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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.
STATUS LED
Green "POWER"
Red "TRIP" LED On Solid
Red "TRIP" LED Flashing
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
Yellow "ALERT" Flash Code 2
Yellow "ALERT" Flash Code 3
Yellow "ALERT" Flash Code 4 Locked Rotor LOCKOUT
Yellow "ALERT" Flash Code 5 Open Circuit
Yellow "ALERT" Flash Code 6 Missing Phase LOCKOUT
Yellow "ALERT" Flash Code 7 Reverse Phase LOCKOUT
Yellow "ALERT" Flash Code 8
Yellow "ALERT" Flash Code 9
Table 19 — LED Status Codes
STATUS LED DESCRIPTION
Module has power
Supply voltage is present at module terminals
1. Compressor protector is open
2. Condensing unit power disconnect is open
Thermostat demand signal
3. Compressor circuit breaker or fuse(s) is open
Y is present, but the
4. Broken supply wires or connector is not making contact
compressor is not running.
5. Compressor power wires not routed through Comfort Alert
6. Compressor contactor has failed open
The anti-short cycle timer (3 minutes) in module is preventing compressor restart.
A short circuit or over
1. Compressor contactor coil shorted
current condition exists on
2. Electrical load too high for PROT circuit (maximum 1 Amp)
PROT terminal.
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:
System Pressure Trip
a. Low refrigerant charge
Discharge pressure out of
b. Evaporator blower is not running
limits LOCKOUT
c. Evaporator coil is frozen
d. Faulty metering device
e. Condenser coil is dirty
f. Liquid line restriction (filter drier blocked if present)
Short Cycling Compressor
is running only briefly (four
1. Loose connection between thermostat Y1 and CADM Y terminal.
consecutive cycles of less
2. Unit short-cycling on thermostat
than three minutes each)
3. System or control board defective
LOCKOUT
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 protector reset time due to extreme ambient temperature
7. Compressor windings are damaged
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
1. Compressor running backward due to supply phase reversal
Welded Contractor
1. Compressor contactor has failed closed
Compressor always runs
2. Thermostat demand signal not connected to module
Low Voltage Control circuit
1. Control circuit transformer is overloaded
< 18VAC
2. Low line voltage to compressor
STATUS LED TROUBLESHOOTING INFORMATION
34
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