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Goodman GMSS9 Series - User Manual

Goodman GMSS9 Series
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GMSS9*/GCSS9*/AMSS9*/ ACSS9*
Single Stage Gas Furnaces
and Accessories
RS6612012
August 2014
This manual is to be used by qualified, 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
unqualified person. The material in this manual does not supercede manufacturer's installation and operation instructions.
Copyright © 2014 Goodman Manufacturing Company, L.P.
Service Instructions
is a registered trademark of Maytag Corporation or its related companies
and is used under license to Goodman Company, L.P., Houston, TX. All rights reserved.

Table of Contents

Questions and Answers

  • T
    Tracy ThompsonJul 31, 2025
    What to do if my Goodman Furnace circulator blower runs continuously but there is no furnace operation?
    • C
      Cynthia VargasJul 31, 2025
      If your Goodman Furnace circulator blower runs continuously without furnace operation, it could be due to a faulty primary or auxiliary limit switch, which would need checking and potential replacement. Another cause could be insufficient conditioned air over the heat exchanger due to blocked filters, restrictive ductwork, improper circulator blower speed, or a failed circulator blower. Check filters and ductwork for blockage and clean filters or remove any obstructions. Also, check and tighten any loose or improperly connected wiring.
  • L
    Lisa GainesAug 15, 2025
    What to do if Goodman GMSS9 circulator blower runs continuously but there is no furnace operation?
    • J
      Jared WadeAug 15, 2025
      If the circulator blower in your Goodman furnace runs continuously without furnace operation, it could be due to flame rollout. Check the burners for proper alignment. It may also be caused by misaligned burners, a blocked flue and/or air inlet pipe, or a failed induced draft blower. Check the flue and air inlet piping for blockage, proper length, elbows, and termination, and correct as necessary. Loose or improperly connected wiring can also cause this issue; tighten or correct the wiring connection. Another cause could be a faulty rollout limit; check the rollout limit and replace it if necessary.

Summary

INSTALLATION CONSIDERATIONS

Safety, Application, and ESD Precautions

General safety, product application, and electrostatic discharge precautions.

Location Requirements and Clearances

Thermostat Requirements and Location

Gas Supply, Piping, and Conversions

Information on gas supply, piping, and conversion to propane or high altitude.

Electrical Connections and Wiring

Details on furnace electrical connections, wiring harness, and thermostat wiring.

SYSTEM OPERATION

Heating - Abnormal Operation

Troubleshooting abnormal heating operation based on diagnostic LED codes.

SERVICING

Service Numbers and Troubleshooting Guide

List of service procedures and a guide for diagnosing problems.

Voltage, Wiring, and Transformer Checks

Motor, Duct, and Temperature Checks

Gas Pressure and Ignition Checks

Procedures for measuring gas pressure and checking ignition components.

Goodman GMSS9 Series Specifications

General IconGeneral
Efficiency RatingUp to 96% AFUE
ModelGMSS9
Heating Capacity40, 000 - 120, 000 BTU/h
Blower MotorMulti-Speed
Ignition TypeHot Surface Ignition
Warranty10-year Parts
StagesSingle-Stage
Fuel TypeNatural Gas or Propane
Gas TypeNatural Gas, Propane
Vent Diameter2, 3
Blower Motor TypeMulti-Speed

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