Trou Bleshooti Ng Tables - Nordyne 16 SEER User's Manual & Installation Instructions

TROUBLESHOOTING - CONTINUED
Status LED
Status LED Description Status LED Troub[eshooting information
Short Cycling = Thermostat demand signal is intermittent
Yellow "ALERT" Compressor is , Low line voltage (contact utility if voltage at disconnect is low)
Flash Code 3 running only = Excessive liquid refrigerant in compressor
briefly = Compressor bead ngs are seized
= Run capacitor has failed
= Low line voltage (contact utitlity if voltage at disconnect is
Yellow "ALE RT" low)
Locked Rotor = Check wiring connections
Flash Code 4
= Excessive liquid refrigerant in compressor
= Compressor bearings are seized
= Measure compressor oil level
= 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
Yellow "ALE RT"
Flash Code 5 Open Circuit 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
= Run capacitor has failed
Open Start = Open circuit in compressor start wiring or connections
YeIIow"ALERT" Circuit -- Check wiring and connectors between supply and the
Flash Code 6 Current only in compressor S terminal
run circuit , Compressor start winding is damaged
-- Check compressor motor winding resistance
, Open circuit in compressor run wiring or connections
YeIIow"ALERT" Open run circuit -- Check wiring and connectors between supply and the
Current only in compressor R terminal
Flash Code 7
start circuit = Compressor run winding is damaged
-- Check compressor motor winding resistance
Welded
YeIIow"ALERT" Contactor = Compressor contactor has failed closed
Flash Code 8 Compressor = Thermostat demand signal not connected to module
always runs
YeIIow"ALERT" LowVo[tage = Control circuit transformer is overloaded
Control circuit = Low line voltage (contact utility if voltage at disconnect is low)
Flash Code 9
< 17VAC = 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 4. LED Diagnostics - Continued
16