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non- communicating outdoor unit and the R, C, Y, O, W outdoor
unit terminal strip connections and will display Status Code 16,
System Communication Fault,onamberSTATUSLED.No
further fan coil troubleshooting information will be available at
user interface until communications are re- established.
If COMM LED does not light within proper time period and Status
Code is not displayed:
1. Check system transformer high and low voltage to be sure
the system is powered.
2. Check fuse on fan coil control 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 disp layed:
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. Mis- wiring or shorting of the ABCD communications
wiring will not allow successful communications.
NOTE: Shorting or mis- wiring low voltage system wiring will
not cause damage to fan coil control or user interface but may
cause low voltage fuse to open.
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
designed- in LED information aids and follow troubleshooting
steps described below before replacing motor Control Module or
entire motor. Motor Control Module is available as a replacement
part.
VERIFY MOTOR WINDING SECTION:
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or possible equipment damage.
After disconnecting power from the ECM motor, wait at least
5 minutes before removing the control section. Internal
capacitors require time to discharge.
!
WARNING
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 re-
placed.
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 ex-
ists.
2. Recheck airflow and system static pressure using user inter-
face service screens with access panel in place.
NOTE: Blower motor faults will not cause a lockout of blower
operation. Fan coil control will attempt to run the blower motor as
long as user interface maintains a demand for airflow. Fan coil
control will not operate electric heaters while a fault condition
exists. The fan coil control communicates with the motor at least
once every 5 seconds, even when the motor is idle. If, during
operation, the fan coil 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 fan coil control
microprocessor and the STATUS LED to provide fan coil
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, Fan Coil
Troubleshooting.
E. Fan Coil Troubleshooting
Fan coil 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:
Fan coil control has failed internal start- up tests and must be
replaced. No other service procedure will correct.
STATUS CODE 37 , HEATER OUTPUT SENSED “ON”
WHEN NOT ENERGIZED:
Fan coil control is provided with circuitry to detect presence of a
24VAC signal on Electric Heater stage 1 and stage 2 outputs. If fan
coil control detects a 24VAC signal on either heater stage output
and it is not supplying signal, Status Code 37 will be displayed on
STATUS LED. Fan coil control will turn off output and command
blower motor to supply an airflow determined to be safe for current
operation mode with electric heaters energized.
To find the fault:
1. Stop all system operations at User Interface and check heat-
er stage 24VAC outputs.
2. Disconnect electric heater at plug/receptacle 2 and check
heater wiring for faults. See Status Code 36 for more infor-
mation.
STATUS CODE 44, MOTOR COMMUNICATION FAULT:
The MOTOR LED is connected to the blower motor
communication line and works with the fan coil control
microprocessor and STATUS LED to provide fan coil 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.
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.
Fan coil control is constantly communicating with the motor, even
when the motor and MOTOR LED are o ff. 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:
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