Goodman GMES80 Series User Manual

Goodman GMES80 Series

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Service and Troubleshooting





Copyright © 2019-2020 Goodman Manufacturing Company, L.P.

This manual is to be used by qualied, professionally

trained HVAC technicians only. Goodman does not assume

any responsibility for property damage or personal injury

due to improper service procedures or services performed

by an unqualied person.

RS6621003r3

April 2020

®

is a registered trademark of Maytag Corporation or its related companies and is used under license.

All rights reserved.

TABLE OF CONTENTS

IMPORTANT INFORMATION ............................................ 2

PRODUCT IDENTIFICATION ........................................... 4

SYSTEM OPERATION ...................................................... 6

SCHEDULED MAINTENANCE ....................................... 25

SERVICING ..................................................................... 27

ACESSORIES ................................................................. 45

TROUBLESHOOTING CHART ....................................... 48

WIRING DIAGRAMS ....................................................... 51

Pride and workmanship go into every product to provide

our customers with quality products. It is possible, however,

that during its lifetime a product may require service.

Products should be serviced only by a qualied service

technician who is familiar with the safety procedures

required in the repair and who is equipped with the proper

tools, parts, testing instruments and the appropriate service

manual. 

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

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Cancer and Reproductive Harm -

www.P65Warnings.ca.gov

0140M00517-A

Table of Contents

Questions and Answers:

C
cindy76Aug 14, 2025
What to do if Goodman Furnace LED is flashing 1 time?
- S
  Stephanie MeyerAug 14, 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.
A
Alvin SnyderAug 17, 2025
How to troubleshoot Goodman GMES80 with no LED signal?
- T
  Terri HallAug 17, 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.
B
Brandon ThomasAug 21, 2025
What does 6 flashes mean on a Goodman GMES80?
- C
  Cassandra MartinezAug 21, 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.
E
Elizabeth PhillipsAug 25, 2025
Goodman GMES80 Furnace flashes 8 times, what does it mean?
- A
  andrew59Aug 26, 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.
V
Vincent CooperAug 28, 2025
What does 2 flashes mean on a Goodman GMES80 Furnace?
- N
  nicole35Aug 29, 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.
W
walterkatieSep 1, 2025
Goodman GMES80 Furnace flashes 11 times, what does it mean?
- J
  Jacqueline Macdonald DDSSep 1, 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.
D
dianemcdanielSep 5, 2025
Goodman GMES80 Furnace flashes 12 times, what should I do?
- H
  holtcynthiaSep 5, 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.
M
michael28Sep 9, 2025
How to fix Goodman GMES80 Furnace LED flashing continuously?
- B
  Brandon WongSep 9, 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.

Goodman GMES80 Series Specifications

General

Model	GMES80 Series
Type	Gas Furnace
Efficiency Rating	80% AFUE
Blower Motor	Multi-Speed
Ignition Type	Hot Surface Ignition
Heat Exchanger	Aluminized Steel
Cabinet	Heavy-Gauge Steel
Venting	Category I
Motor Type	PSC
Stages	Single-Stage
Fuel Type	Natural Gas or Propane
Warranty	Limited Lifetime Heat Exchanger, 10-Year Parts Limited Warranty

Summary

Service and Troubleshooting

IMPORTANT INFORMATION

CARBON MONOXIDE POISONING HAZARD

PRODUCT IDENTIFICATION

SYSTEM OPERATION

HEATING - Abnormal Operation

Safety

COMBUSTION AND VENTILATION AIR REQUIREMENTS

9.3* Air for Combustion and Ventilation.

Category I Venting (Vertical Venting)

Check 1 - Proper chimney termination.

Propane Gas and/or High Altitude Installations

PROPANE GAS CONVERSION

ELECTRICAL CONNECTIONS

THERMOSTAT WIRING - SINGLE-STAGE

SCHEDULED MAINTENANCE

ANNUAL INSPECTION

HEATING PERFORMANCE TEST

SERVICING

S-1 CHECKING VOLTAGE

Procedure for testing electrical voltage supply to furnace components.

CHECKING FOR PHASING - PRIMARY TO SECONDARY OF UNMARKED TRANSFORMERS*

Method for checking transformer phasing to ensure proper operation and prevent damage.

S-200 CHECKING DUCT STATIC

Procedure for measuring static pressure in ductwork to ensure proper airflow.

S-300 CHECKING PRIMARY LIMIT CONTROL

Steps to test the primary limit control for proper operation and safety.

S-301 CHECKING AUXILIARY LIMIT CONTROL

Procedure for testing the auxiliary limit control's functionality and safety.

S-303 INDUCED DRAFT BLOWER MOTOR

Diagnostic steps for checking the induced draft blower motor for faults.

S-307 CHECKING GAS PRESSURE

Method for measuring and adjusting gas supply and manifold pressures.

Gas Manifold Pressure Measurement and Adjustment

S-308 CHECKING HOT SURFACE IGNITOR

Procedure for testing the hot surface ignitor's resistance and functionality.

S-310 CHECKING PRESSURE SWITCH

Diagnostic steps for testing the pressure switch operation and setpoints.

S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS

Troubleshooting integrated ignition control boards for proper operation and fault codes.

S-314 CHECKING FLAME SENSOR

Procedure for testing the flame sensor for proper installation and signal output.

WIRING DIAGRAMS

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