23
Status leD
Status leD Description
Status leD Troubleshooting information
Yellow
“ALERT”
Flash Code
3
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
Yellow
“ALERT”
Flash Code
4
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
Yellow
“ALERT”
Flash Code
5
Open Circuit
•
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
— 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
Yellow
“ALERT”
Flash Code
6
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
Yellow
“ALERT”
Flash Code
7
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
Yellow
“ALERT”
Flash Code
8
Welded Contactor
Compressor always runs
•
Compressor contactor has failed closed
•
Thermostat demand signal not connected to module
Yellow
“ALERT”
Flash Code
9
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 8. leD Diagnostics - continued
