Goodman GCES80 Series

Questions and Answers

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Latasha GreenAug 12, 2025
What to do if Goodman GCES80 Furnace LED is flashing 1 time?
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  Brandon PowellAug 12, 2025
  If your Goodman Furnace fails to operate and the integrated control module diagnostic LED is flashing once, it indicates a furnace lockout due to excessive ignition retries. This can be caused by a gas interruption. You should locate and correct the gas interruption. Also check the front cover pressure switch operation, including the hose, wiring, and contact operation, and correct if necessary. Other possible solutions include replacing or realigning the igniter, checking the flame sense signal (sanding the sensor if coated or oxidized), checking the flue piping for blockage, proper length, elbows, and termination, and verifying proper induced draft blower performance.
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Joshua RodriguezAug 16, 2025
How to troubleshoot Goodman Furnace with no LED signal?
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  Jason PeckAug 16, 2025
  If your Goodman furnace fails to operate and the integrated control module diagnostic LED provides no signal, ensure that there is 115 and 24 volt power to the furnace integrated control module. Check the integrated control module fuse (3A) and replace it if necessary. Check for possible shorts in the 115 and 24 volt circuits and repair as needed. A faulty integrated control module may also be the cause, so replace it if necessary. The cause may be a manual disconnect switch being OFF, door switch open, or 24 volt wires improperly connected or loose, or a blown fuse or circuit breaker.
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Mr. Dustin Malone Jr.Aug 19, 2025
What does 6 flashes mean on a Goodman Furnace?
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  Julia JonesAug 20, 2025
  If your Goodman furnace fails to operate and the integrated control module diagnostic LED is flashing six times, it could be due to flame rollout. Check the burners for proper alignment. Also, check the flue and air inlet piping for blockage, proper length, elbows, and termination, and correct as necessary. Check the rollout limit and replace it if necessary. Ensure the induced draft blower is performing properly, and replace it if necessary. The problem may also be due to misaligned burners, a blocked flue and/or air inlet pipe, or a failed induced draft blower. Check and correct any loose or improperly connected wiring. A short in the 24 volt AC control circuits or safety circuits, or a faulty rollout limit can also cause this issue. Tighten or correct any wiring connections.
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Glen PollardAug 23, 2025
Goodman GCES80 flashes 8 times, what does it mean?
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  Michael PhillipsAug 23, 2025
  If your Goodman furnace is not operating and the integrated control module diagnostic LED is flashing eight times, check and correct the wiring from the integrated control module to the igniter. Replace the igniter if it is bad. Check and correct the unit ground wire. If the issue persists, replace the integrated control module. This may be caused by an improperly connected igniter, a bad igniter, a poor unit ground, a poor burner ground, or a faulty integrated control module.
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Samantha SuttonAug 27, 2025
What does 2 flashes mean on a Goodman GCES80 Furnace?
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  Jack BestAug 27, 2025
  If your Goodman furnace fails to operate and the integrated control module diagnostic LED is flashing twice, it could be due to induced draft blower pressure switch contacts sticking. In this case, replace the induced draft blower pressure switch. It could also be caused by shorts in the pressure switch circuit, which would require repairing the short.
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Geoffrey HubbardAug 31, 2025
Goodman Furnace flashes 11 times, what does it mean?
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  Ebony BarnesAug 31, 2025
  If your Goodman furnace is not operating and the integrated control module diagnostic LED is flashing eleven times, check and correct the wiring from the integrated control module to the igniter. Replace the igniter if it is bad. Also, check and correct the unit ground wire. This issue may arise from an improperly connected igniter, a bad igniter, or a poor unit ground, or a poor burner ground.
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Michael TaylorSep 3, 2025
Goodman GCES80 Furnace flashes 12 times, what should I do?
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  Jasmine ZhangSep 3, 2025
  If your Goodman furnace is not operating and the integrated control module diagnostic LED is flashing twelve times, check and correct the wiring from the integrated control module to the inducer. Also, check for any blockage in the inducer and in the vent, and replace the inducer if necessary. Check and correct the unit ground wire. If the problem persists, replace the integrated control module. The cause may be improperly connected inducer, a bad inducer, a poor unit ground, or a faulty integrated control module.
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Scott JacksonSep 7, 2025
How to fix Goodman GCES80 LED flashing continuously?
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  Stephanie GutierrezSep 8, 2025
  If your Goodman furnace fails to operate and the integrated control module diagnostic LED is flashing continuously, review the wiring diagram to correct the polarity. Reverse the orange and gray wires going to the transformer. Verify proper ground. This issue arises when the polarity of the 115 or 24 volt power is reversed.

Summary

Important Information

Important Notices for Consumers and Servicers

Key notices for users and service personnel regarding safe operation.

Carbon Monoxide Poisoning Hazard

Details the risks and precautions associated with carbon monoxide.

Product Identification

Nomenclature and Model Identification

Explains the model number structure for identifying furnace components.

System Operation

Normal Operation Sequences

Describes the standard heating, cooling, and fan-only operational cycles.

Abnormal Operation

Discusses common furnace malfunctions and their probable causes.

Combustion and Ventilation Air Requirements

Outlines the necessary airflow for safe and proper furnace combustion.

Gas Supply and Piping

Details requirements for connecting and maintaining the gas supply to the furnace.

Scheduled Maintenance

Annual Inspection

Provides a checklist for yearly furnace inspection to ensure proper function.

Filter Maintenance

Explains the importance and procedure for cleaning or replacing air filters.

Burner Checks

Guides on visually inspecting burner flames for proper ignition and combustion.

Servicing

Checking Transformer Phasing and Polarization

Explains how to test transformer primary and secondary voltage phasing for proper operation.

Electrical Component Testing

Details procedures for testing voltage, wiring, thermostat, and control boards.

Blower and Airflow Checks

Covers checks for blower motor operation, duct static, and temperature rise.

Gas System and Pressure Checks

Outlines procedures for checking gas pressure, valve operation, and orifices.

Wiring Diagrams

Typical Schematic (MES80; CES80 Model Furnaces)

Provides a general wiring schematic for the specified furnace models.

Control Board Wiring Diagram

Details the wiring connections for the integrated control board and components.

Goodman GCES80 Series Specifications

General

Model	GCES80 Series
AFUE	80%
Stages	Single Stage
Vent Type	Category I
Fuel Type	Natural Gas
Heat Exchanger	Aluminized Steel
Thermostat Compatibility	Standard
Warranty	Limited Lifetime Heat Exchanger, 10-year Parts