Installation guide

12
Table 1. Interpreting the Diagnostic LEDS
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
•Evaporatorcoilisfrozen
•Faultymeteringdevice
•Condensercoilisdirty
•Liquidlinerestriction(lterdrierblockedifpresentinsystem)
•Thermostatismalfunctioning
•ComfortAlertfailure
ALERT
Flash Code 2
(Yellow LED)
System Pressure Trip
•Highheadpressure
Discharge or suction •Condensercoilpooraircirculation(dirty,blocked,damaged)
Pressure out of limits •Condenserfanisnotrunning
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
•Opencircuitincompressorsupplywiringorconnections
•Unusually long compressor protector reset timedueto extreme
ambient temperature
•Compressorwindingsaredamaged
ALERT
Flash Code 6
(Yellow LED)
Open Start Circuit
Current only in run
circuit
•Runcapacitorhasfailed
•Opencircuitincompressorstartwiringorconnections
•Compressorstartwindingisdamaged
ALERT
Flash Code 7
(Yellow LED)
Open run circuit
Current only in start
circuit
•Opencircuitincompressorrunwiringorconnections
•Compressorrunwindingisdamaged
ALERT
Flash Code 8
(Yellow LED)
Welded Contactor
Compressor always
runs
•Compressorcontactorhasfailedclosed
•Thermostatdemandsignalnotconnectedtomodule
ALERT
Flash Code 9
(Yellow LED)
Low Voltage
Control circuit <
17VAC
•Controlcircuittransformerisoverloaded
•Lowlinevoltage(contactutilityifvoltageatdisconnectislow)
•Checkwiringconnections
* Flash code number corresponds to a number of LED flashes, followed by a pause and then repeated. Trip and alert LED’s
flashing at same time means control circuit voltage is too low for operation.