Nordyne Outdoor Heat Pump Two Stage Split System R-410A User Manual
Page 17
17
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
Y is present, but
compressor is not
running
•
Compressor protector is open
•
Check for high head pressure
•
Check compressor supply voltage
•
Outdoor unit power disconnect is open
•
Compressor circuit breaker or fuse(s) is open
•
Broken wire or connector is not making contact
•
Low pressure switch open if present in system
•
Compressor contactor has failed open
Yellow “ALERT”
Flash Code 1
Long Run Time
Compressor is
running extremely
long run cycles
•
Low refrigerant charge
•
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 control board
—
Check thermostat wiring for open circuit
•
Evaporator coil is frozen
—
Check for low suction pressure
—
Check for excessively low thermostat setting
—
Check evaporator airfl ow (coil blockages or return airfi lter)
—
Check ductwork or registers for blockage
•
Faulty metering device
—
Check TXV bulb installation (size, location and contact)
—
Check if TXV/fi xed orifi ce is stuck closed or defective
•
Condenser coil is dirty
•
Liquid line restriction (fi lter drier blocked if present in system)
•
Thermostat is malfunctioning
—
Solenoid plug not connected
—
Y2 not wired at Comfort Alert
—
Check thermostat sub-base or wiring for short circuit
—
Check thermostat installation (location, level)
•
Comfort Alert failure
Yellow “ALERT”
Flash Code 2
System Pressure
Trip
•
High head pressure
—
Check high pressure switch if present in system
—
Check if system is overcharged with refrigerant
—
Check for non-condensable in system
Discharge or
suction
•
Condenser coil poor air circulation (dirty, blocked, damaged)
pressure out of
limits
•
Condenser fan is not running
—
Check fan capacitor
—
Check fan wiring and connectors
—
Check fan motor for failure or blockage
compressor
overloaded
•
Return air duct has substantial leakage
•
If low pressure switch present in system, check Flash Code
1 information
TROUBLESHOOTING
Table 4. LED Diagnostics