Nordyne 14 SEER User's Information And Installation Instructions Manual page 9

StatusLED Status LED Description " Status L ED Troubleshooting Information
Green "POWER" Module h aspower Supply v oltage ispresent at module t erminals
Red "TRmP"
Yellow "ALERT"
Flash Code 7
Thermostat demand s ignal
Yispresent, butthe
compressor isnot
running
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
B.
7.
B.
9.
1.
2.
3.
4.
5.
Long Rue Time
Cornpressor is
running e xtremely
longruncycles
System Pressure T rip
Discharge or suction
pressure o utoflimitsOF
cornpressor overloaded
Short Cydiog
Compressor is running
onlybriefly
Looked R otor
Opec Circuit
Opec Start C imnit
Current onlyinruncircuit
Opec Rne Cironit
Current onlyinstart c ircuit
Cornpressor protector isopen
Outdoor unitpower disconnect isopen
Compressor circuitbreaker or fuse(s)is open
Broken wireorconnector isnotmaking contact
Lowpressure s witch open if present insystern
Compressor contactor has failed open
Lowrefrigerant charge
Evaporator blower i snotrunning
Evaporator coilisfrozen
Faulty metering device
Condenser coilisdirty
Liquidlinerestriction (filterdrierblocked if present insystern)
Thermostat ismalfunctioning
Comfort Alert F ailure
Comfort Alert F ailure
Highhead pressure
Condenser c oil poor air circulation(dirty, blocked,damaged)
Condenser fanisnotrunning
Return air ducthassubstantial leakage
Iflowpressure s witch present i nsystem, c heck Flash
Code 1information
1.Thermostat demand s ignal isintermittent
2.Time delay relayorcontrol b oard defective
3.If high pressure s witch present gotoFlash Code 2information
4.If lowpressure s witch present goto Flash Code 1information
1. Runcapacitor hasfailed
2. Lowlinevoltage (contact u tilityif voltage a tdisconnect is low)
• Checkwiring connections
3. Excessive liquidrefrigerant incompressor
4. Compressor bearings a reseized
• Ideasure c ompressor oillevel
1. Outdoor unitpower disconnect isopen
2, Compressor circuitbreaker or fuse(s)is open
3.Compressor contactor has failed open
• Check c ompressor contactorwiring andconnectors
• Checkfor c ompressor contactorfailure (burned, pittedor
open)
• Check w iring andconnectors between s upply and
compressor
• Check f orlowpilot v oltage atcompressor contactor coil
4, Highpressure switch isopen andrequires m anual reset
5. Open circuit i ncompressor supply wiringor connections
6. Unusually longcornpressor protector reset t imedue to
extreme a mbient temperature
7. Compressorwindingsaredamaged
• Check c ompressor rnotor w inding resistance
2.
Ydlow"ALERT" Welded C oetador 1,
Flash Cede 8 Compressor always r uns 2.
YeIIow"ALERT" LowVoltage 1. Control circuit t ransforrner isoverloaded
Flash Cede 9 Central circuit < 17VAC 2. Lowlinevoltage (contact u tilityif voltage a tdisconnect is low)
• Checkwiring connections
1, Runcapacitor hasfailed
2. Open circuit i ncompressor start w iring or connections
• Checkwiring andconnectors between s upplyandthe
compressor"S"terminal
3. Compressor startwinding i sdamaged
• Check c ompressor motorwinding resistance
1. Open circuit i ncompressor runwiringor connections
• Check w iring andconnectors between s upply and the
compressor"R"termina!
Compressor runwinding isdamaged
• Check c ompressor motorwinding resistance
Compressor contactor h as failed closed
Thermostat demand s ignal n otconnected tomodule
Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated,
TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation,
Table 1. interpreting the Diagnostic LEDS