Nordyne 16 SEER User's Manual & Installation Instructions page 15

Status
LED
Green
"POWER"
Red "TRIP"
Yellow "ALE RT"
Flash Code 1
Yellow "ALE RT"
Flash Code 2
TROUBLESHOOTING
Status LED
Description
Module has
power
Thermostat
demand signal
Y is present, but
compressor is not
running
Long Run Time
Compressor is
running extremely
long run cycles
System
Pressure Trip
- Discharge or
suction pressure
out of limits or
compressor
overloaded
Status LED Troubleshooting information
Supply voltage is present at module terminals
, 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
, 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 airflow (coil blockages or return airfilter)
-- Check ductwork or registers for blockage
• Faulty metering device
-- Check TXV bulb installation (size, location and contact)
-- Check if TXV/fixed orifice is stuck closed or defective
, Condenser coil is dirty
, Liquid line restriction (filter 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
, High head
-- Check
-- Check
-- Check
pressure
high pressure switch if present in system
if system is overcharged with refrigerant
for non-condensable in system
, Condenser coil poor air circulation (dirty, blocked, damaged)
, Condenser fan is not running
-- Check fan capacitor
-- Check fan wiring and connectors
-- Check fan motor for failure or blockage
, Return air duct has substantial leakage
, If low pressure switch present in system, check Flash Code
1 information
Table 4. LED Diagnostics
15