Kelvinator JS4BD030KB Installation Guide download pdf (Page 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

• 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

ALERT

Flash Code 1

(Yellow LED)

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(lter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

ALERT

Flash Code 2

(Yellow LED)

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

ALERT

Flash Code 3

(Yellow LED)

Short Cycling / Compressor is

running only brieﬂy

• Thermostatdemandsignalisintermittent

• Lowlinevoltage(contactutilityifvoltageatdisconnectislow)

• Excessiveliquidrefrigerantincompressor

• Compressorbearingsareseized

ALERT

Flash Code 4

(Yellow LED)

Locked Rotor

• Runcapacitorhasfailed

• Lowlinevoltage(contactutitlityifvoltageatdisconnectislow)

• Checkwiringconnections

• Excessiveliquidrefrigerantincompressor

• Compressorbearingsareseized

• Measurecompressoroillevel

ALERT

Flash Code 5

(Yellow LED)

Open Circuit

• Outdoorunitpowerdisconnectisopen

• Compressorcircuitbreakerorfuse(s)isopen

• Compressorcontactorhasfailedopen

— 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

• Opencircuitincompressorsupplywiringorconnections

• Unusuallylongcompressorprotectorresettimeduetoextremeambienttemperature

• Compressorwindingsaredamaged

— Check compressor motor winding resistance

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Kelvinator JS4BD030KB Installation Guide Page 17

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