Table - LED Status Codes
Status LED Status LED Description
Status
LED
Troubleshooting
Information
Green “POWER” Module has
p
o
wer
Supply voltage is present at module terminals
Red “TRIP” LED
On
S
ol
i
d
Thermostat demand signal Y is
present, but the compressor is not
r
unning.
1. Compressor protector is o
p
en
2. Condensing unit power disconnect is o
p
e
n
3. Compressor circuit breaker or fuse(s) is o
p
e
n
4. Broken supply wires or connector is not making con
ta
ct
5. Compressor power wires not routed through Comfort Alert
6. Compressor contactor has failed o
p
e
n
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
S
ol
i
d
A short circuit or over current
condition exists on PROT terminal.
1. Compressor contactor coil
s
horted
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,
d
a
m
a
g
ed
)
3. Condenser fan is not
r
unning
4. If low pressure switch is o
p
e
n
:
a. Low refrigerant charg
e
b. Evaporator blower is not
r
unning c. Evaporator coil
is frozen
d. Faulty metering device e. Condenser coil
is
d
irt
y
\
f. Liquid line restriction (filter drier blocked if present)
Yellow “ALERT”
Flash Code 3
Short
C
yclin
g
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
sh
or
t
---
cycling on thermostat
3. System or control board defective
Yellow “ALERT”
Flash Code 4
Locked Rotor
LOCKOUT
1. Low line voltage to comp
ressor
2.
Excessive
liquid refrigerant in com
p
re
sso
r
3. Compressor bearings are seized
Yellow “ALERT”
Flash Code 5
Open Circuit 1. Condensing unit power disconnect is o
p
e
n
2. Compressor circuit breaker or fuses are o
p
e
n
3. Compressor contactor has failed o
p
e
n
4. High pressure switch is open and requires manual reset
5. Broken supply wires or connector is not making con
ta
ct
6. Unusually long compressor protector reset time due to extreme ambient
temperature
7. Compressor windings are
d
a
m
a
g
e
d
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
d
a
m
a
g
ed
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
Compressor always runs
1. Compressor contactor has failed clo
se
d
2. Thermostat demand signal not connected to modul
e
Yellow “ALERT”
Flash Code 9
Low Voltage
Control circuit
<
18VAC
1. Control circuit transformer is o
v
er
loa
d
e
d
2. Low line voltage to comp
ressor
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