9
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
A short circuit or over
current 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 or compressor over-
loaded (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*
*Code 3 lockout
is disabled for
543-0071-00
Short Cycling
Compressor is running only
briefl y 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 (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
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 protec-
tor reset time due to extreme ambient
temperature
7. Compressor windings are damaged
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