35
TROUBLESHOOTING THE CADM WIRING
Flashing LEDs also indicate wiring problems to the CADM. See
Tables 19 and 20 for discussion of additional LED flash codes and
troubleshooting instructions.
Table 19 — LED Status Codes
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
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