21
FIGURE 7
COMFORT ALERT DIAGNOSTICS TROUBLESHOOTING CHART
Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated.
TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.
Run Time Over 18 Hours
Compressor is
running extremely
long run cycles
System Pressure Trip
Discharge pressure out of
limits or compressor
overloaded
Status LED
Green “POWER”
Red “TRIP”
Yellow “ALERT”
Flash Code 1
Yellow “ALERT”
Flash Code 2
Module has power
Thermostat demand signal
Y1 is present, but the
compressor is not
running
1
.
Compressor internal protector is open
• Check for high head pressure
• Check compressor supply voltage
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
6
.
Compressor contactor has failed open
1
.
Condenser coil poor air circulation (dirty, blocked, damaged)
2
.
Condenser fan is not running
• Check fan capacitor
• Check fan wiring and connectors
• Check fan motor for failure or blockage
3.
Return air duct has substantial leakage
1
.
Low refrigerant charge
2
.
Evaporator blower is not running
• Check blower relay coil and contacts
• Check blower motor capacitor
• Check blower motor for failure or blockage
• Check evaporator blower wiring and connectors
• Check indoor blower interface board
• Check thermostat wiring for open circuit
3.
Evaporator coil is frozen
• Check for low suction pressure
• Check for excessively low thermostat setting
• Check evaporator airflow (coil blockages or return air filter)
• Check ductwork or registers for blockage
4
.
Faulty metering device
• Check TXV bulb installation (size, location and contact)
• Check if TXV is stuck closed or defective
5.
Evaporator coil is dirty
6
.
Liquid line restriction (filter drier blocked if present in system)
7
.
Thermostat is malfunctioning
• Check thermostat sub-base or wiring for short circuit
• Check thermostat installation (location, level)
Supply voltage is present at module terminals
Status LED Description
Status LED Troubleshooting Information
Summary of Contents for ARL Series
Page 28: ...28 FIGURE 8 ARL 024 ARL 036 ARL 048 WIRING DIAGRAM ...
Page 29: ...29 FIGURE 9 ASL 036 WIRING DIAGRAM ...
Page 30: ...30 FIGURE 10 ARL 060 WIRING DIAGRAM ...
Page 31: ...31 ...
Page 32: ...32 CM 1005 ...
