27
Table 9 – LED Status Codes
Status LED
Status LED Description
Status LED Troubleshooting Information
Green “POWER” Module has power
Supply voltage is present at module terminals
Red “TRIP”
LED On Solid
Thermostat demand signal
Y is present, but the com-
pressor is not running.
1. Compressor protector is open
2. Condensing unit power disconnect is open
3. Compressor circuit breaker or fuse(s) is open
4. Broken supply wires or connector is not making contact
5. Compressor power wires not routed through Comfort Alert
6. Compressor contactor has failed open
Red “TRIP” LED
Flashing
The anti-short cycle timer (3 minutes), in module is preventing compressor restart.
Module locks out compressor when compressor damaging ALERT code appears.
Lockout ALERT codes are noted in the Status LED Description.
During a compressor lock out, 24VAC power must be removed from module to manually reset.
Yellow “ALERT”
LED On Solid
A short circuit or over cur-
rent condition exists on
PROT terminal.
1. Compressor contactor coil shorted
2. Electrical load too high for PROT circuit (maximum 1 Amp)
3. 24 V AC wired directly to PROT terminal
Yellow “ALERT”
Flash Code 2
System Pressure Trip Dis-
charge pressure out of lim-
its or compressor overload
(if no high pressure switch
in system)
LOCKOUT
1. High head pressure
2. Condenser coil poor air circulation (dirty, blocked, damaged)
3. Condenser fan is not running
4. If low pressure switch is open: Refer to Code 3 for troubleshooting
Yellow “ALERT”
Flash Code 3
Short Cycling
Compressor is running only
briefly LOCKOUT
1. If low pressure switch is open:
a. Low refrigerant charge
b. Evaporator blower is not running
c. Evaporator coil is frozen
d. Faulty metering device
e. Condenser coil is dirty
f.
Liquid line restriction (filter drier blocked if present)
2. If high pressure switch is open, go to Flash Code 2 information
3. Intermittent thermostat demand signal
4. System or control board defective
Yellow “ALERT”
Flash Code 4
Locked Rotor
LOCKOUT
1. Low line voltage to compressor
2. Excessive liquid refrigerant in compressor
3. Compressor bearings are seized
Yellow “ALERT”
Flash Code 5
Open Circuit
1. Condensing unit power disconnect is open
2. Compressor circuit breaker or fuses are open
3. Compressor contactor has failed open
4. High pressure switch is open and requires manual reset
5. Broken supply wires or connector is not making contact
6. Unusually long compressor protector reset time due to extreme
ambient temperature
7. Compressor windings are damaged
Yellow “ALERT”
Flash Code 6
Missing Phase
LOCKOUT
1. Compressor fuse is open on one phase
2. Broken wire or connector on one phase
3. Compressor motor winding is damaged
4. Utility supply has dropped one phase
Yellow “ALERT”
Flash Code 7
Reverse Phase
LOCKOUT
1. Compressor running backward due to supply phase reversal
Yellow “ALERT”
Flash Code 8
Welded Contactor Com-
pressor always runs
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
Yellow “ALERT”
Flash Code 9
Low Voltage
Control circuit < 18VAC
1. Control circuit transformer is overloaded
2. Low line voltage to compressor
38A
U
D
Summary of Contents for 38AUD*12 Series
Page 21: ...21 Fig 19 38AUZ 07 Charging Chart Fig 20 38AUZ 08 Charging Chart...
Page 22: ...22 Fig 21 38AUD 12 Charging Chart...
Page 23: ...23 Fig 22 38AUD 14 Charging Chart...
Page 24: ...24 Fig 23 Typical 38AUZ Wiring Diagram 50Hz Single Circuit Unit Shown...
Page 25: ...25 Fig 24 Typical 38AUD Wiring Diagram 50Hz Dual Circuit Unit Shown...
Page 61: ...21 C10084 Fig 18 Typical 38AUD 16 Wiring Diagram 38AUD...
Page 62: ...22 C10085 Fig 19 Typical 38AUD 25 Wiring Diagram 38AUD...