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STATUS LED
Green "POWER"
Red "TRIP" LED On Solid
Red "TRIP" LED Flashing
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
Yellow "ALERT" Flash Code 2
Yellow "ALERT" Flash Code 3
Yellow "ALERT" Flash Code 4
Yellow "ALERT" Flash Code 5
Yellow "ALERT" Flash Code 6
Yellow "ALERT" Flash Code 7
Yellow "ALERT" Flash Code 8
Yellow "ALERT" Flash Code 9
CHS-180-240-01SI Rev. A
Table 14 — LED Status Codes
STATUS LED DESCRIPTION
Module has power
Thermostat demand signal Y is present, but the
compressor is not running.
The anti-short cycle timer (3 minutes), in module is preventing compressor restart.
A short circuit or over current condition exists on
PROT terminal.
System Pressure Trip Discharge pressure out of
limits or compressor overload (if no high
pressure switch in system) LOCKOUT
Short Cycling Compressor is running only briefly
LOCKOUT
Locked Rotor LOCKOUT
Open Circuit
Missing Phase LOCKOUT
Reverse Phase LOCKOUT
Welded Contactor Compressor always runs
Low Voltage Control circuit < 18VAC
Specifications subject to change without notice.
STATUS LED
TROUBLESHOOTING INFORMATION
Supply voltage is present at module terminals
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
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
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
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
1. Low line voltage to compressor
2. Excessive liquid refrigerant in compressor
3. Compressor bearings are seized
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
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
1. Compressor running backward due to supply phase
reversal
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
1. Control circuit transformer is overloaded
2. Low line voltage to compressor
29
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