with a resistor connected to pins 1 and 2 of heater harness connector and status code 26 is displayed on
STATUS LED:
1.Check wiring harness connections to be sure connections are secure.
2.If symptoms persist, disconnect wiring harness at unit control board and check for a resistance value greater than 5000 ohms.
3.Check for proper wiring of resistor assembly.
4.Make sure heater size installed is an approved size for unit and size installed.
NOTE: Unit control will not operate electric heater until this Status Code is resolved. If the heater size is set through the User Interface, the heater will be operated as a single stage heater. If staging is desired, the IDR value must be read in by the unit control.
STATUS CODE 36, HEATER OUTPUT NOT SENSED WHEN ENERGIZED
Unit control is provided with circuitry to detect presence of a
If unit control energizes either heater stage and does not detect the
To find the fault:
1.Check for
NOTE: It may be useful as an electric heater troubleshooting procedure to disconnect the system communications to force Status Code 16 enabling of emergency heat mode. It is difficult to know which heater output is energized or not energized in normal operation. When unit is operated in emergency heat mode using electric heaters, both outputs are energized and
STATUS CODE 41, BLOWER MOTOR FAULT
If MOTOR LED is lit and flashing and motor does not run:
1.Check STATUS LED. If STATUS LED is indicating Status Code 41, motor control has detected that the motor will not come up to speed within 30 seconds of being commanded to run or that the motor has been slowed to below 250 rpm for more than 10 seconds after coming up to speed. Motor wiring harness and unit control are operating properly, do not replace.
2.Check to be sure that the blower wheel is not rubbing the housing.
3.Check motor to be sure that the motor shaft is not seized (motor control module must be removed and electronics disconnected from windings to perform this check properly).
4.Check motor windings section following instructions in Section C, ECM Motor Troubleshooting.
If all these checks are normal, the motor control module may need replacement.
STATUS CODE 16, SYSTEM COMMUNICATION FAULT
If, at any time, system communications are not successful for a period exceeding 2 minutes, the unit 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 on the amber STATUS LED (see section E, Emergency Heating and Cooling Modes). No further unit troubleshooting information will be available at the User Interface until communications are
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