Installation Guide
17
COMFORT ALERT TROUBLESHOOTING
Table 10. LED Diagnostics
Status LED Status LED Description Status LED Troubleshooting Information
POWER
(Green LED)
Module has power Supply voltage is present at module terminals
TRIP
(Red LED)
Thermostat demand signal Y
is present, but compressor is
not running
• Compressorprotectorisopen
• Checkforhighheadpressure
• Checkcompressorsupplyvoltage
• Outdoorunitpowerdisconnectisopen
• Compressorcircuitbreakerorfuse(s)isopen
• Brokenwireorconnectorisnotmakingcontact
• Lowpressureswitchopenifpresentinsystem
• Compressorcontactorhasfailedopen
ALERT
Flash Code 1
(Yellow LED)
Long Run Time
Compressor is running
extremely long run cycles
• Lowrefrigerantcharge
• Evaporatorblowerisnotrunning
— 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
• Evaporatorcoilisfrozen
— 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
• Faultymeteringdevice
— CheckTXVbulbinstallation(size,locationandcontact)
— Check if TXV/fixed orifice is stuck closed or defective
• Condensercoilisdirty
• Liquidlinerestriction(lterdrierblockedifpresentinsystem)
• Thermostatismalfunctioning
— Solenoid plug not connected
— Y2 not wired at Comfort Alert
— Check thermostat sub-base or wiring for short circuit
— Check thermostat installation (location, level)
• ComfortAlertfailure
ALERT
Flash Code 2
(Yellow LED)
System Pressure Trip
• Highheadpressure
— Check high pressure switch if present in system
— Check if system is overcharged with refrigerant
— Check for non-condensable in system
Discharge or suction • Condensercoilpooraircirculation(dirty,blocked,damaged)
Pressure out of limits
• Condenserfanisnotrunning
— Check fan capacitor
— Check fan wiring and connectors
— Check fan motor for failure or blockage
Compressor overloaded
• Returnairducthassubstantialleakage
• Iflowpressureswitchpresentinsystem,checkFlashCode1information
ALERT
Flash Code 3
(Yellow LED)
Short Cycling / Compressor is
running only briefly
• Thermostatdemandsignalisintermittent
• Lowlinevoltage(contactutilityifvoltageatdisconnectislow)
• Excessiveliquidrefrigerantincompressor
• Compressorbearingsareseized
ALERT
Flash Code 4
(Yellow LED)
Locked Rotor
• Runcapacitorhasfailed
• Lowlinevoltage(contactutitlityifvoltageatdisconnectislow)
• Checkwiringconnections
• Excessiveliquidrefrigerantincompressor
• Compressorbearingsareseized
• Measurecompressoroillevel
ALERT
Flash Code 5
(Yellow LED)
Open Circuit
• Outdoorunitpowerdisconnectisopen
• Compressorcircuitbreakerorfuse(s)isopen
• Compressorcontactorhasfailedopen
— Check compressor contactor wiring and connectors
— Check for compressor contactor failure (burned, pitted or open)
— Check wiring and connectors between supply and compressor
— Check for low pilot voltage at compressor contactor coil
— High pressure switch is open and requires manual reset
• Opencircuitincompressorsupplywiringorconnections
• Unusuallylongcompressorprotectorresettimeduetoextremeambienttemperature
• Compressorwindingsaredamaged
— Check compressor motor winding resistance