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XPG20 SERIES
Status LED
Condition
Status LED Troubleshooting Information
Status LED Description
Yellow Flash Code 2
System Pressure Trip
−
Discharge or suction pressure
out of limits or compressor
overloaded
1
High head pressure.
S
Check high pressure switch if present in system
S
Check if system is overcharged with refrigerant
S
Check for non−condensable in system
2
Condenser coil poor air circulation (dirty, blocked, damaged).
3
Condenser fan is not running.
S
Check fan capacitor
S
Check fan wiring and connectors
S
Check fan motor for failure or blockage
4
Return air duct has substantial leakage.
Yellow Flash Code 3
Short Cycling
− Compressor is
running only briefly
1
Thermostat demand signal is intermittent.
2
Time delay relay or control board is defective.
3
If high pressure switch is present, see Flash Code 2 information.
Yellow Flash Code 4
Locked Rotor
1
Run capacitor has failed.
2
Low line voltage (contact utility if voltage at disconnect is low).
S
Check wiring connections
3
Excessive liquid refrigerant in the compressor.
4
Compressor bearings are seized.
Yellow Flash Code 5
Open Circuit
1
Outdoor unit power disconnect is open.
2
Unit circuit breaker or fuse(s) is open.
3
Unit contactor has failed to close.
S
Check compressor contactor wiring and connectors
S
Check for compressor contactor failure (burned, pitted or open)
S
Check wiring and connectors between supply and compressor
S
Check for low pilot voltage at compressor contactor coil
4
High pressure switch is open and requires manual reset.
5
Open circuit in compressor supply wiring or connections.
6
Unusually long compressor protector reset time due to extreme ambient tempera-
ture.
7
Compressor windings are damaged.
S
Check compressor motor winding resistance
Yellow Flash Code 6
Open Start Circuit
− Current
only in run circuit
1
Run capacitor has failed.
2
Open circuit in compressor start wiring or connections.
S
Check wiring and connectors between supply and the compressor S" terminal
3
Compressor start winding is damaged.
S
Check compressor motor winding resistance
Yellow Flash Code 7
Open Run Circuit
− Current
only in start circuit
1
Open circuit in compressor start wiring or connections.
S
Check wiring and connectors between supply and the compressor
R
terminal
2
Compressor start winding is damaged.
S
Check compressor motor winding resistance
Yellow Flash Code 8
Welded Contactor
−
Compressor always runs
1
Compressor contactor failed to open.
2
Thermostat demand signal not connected to module.
Yellow Flash Code 9
Low Voltage
− Control circuit
<17VAC
1
Control circuit transformer is overloaded
.
2
Low line voltage (contact utility if voltage at disconnect is low).
S
Check wiring connections
NOTE
Last code will display for 1 minute when power is cycled to module. Power must be on to module for a minimum of 1 minute for code to clear.
NOTE
Upon Y2 signal detection and after 5 seconds, the LSOM module will send 24 VAC to the solenoid. Once the solenoid is fully energized, the
LSOM module reduces voltage to between 4 to 18 VDC . Every 15 minutes the solenoid voltage will be increase to 24 volts for a few seconds to ensure
solenoid valve is engaged until Y2 signal is no longer present.
