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Module locks out compressor when compressor damaging ALERT codes appear
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*
*Code 3 lockout
is disabled for
543-0071-00
Yellow "ALERT"
Flash Code 4
Yellow "ALERT"
Flash Code 5
A short circuit or over
current condition exists on
PROT terminal.
System Pressure Trip
Discharge pressure out of
limits or compressor over-
loaded (if no high pressure
switch in system)
LOCKOUT
Short Cycling
Compressor is running only
briefl y LOCKOUT
Locked Rotor
LOCKOUT
Open Circuit
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 (fi lter 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 protec-
tor reset time due to extreme ambient
temperature
7. Compressor windings are damaged
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