INSTALLATION INSTRUCTIONS
R
−
410A Split System Air Conditioner
421 01 5103 00
17
Figure 16
Comfort Alert
t
Diagnostics (some models)
Status LED
Status LED Description
Status LED Troubleshooting Information
Green “POWER”
Module has power
Supply voltage is present at module terminals
Red “TRIP”
Thermostat demand signal
Y1 is present, but the
compressor is not running
1. Compressor protector is open
2. Outdoor unit power disconnect is open
3. Compressor circuit breaker or fuse(s) is open
4. Broken wire or connector is not making contact
5. Low pressure switch open if present in system
6. Compressor contactor has failed open
Yellow “ALERT”
Flash Code
1
Long Run Time
Compressor is running
extremely long run cycles
1. Low refrigerant charge
2. Evaporator blower is not running
3. Evaporator coil is frozen
4. Faulty metering device
5. Condenser coil is dirty
6. Liquid line restriction (filter drier blocked if present in system)
7. Thermostat is malfunctioning
Yellow “ALERT”
Flash Code
2
System Pressure Trip
Discharge or suction
pressure out of limits or
compressor overloaded
1. High head pressure
2. Condenser coil poor air circulation (dirty, blocked, damaged)
3. Condenser fan is not running
4. Return air duct has substantial leakage
Yellow “ALERT”
Flash Code
3
Short Cycling
Compressor is running
only briefly
1. If high pressure switch open, go to Flash Code 2 information
2. If low pressure switch open, go to Flash Code 1 information
3. Thermostat demand signal is intermittent
4. Loose wiring at contactor coil
Yellow “ALERT”
Flash Code
4
Locked Rotor
1. Run capacitor has failed
2. Low line voltage (contact utility if voltage at disconnect is low)
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
Yellow “ALERT”
Flash Code
5
Open Circuit
1. Outdoor unit power disconnect is open
2. Compressor circuit breaker or fuse(s) is open
3. Compressor contactor has failed open
4. High pressure switch is open and requires manual reset
5. Open circuit in compressor supply wiring or connections
6. Unusually long compressor protector reset time due to
extreme ambient temperature
7. Compressor windings are damaged
Yellow “ALERT”
Flash Code
6
Open Start Circuit
Current only in run circuit
1. Run capacitor has failed
2. Open circuit in compressor start wiring or connections
3. Compressor start winding is damaged
Yellow “ALERT”
Flash Code
7
Open Run Circuit
Current only in start circuit
1. Open circuit in compressor run wiring or connections
2. Compressor run winding is damaged
Yellow “ALERT”
Flash Code
9
Low Voltage
Control circuit < 17VAC
1. Control circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect is low)
S
Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated.
S
TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.
