Goodman air conditioner troubleshooting

While selecting the Goodman brand, you can be sure that you’ll get a refreshingly affordable product that’s covered by the high- grade product warranties in the air conditioning industry. It is assured by the Goodman air conditioner troubleshooting system, which helps to reveal any case of malfunctions and determine all correct ways of repairs. Not without reason, Goodman is considered the leading brand in the residential and light commercial heating, ventilation and air conditioning industry.

Goodman air conditioner Servicing Diagnostics Table

Status LEDStatus LED DescriptionStatus LED Troubleshooting Information
Green "POWER"Module has powerSupply voltage is present at module terminals
Red "TRIP"Thermostat demand signal
Y1 is present, but the
compressor is not
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
5. If low pressure switch present in system,
check Flash Code 1 information
Yellow "ALERT"
Flash Code 3
Short Cycling
Compressor is running
only briefly
1. Thermostat demand signal is intermittent
2. Time delay relay or control board defective
3. If high pressure switch present go to Flash Code 2 information
4. If low pressure switch present go to Flash Code 1 information
Yellow "ALERT"
Flash Code 4
Locked Rotor1. 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 Circuit1. 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 8
Welded Contactor
Compressor always runs
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
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)

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.
Reset ALERT Flash code by removing 24VAC power from module
Last ALERT Flash code is displayed for 1 minute after module is powered

Goodman air conditioner troubleshooting

SymptomFault DescriptionPossible Causes
Corrective Action
Motor rocks slightly when startingThis Is normal star Mip for variable speed motor--
Motor Won't start.- No movement
Manual disconnect switch off or doorswitch open.
Blown fuse or circuit breaker
24 Vac wires miswired
Unseated pins in wiring harness connectors
Bad motor/control module.
Moisture present in motor or control module.
Check 230 Vac power at motor.
C nee* low voltage (24 Vac R to C) at motor.
Check low voltage connections
(G,V. W. H C) at motor
Check for unseated pins in connectors
on motor harness
Test with a temporary jumper between R - G
Motor rocks, but won't start.Loose motor mount
Blower wheel not tight on motor shaft
Bad motorvconirol module
Check for loose or compliant motor mount
- Make sure blower wheel is tight on shaft
- Perform motor/control replacement check ECM only.
Motor oscillates up and down while being tested off of blower.It is normal for motorto oscillate with no load on shaft.--
Motor starts, but runs erraticallyVaries up and dawn or intermittent
Variation in 230 Vac to motor.
Unseated pins in wiling harness connectors.
Erratic CFM command from "BK" terminal
I mproper thermostat connection or setting
Moisture oresent in motor/control module
Check line voltage for variation or “sag”
- Check low voltage connections (G, Y, W, R, C) at motor, unseated pins in motor harness connectors
- Check “Bk” GE ICM2 for erratic CFM command (in variable speed applications)
- Check-out system controls
- Tʼstat?
- Perform Moisture Check
“Hunts” or “puffs” at high CFM (speed) Incorrect or duty filter(s). Incorrect supply or return ductwork Incorrect blower speed setting Does removing panel or filter reduce “puffi ng”?
- Reduce restriction
- Reduce max airflow
Stays at low CFM despite system call for cool or heat CFM 24 Vac wires miswired or loose. 'R' missing/not connected at motor. Fan in delay mode Check low voltage (Thermostat wires and connectons
Verify fan is not in delay mode -wait until delay complete
Perform molor/control replacement check, ECM motors only.
Stays at high CFM R missing/not connected at motor
Is fan in delay mode? - wait until delay time complete
Perform motor/control replacement check
Blower won’t shut off Current leakage from controls into G, Y or W?Check for Triac switched t'stat or solid-state relay
Excessive noiseAir noise High static creating high blower speed?
- Is airflow set properly?
- Does removing filter cause blower to slow down? Check filter
- Use low-pressure drop filter
- Check/correct duct restrictions
Noisy blower or cabinet- Check for loose blower housing, panels, etc.
- High static creating high blower speed?
- Check for air whistling through seams in ducts, cabinets or panels
- Check for cabinet/duct deformation
Hunts or puffs at high CFM (speed) - Does removing panel or filter reduce “puffing”?
- Reduce restriction
- Reduce max. airflow
Evidence of Moisture Motor failure or malfunction has occurred
and moisture is present
Moisture in motor/control module Replace motor and perform Moisture Check