SERVICING
27
Air Handler Troubleshooting Matrix (Continued)
Symptoms of Abnormal Operation Diagnostic / Status
LED Codes
Fault Description
Possible Causes
Corrective Actions
Blower Motor Operating in Power
Motor operational
parameters exceeded
Power fluctuation
Replace motor
Blower Motor Current Trip or Lost
Rotor
Motor will not rotate
Excessive motor current draw
Replace motor
Blower Motor Locked Rotor
Motor will not rotate
Motor not running
Replace motor
Over/Under Voltage Trip
Motor Line Voltage
Line voltage to motor out of range Verify motor line voltage Replace
motor
Incomplete Parameter sent to Motor
Noise on motor
communication line
Corrupted data in motor
communications
Power cycle system Replace motor
Inadequate Airflow
Less than expected airflow Blower motor running too slow
Replace motor
ClimateTalk Network
Communications
No ClimateTalk
communications
Broken or disconnected
ClimateTalk wiring
Check ClimateTalk communications
wiring
Coil Temperature Sensor Open
No coil temperature
Sensor not connected or broken
wire
Check if coil sensor is connected
Replace coil sensor
Coil Temperature Sensor Shorted
No coil temperature
Faulty sensor
Replace coil sensor
Check if suction sensor is connected
Replace suction sensor
Suction Temperature Sensor Shorted
No suction temperature
Faulty sensor
Replace Suction sensor
No EEV
communications
Liquid Thermistor Open or Shorted
No coil temperature
Sensor not connected or broken
wire
Check coil (liquid) sensor is connected,
if no connect, if yes replace
Gas Temperature sensor Open or
Shorted
No suction temperature
Sensor not connected or broken
wire
Check suction (gas) sensor is
connected, if no connect, if yes replace
Check if sensor is connected
If connected, replace sensor, may also
need to replace air handler board
Check EEV connection at air handler
Pressure Sensor Open or Shorted
No indoor pressure reading Sensor not connected or broken
wire
Suction Temperature Sensor Open
No suction temperature
Sensor not connected or broken
wire
EEV not connected
EEV not connected, broken wire
