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Table 8 – 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
compressor is not running.
1. Compressor protector is open
2. Condensing unit p ower disconnect is open
3. Compressorcircuitbreakerorfuse(s)isopen
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” L ED
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 curren t
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
Discharge pressure out of
limits LOCKOUT
1. High head pressure
2. Condenser coil poor air circulation (dirty , blocked, damaged)
3. C ondenser fan is not running
4. 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)
Yellow “ALERT”
Flash Code 3
Short Cycling
Compressor is running only
briefly (four consecutive
cycles of less than three
minutes each)
LOCKOUT
1. Loose connection between thermostat Y1 and CADM Y terminal.
2. Unit short---cycling on thermostat
3. 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 p ower disconnect is open
2. Compressorcircuitbreakerorfusesareopen
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. Compressorfuseisopenononephase
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 P hase
LOCKOUT
1. C ompressor running backward due to supply phase reversal
Yellow “ALERT”
Flash Code 8
Welded Contactor
Compressor 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 < 18V AC
1. Control circuit transformer is overloaded
2. Low line voltage to compressor
38AU
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