Nordyne R-410A Installation And User Manual page 16

Status LED
Status LED
Description
Short Cycling
Yellow "ALERT" Compressor is
Flash Code 3 running only
briefl y
Yellow "ALERT"
Locked Rotor
Flash Code 4
Yellow "ALERT"
Open Circuit
Flash Code 5
Open Start
Yellow "ALERT" Circuit
Flash Code 6 Current only in
run circuit
Open run circuit
Yellow "ALERT"
Current only in
Flash Code 7
start circuit
Welded
Yellow "ALERT" Contactor
Flash Code 8 Compressor
always runs
Low Voltage
Yellow "ALERT"
Control circuit
Flash Code 9
< 17VAC
* Flash code number corresponds to a number of LED fl ashes, followed by a pause and then
repeated. Trip and alert LED's fl ashing at same time means control circuit voltage is too low for
operation.
16
TROUBLESHOOTING - CONTINUED
Status LED Troubleshooting Information
•
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
•
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
• 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
— C
heck 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 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
•
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
•
Compressor contactor has failed closed
• Thermostat demand signal not connected to module
•
Control circuit transformer is overloaded
•
Low line voltage (contact utility if voltage at disconnect is low)
•
Check wiring connections
Table 4. LED Diagnostics - Continued