Nortek JS4BD-KA User Manual

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COMFORT ALERT TROUBLESHOOTING - CONTINUED
Table 10. LED Diagnostics - Continued
Status LED Status LED Description Status LED Troubleshooting Information
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
— Check wiring and connectors between supply and the compressor S
terminal
• Compressorstartwindingisdamaged
— Check compressor motor winding resistance
ALERT
Flash Code 7
(Yellow LED)
Open run circuit
Current only in start
circuit
• Opencircuitincompressorrunwiringorconnections
— Check wiring and connectors between supply and the compressor R
terminal
• Compressorrunwindingisdamaged
— Check compressor motor winding resistance
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.
Table 11. Module Wiring Troubleshooting
Miswired Module Indication Recommended Troubleshooting Action
Green LED is not on, module does not power up
• DetermineifbothR & C module terminals are connected.
• Verifyvoltageispresentatmodule’sR & C terminals.
Green LED intermittent, module powers up only when
compressor runs
• DetermineifR & Y terminals are wired in reverse.
• VerifymodulesR&Cterminalshaveaconstantsource.
Trip LED is on, but system and compressor check OK
• VerifyY terminal is connected to 24VAC at contactor coil.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
• Verify24VACispresentacrossY & C when thermostat demand signal is
preset. If not, R & C are reversed wired.
TRIP LED & ALERT LED flashing together • VerifyR & C terminals are supplied with 19 - 28VAC.
ALERT Flash CODE 3 displayed incorrectly
(Compressor short cycling)
• VerifyY terminal is connected to 24VAC at contactor coil.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
ALERT Flash Code 5, 6, or 7 displayed incorrectly
(Open Circuit, Open Start Circuit or Open Run Circuit)
• Verifythecompressorrunandstartwiresareroutedthroughthemodule’s
current sensing holes.
• VerifytheY terminal is connected to 24VAC at contactor coil.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
ALERT Flash Code 6 (Open Start Circuit) displayed for
Code 7 (Open Run Circuit) or vice-versa
• Verifythecompressorrunandstartwiresareroutedthroughthecorrect
module sensing holes.
ALERT Flash Code 8 displayed incorrectly (Welded
Contactor)
• Determineifmodule’sY terminal is connected.
• VerifyY terminal is connected to 24VAC at contactor coil.
• Verify24VACispresentacrossY & C when thermostat demand signal is
present. If not, R & C are reversed wired.
• Verifyvoltageatcontactorcoilfallsbelow0.5VACwhenoff.
• ReviewThermostatDemandWiring(page10)forY & C wiring.

Nortek JS4BD-KA Specifications

General

Brand	Nortek
Model	JS4BD-KA
Category	Air Conditioner
Language	English