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Table 20 — LED Status Codes
Table 21 — CADM Troubleshooting
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 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
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 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 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:
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 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
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 damaged
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 Contractor
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
< 18VAC
1. Control circuit transformer is overloaded
2. Low line voltage to compressor
MISWIRED MODULE INDICATION
RECOMMENDED TROUBLESHOOTING ACTION
Green LED is not on,
module does not power up
Determine if both R and C module terminals are connected. Verify voltage in present at module’s R and C
terminals.
NOTE: The CADM requires a constant nominal 24VAC power supply. The wiring to the module’s R and C
terminals must be directly from the control transformer. The module cannot receive its power from another
device that will interrupt the 24VAC power supply. See Appendix B Wiring Diagrams.
Green LED Intermittent,
module powers up only
when compressor runs
Determine if R and Y terminals are wired in reverse. Verify module’s R and C terminals have a constant
source. See “NOTE” above for details on R and C wiring.
TRIP LED is on but system
and compressor check OK
Verify Y terminal is wired properly per the 569J wiring diagram (see Appendix B Wiring Diagrams). Verify
voltage at contactor coil falls below 0.5VAC when off. Verify 24VAC is present across Y and C when
thermostat demand signal is present. If not, R and C are reverse wired.
TRIP LED and ALERT LED
flashing together
Verify R and C terminals are supplied with 19-28VAC.
ALERT Flash Code 3
(Compressor Short Cycling)
displayed incorrectly
Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below
0.5VAC when off.
ALERT Flash Code 5 or 6
(Open Circuit, Missing Phase)
displayed incorrectly
Check that compressor T1 and T3 wires are through module’s current sensing holes. Verify Y terminal is
connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off.
Alert Flash Code 8
(Welded Contactor)
displayed incorrectly
Determine if module’s Y terminal is connected. Verify Y terminal is connected to 24VAC at contactor coil.
Verify 24VAC is present across Y and C when thermostat demand signal is present. If not, R and C are
reverse wired. Verify voltage at contactor coil falls below 0.5VAC when off.