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Goodman GMS8 Series Technical Manual
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Goodman GMS8 Series Technical Manual

33-3/8" 80% gas furnace units 80% afue, single stage, multi-speed, upflow horizontal
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GMS8 33-3/8" 80% Gas Furnace Units
80% AFUE, Single Stage,
Multi-Speed, Upflow Horizontal
•
Refer to Service Manual RS6612006for troubleshooting information.
•
All safety information must be followed as provided in the Service Manual.
•
Refer to the appropriate Parts Catalog for part number information.
•
Model numbers listed on page 3.
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 performed by an unqualified
person.
Copyright © 2011, 2013 Goodman Manufacturing Company, L.P.
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RT6622014r3
November 2013

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Questions and answers

Nancy Dewhirst
April 15, 2025

The heater is running but not cooling. I see a constant red light through the round window.

0
1 comments:
Mr. Anderson
April 15, 2025

The Goodman GMS8 Series heater running but not cooling could be due to insufficient conditioned air passing over the heat exchanger. This may be caused by blocked filters, restrictive ductwork, or an incorrect circulator blower speed. A constant red light (4 LED flashes) indicates the primary limit circuit is open, which usually happens when the system overheats due to poor airflow.

Corrective actions include:
- Checking and cleaning or replacing filters
- Inspecting ductwork for blockages
- Verifying and correcting circulator blower speed

Power should be turned off before any repairs are made.

This answer is automatically generated

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Summary of Contents for Goodman GMS8 Series

  • Page 1 Model numbers listed on page 3. ® This manual is to be used by qualified, professionally trained HVAC technicians RT6622014r3 only. Goodman does not assume any responsibility for property damage or personal injury due to improper service procedures performed by an unqualified November 2013 person.
  • Page 2 Disconnect ALL power before servicing or installing this unit. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. Goodman will not be responsible Installation and repair of this unit WARNING WARNING...
  • Page 3 PRODUCT IDENTIFICATION The model and manufacturing number are used for positive identification of component parts used in manufacturing. Please use these numbers when requesting service or parts information. GMS80403A*B* GMS80403A*A* GMS80603A*B* GMS80603A*A* GMS80604B*B* GMS80604B*A* GMS80804B*B* GMS80804B*A* GMS80805C*B* GMS80805C*A* GMS81005C*B* GMS81005C*A* GMS81205D*B* GMS81205D*A *These models available in Natural Gas and Low NOx.
  • Page 4 PRODUCT DESIGN General Operation NFPA 54/ANSI Z223.1 - latest edition. In Canada, the fur- naces must be vented in accordance with the National Stan- The GMS8 furnaces are equipped with an electronic ignition dard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 - device used to light the burners and an induced draft blower latest editions and amendments.
  • Page 5 COMPONENT IDENTIFICATION Tubular Heat Exchanger Pressure Switch Flue Pipe Connection Induced Draft Blower Gas Line Entrance Gas Valve Rollout Limit Junction Box Wiring Harness Grommet Gas Manifold Gas Line Entrance (Alternate) Inshot Burner Transformer Circulator Blower Blower Door Interlock Switch Note: Primary Limit Not Shown Integrated Control Module Upflow/Horizontal...
  • Page 6 PRODUCT DIMENSIONS GMS8 Alt. Gas Inlet Alt. Gas Inlet Alt. High Voltage High Voltage Inlet Low Voltage Alt. LowVoltage MODEL GMS80403A*** 12 - 1/2 GMS80603A*** GMS80604B*** 17 - 1/2 GMS80804B*** GMS80805C*** 19 - 1/2 GMS81005C*** GMS81205D*** 24 - 1/2...
  • Page 7 PRODUCT DESIGN GMS8***A* Pressure Switch Trip Points Trip Point ID B lower ID B lower Pressure Model Pressure Switch Swi tch Part # -0. 70 B1370158 GMS80403A*A* GMS80603A*A* -0. 70 B1370158 -0. 75 B1370179 GMS80604B*A* GMS80804B*A* -0. 75 B1370179 -0. 75 B1370179 GMS80805C*A* -0.
  • Page 8 PRODUCT DIMENSIONS GMS8***B* Pressure Switch Trip Points Trip Point ID Blower ID Blower Pressure Model Pressure Switch Switch Part # GMS80403A*B* -0.80 0130F00042 GMS80603A*B* -0.80 0130F00042 GMS80604B*B* -0.90 0130F00041 GMS80804B*B* -0.80 0130F00042 GMS80805C*B* -0.80 0130F00042 GMS81005C*B* -0.80 0130F00042 GMS81205D*B* -0.80 0130F00042 For installations in Canada, the GMS furnaces are certifed only to 4,500 ft.
  • Page 9 These coils are available in both cased and uncased models (with the option of field installed TXV expansion device). ® These 80% furnaces match up with the existing Amana brand coils as shown below. Coil Matches (for Goodman ® units using R22 and R-410A): 1824...
  • Page 10 PRODUCT DESIGN Thermostats: It is recommended that a single-stage heat, non-power robbing thermostat be used. Refer to the product marketing literature for a complete list of thermostats offered. Filters: Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or CAN/ULCS111 standards.
  • Page 11 FURNACE SPECIFICATIONS GMS8***A* MODEL Btuh Input (US) High Fire 45,000 70,000 70,000 90,000 90,000 115,000 140,000 Output (US) High Fire 36,000 56,000 56,000 72,000 72,000 92,000 112,000 A.F.U.E. Rated External Static (" w.c.) .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50...
  • Page 12 FURNACE SPECIFICATIONS GMS8***B* MODEL Btuh Input (US) High Fire 40,000 60,000 60,000 80,000 80,000 100,000 120,000 Output (US) High Fire 32,000 48,000 48,000 64,000 64,000 80,000 96,000 A.F.U.E. Rated External Static (" w.c.) .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50...
  • Page 13 BLOWER PERFORMANCE SPECIFICATIONS GMS8***A* (CFM & Temperature Rise vs. External Static Pressure) EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model Motor at 0.5" Heating Speed Speed As Shipped CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM HIGH 1521 1466...
  • Page 14 BLOWER PERFORMANCE SPECIFICATIONS GMS8***B* (CFM & Temperature Rise vs. External Static Pressure) EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model Motor at 0.5" Heating Speed Speed As Shipped CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM HIGH 1521 ----...
  • Page 15 BLOWER PERFORMANCE SPECIFICATIONS...
  • Page 16 WIRING DIAGRAMS GMS8 Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.
  • Page 17 SCHEMATICS GMS8 HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. CIRCULATOR BLOWER INDUCER HEAT COOL PARK PARK ROLLOUT SWITCH XFMR 24 VAC XFMR...

This manual is also suitable for:

Gms80403a a seriesGms80603a a seriesGms80604b a seriesGms80804b a seriesGms80805c a seriesGms81005c a series ... Show all