16
Flash Codes
LED Status
Fault Description
Troubleshooting Information
Power (Green)
Module has power.
■
Supply voltage is present at module terminals.
Trip (Red)
Thermostat demand signal Y1 is
present, but the compressor is
not running.
■
Compressor protector is open.
■
Outdoor unit power disconnect is open.
■
Compressor circuit breaker or fuse(s) is open.
■
Broken wire or connector is not making contact.
■
Low pressure switch is open, if present in system.
■
Compressor contactor has failed to open.
Alert (Yellow) Flash Code 1
Long Run Time: Compressor is
running extremely long run
cycles.
NOTE: Not applicable on heat pump models.
Alert (Yellow) Flash Code 2
System Pressure Trip: Discharge
or suction pressure out of limits
or compressor is overloaded.
■
High head pressure.
■
Condenser coil has poor air circulation (dirty, blocked, damaged).
■
Condenser fan is not running.
■
Return air duct has substantial leakage.
■
If low pressure switch is present in the system, go to Flash
Code 1 information.
Alert (Yellow) Flash Code 3
Short Cycling: Compressor is
running only briefly.
■
Thermostat demand signal is intermittent.
■
Time delay relay or control board is defective.
■
If high pressure switch is present, go to Flash Code 2 information.
■
If low pressure switch is present, go to Flash Code 1 information.
Alert (Yellow) Flash Code 4
Locked Rotor
■
Run capacitor has failed.
■
Low line voltage (contact utility if voltage at disconnect is low).
■
Excessive liquid refrigerant in the compressor.
■
Compressor bearings are seized.
Alert (Yellow) Flash Code 5
Open circuit
■
Outdoor unit power disconnect is open.
■
Compressor circuit breaker or fuse(s) is open.
■
Compressor contactor has failed to open.
■
High pressure switch is open and requires manual reset.
■
Open circuit in the compressor supply wiring or connections.
■
Unusually long compressor protector reset time due to the
extreme ambient temperature.
■
Compressor windings are damaged.
Alert (Yellow) Flash Code 6
Open Start Circuit: Current only
in run circuit.
■
Run capacitor has failed.
■
Open circuit in the compressor start wiring or connections.
■
Compressor start winding is damaged.
Alert (Yellow) Flash Code 7
NOTE: This code will
flash within 5 minutes of
power interruption until the
5 minute short cycle timer has
elapsed. Allow at least
5 minutes of run time before
confirming this code.
Open Run Circuit: Current only
in start circuit
■
Open circuit in the compressor run wiring or connections.
■
Compressor run winding is damaged.
Alert (Yellow) Flash Code 8
Welded Contactor: Compressor
always runs.
■
Compressor contactor has failed to close.
■
Thermostat demand signal not connected to the module.
Alert (Yellow) Flash Code 9
Low Voltage: Control circuit less
than 17 VAC
■
Control circuit transformer is overloaded.
■
Low line voltage (contact utility if voltage at disconnect is low).
