22
Status
leD
Status leD Description
Status leD Troubleshooting information
Green
“POWER”
Module has power
Supply voltage is present at module terminals
Red “TRIP”
Thermostat demand signal Y
is present, but compressor is
not running
•
Compressor protector is open
•
Check for high head pressure
•
Check compressor supply voltage
•
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 open if present in system
•
Compressor contactor has failed open
Yellow
“ALERT”
Flash Code 1
Long Run Time Compressor
is running extremely long run
cycles
•
Low refrigerant charge
•
Evaporator blower is not running
— Check blower relay coil and contacts
— Check blower motor capacitor
— Check blower motor for failure or blockage
— Check evaporator blower wiring and connectors
— Check indoor blower control board
— Check thermostat wiring for open circuit
•
Evaporator coil is frozen
— Check for low suction pressure
— Check for excessively low thermostat setting
— Check evaporator airflow (coil blockages or return airfilter)
— Check ductwork or registers for blockage
•
Faulty metering device
— Check TXV bulb installation (size, location and contact)
— Check if TXV/fixed orifice is stuck closed or defective
•
Condenser coil is dirty
•
Liquid line restriction (filter drier blocked if present in system)
•
Thermostat is malfunctioning
— Solenoid plug not connected
— Y2 not wired at Comfort Alert
— Check thermostat sub-base or wiring for short circuit
— Check thermostat installation (location, level)
•
Comfort Alert failure
Yellow
“ALERT”
Flash Code 2
System Pressure Trip
•
High head pressure
— Check high pressure switch if present in system
— Check if system is overcharged with refrigerant
— Check for non-condensable in system
Discharge or suction
•
Condenser coil poor air circulation (dirty, blocked, damaged)
pressure out of limits
•
Condenser fan is not running
— Check fan capacitor
— Check fan wiring and connectors
— Check fan motor for failure or blockage
compressor overloaded
•
Return air duct has substantial leakage
•
If low pressure switch present in system, check Flash Code 1
information
Table 8. leD Diagnostics
TRoubleSHooTing
