Goodman furnace troubleshooting

Goodman Manufacturing is an American company specializing in air conditioning and heating systems. It has been part of Daiking since 2012. Goodman’s history began in 1954, when Harold V. Goodman started to work as an air conditioning contractor. However, it wasn’t until 1975 that he became involved in HVAC manufacturing. Goodman bought manufacturing equipment from a company that was about to close, which allowed him to become a high-quality, low-cost producer of air conditioners and heat pumps.
If your Goodman furnace won’t run, if it is too noisy, there is not enough heat, or you notice any other unusual symptoms, use the table below for quick help. First determine the symptom as accurately as possible, then check it in the list below. There can be several possible causes, and, therefore, more than one possible solution.

Symptoms of Abnormal OperationAssociated LED Code2Fault Description(s)Possible CausesCorrective ActionCautions and Notes
• Furnace fails to operate.NONE•No 115 volt power to furnace, or no 24volt power to integrated control module.• Manual disconnect switch OFF. door switch open, or 24 volt wires improperly connected or loose.•Assure 115 and 24 volt power to furnace integrated control module.•Turn power OFF nor to repair.
• Integrated control module diagnostic LED provides no signal.• Blown fuse or circuit breaker.• Blown fuse or circuit breaker.• Check integrated control module fuse (3A).• Replace integrate control module fuse with 3Aautomotive fuse.
• Integrated control module has an internal fault.• Integrated control module has an internal fault.Replace if necessary.• Read precautions in “Electrostatic Discharge* section of manual.
• Check for possible shorts in 115 and 24 volt circuits. Repair as necessary.
• Replace bad integrated control module.
• LED is Steady On.CONTINUOUS ON• Normal Operation• Normal Operation•None• Normal Operation
• Furnace fails to operate.1 FLASH• Furnace lockout due to an excessive number of ignition retries'(3 total)’.• Failure to establish flame. Cause may be no gas to burners, front cover pressure switch stuck open, bad igniter or igniter alignment, improper orifices, or coated/oxidized or improperly connected flame sensor.• Locate and correct gas interruption.•Turn power OFF prior to repair.
• Integrated control module diagnostic LED is flashing ONE (1) flash.• Loss of flame after establishment. Cause maybe interrupted gas supply, lazy burner flames(improper gas pressure or restriction in flue and/or combustion air piping), front cover pressure switch opening, or improper induced draft blower performance.• Check front cover pressure switch operation (hose, wiring, contact operation).Correct if necessary.• Igniter is fragile, handle with care.
• Replace or realign igniter.• Sand flame sensor with emery cloth.
• Check flame sense signal. Sand sensor if coated and/or oxidized.• See “Vent/Flue Pipe ‘section for piping details.
• Check flue piping for blockage, proper length, elbows, and termination.
• Verify proper induced draft blower performance.
• Furnace fails to operate.2 FLASHES• Pressure switch circuit is closed.•Induced draft blower pressure switch contacts sticking.• Replace induced draft blower pressure switch.•Turn power OFF nor to repair.
• Integrated control module diagnostic LED is flashing TWO (2) flashes.• Induced draft blower Is not operating.• Shorts in pressure switch circuit.•Repair short.• Replace pressure switch with proper replacement part.
• Induced draft blower runs continuously with no further furnace operation.3 FLASHES• Pressure switch circuit not closed.• Pressure switch hose blocked, pinched or connected improperly.• Inspect pressure switch hose. Repair, if necessary,•Turn power OFF prior to repair.
• Integrated control module diagnostic LED is flashing THREE (3)flashes.• Induced draft blowers operating.• Blocked flue and/or inlet air pipe, blocked drain system, or weak induced draft blower.• Inspect flue and/or inlet air piping for blockage, proper length, elbows, and termination. Check drain system. Correct as necessary.• Replace pressure switch with proper replacement part.
• Incorrect pressure switch set point or malfunctioning switch contacts.• Correct pressure switch setpoint or contact motion.
• Loose or improperly connected wiring.• Tighten or correct wiring connection.
• Circulator blower runs continuously. No furnace operation.4 FLASH• Primary or auxiliary limit circuit is open.• Faulty primary or auxiliary limit switch.• Check primary/auxiliary limit. Replace if necessary.•Turn power OFF prior to repair.
• Integrated control module diagnostic LED is flashing FOUR (4)flashes.• Insufficient conditioned air over the heat exchanger. Blocked filters, restnctiveductwork, improper circulator blower speed, or failed circulator blower.• Check filters and ductwork for blockage. Clean filters or remove obstruction.• Replace primary/auxiliary limit with proper replacement part.
• Loose or improperly connected wiring.• Check circulator blower speed and performance. Correct speed or replace blower if necessary.• Replace blower with correct replacement part.
• Tighten or correct wiring
• Induced draft blower and circulation blower runs continuously. No furnace operation.
• Integrated control module diagnostic LED is flashing FIVE (5)
5 FLASH• Flame sensed with no call for heat.• Short to ground in flame sense circuit.• Correct short at flame sensor or in flame sensor wiring.•Turn power OFF prior to repair.
• Circulator blower runs continuously. No furnace operation.6 FLASH• Rollout limit circuit is open.• Flame rollout.• Check burners for proper alignment.•Turn power OFF prior to repair.
• Integrated control module diagnostic LED is flashing SIX (6)flashes.• Misaligned burners, blocked flue and/or air inlet pipe, or failed induced draft blower.• Check flue and air inlet piping for blockage, proper length, elbows, and termination.• See *Vent/Fluepipe" section for piping details.
• Loose or improperly connected wiring.Correct as necessary.• Replace rollout limit with correct replacement part.
• Faulty rollout limit.• Check rollout limit. Replace if necessary.• Replace induced draft blower with correct replacement part.
• Check induced draft blower for proper performance. Replace, if necessary.
• Tighten or correct wiring connection.
• Normal furnace operation.7 FLASH• Flame sense microamp signal is low.• Flame sensor is coated/oxidized.• Sand flame sensor if coated/oxidized.•Turn power OFF prior to repair.
• Integrated control module diagnostic LED is flashing SEVEN (7)flashes.• Flame sensor incorrectly positioned in burner flame.• Inspect for proper sensor alignment.• Sand flame sensor with emery clot.
• Lazy burner flame due to improper gas pressure or combustion air.• Check inlet air piping for blockage, proper length, elbows, and termination.• See *Vent/Fluepipe" section for piping details.
• Compare current gas pressure to rating plate info. Adjust as needed.• See rating plate for proper gas pressure.
• Furnace fails to operate.CONTINUOUS ON• Polanty of 115 or 24volt power is reversed.• Polarity of 115 volt AC power to furnace or integrated control module is reversed.• Review wiring diagram to correct polanty.•Turn power OFF prior to repair.
• Integrated control module diagnostic LED is flashing continuously.• Orange and gray wires to transformer are reversed.• Reverse orange and gray wires going to transformer.
• Poor unit ground.• Verify proper ground. Correct if necessary.

Error codes and troubleshooting