Goodman Mfg GMS8, GDS8, GHS8 instruction manual Troubleshooting Chart

Page 29

TROUBLESHOOTING CHART

Symptoms of Abnormal

Associated

Fault Description(s)

Possible Causes

Corrective Action

Cautions and Notes

Operation

LED Code2

 

 

 

 

 

 

 

 

 

• Furnace fails to operate.

NONE

• No 115 volt power

• Manual disconnect switch

• Assure 115 and 24 volt

• Turn power OFF

• Integrated control

 

to furnace, or no 24

OFF, door switch open, or

power to furnace

prior to repair.

 

volt power to

24 volt wires improperly

integrated control

 

module diagnostic LED

 

 

 

integrated control

connected or loose.

module.

 

provides no signal.

 

 

 

module.

• Blown fuse or circuit

• Check integrated control

 

 

 

 

 

 

 

 

 

 

• Blown fuse or circuit

breaker.

module fuse (3A).

• Replace integrated

 

 

breaker.

 

Replace if necessary.

control module

 

 

 

 

• Check for possible shorts

fuse with 3A

 

 

 

 

automotive fuse.

 

 

 

 

in 115 and 24 volt

 

 

 

 

 

 

 

 

 

circuits. Repair as

 

 

 

 

 

necessary.

 

• Furnace fails to operate.

 

• Integrated control

• Integrated control module

• Replace bad integrated

• Turn power OFF

 

 

module has an

has an internal fault.

control module.

prior to repair.

 

 

internal fault.

 

 

• Read precautions

 

 

 

 

 

 

 

 

 

 

in “Electrostatic

 

 

 

 

 

Discharge” section

 

 

 

 

 

of manual.

• Furnace fails to operate.

 

• Furnace lockout due

• Failure to establish flame.

• Locate and correct

• Turn power OFF

• Integrated control

1

to an excessive

Cause may be no gas to

gas interruption.

prior to repair.

 

number of ignition

burners, bad igniter or

 

• Igniter is fragile,

module diagnostic LED

 

• Replace or realign

 

attempt (1 total) and

igniter alignment,

is flashing ONE (1)

1 FLASH

igniter.

handle with care.

“retries” (3 total)1.

improper orifices, or

flash.

 

• Auxiliary Limit Open

coated/oxidized or

• Check flame sense

• Clean flame

 

 

improperly connected

signal. Sand sensor if

sensor with steel

 

 

 

 

 

 

flame sensor.

coated and/or

wool.

 

 

 

• Loss of flame after

oxidized.

• See “Combustion

 

 

 

 

 

 

 

establishment. Cause may

• Check flue piping for

and Ventilation Air

 

 

 

be interrupted gas supply,

blockage, proper

Requirements” and

 

 

 

lazy burner flames

length, elbows, and

“Category I

 

 

 

(improper gas pressure or

termination.

Venting (Vertical

 

 

 

restriction in flue or

• Verify proper induced

Venting)” section

 

 

 

improper induced draft

for details.

 

 

 

blower performance.

draft blower

• See Product Data

 

 

 

• Insufficient conditioned air

performance.

 

 

 

• Check circulator

Bulletin for

 

 

 

over the heat exchanger.

allowable rise

 

 

 

Blocked filters, restrictive

blower speed and

range and proper

 

 

 

ductwork, improper

performance. Correct

circulator speed.

 

 

 

circulator blower speed, or

speed or replace

 

 

 

 

failed circulator blower.

blower if necessary.

 

 

 

 

 

 

 

• Furnace fails to operate.

 

• Pressure switch

• Induced draft blower

• Replace induced draft

• Turn power OFF

• Integrated control

2

circuit is closed.

pressure switch contacts

blower pressure

prior to repair.

 

 

sticking.

switch.

 

module diagnostic LED

 

• Induced draft blower

• Replace pressure

 

 

 

is flashing TWO (2)

2 FLASHES

is not operating.

• Shorts in pressure switch

• Repair short.

switch with proper

flashes.

 

 

circuit.

 

replacement part.

 

 

 

 

 

 

• Induced draft blower

 

• Pressure switch

• Pressure switch hose

• Inspect pressure

• Turn power OFF

runs continuously with

3

circuit not closed.

blocked, pinched or

switch hose. Repair, if

prior to repair.

no further furnace

• Induced draft blower

connected improperly.

necessary,

 

 

• See “Combustion

operation.

 

 

 

• Integrated control

3 FLASHES

is operating.

• Blocked flue or weak

• Inspect flue for

and Ventilation

 

 

induced draft blower.

blockage, proper

Air

module diagnostic LED

 

 

 

length, elbows, and

Requirements”

is flashing THREE (3)

 

 

 

 

 

 

termination.

and “Category I

flashes.

 

 

 

 

 

• Incorrect pressure switch

 

Venting (Vertical

 

 

 

• Correct pressure

 

 

 

setpoint or malfunctioning

Venting)” section

 

 

 

switch contacts.

switch setpoint or

for details.

 

 

 

• Loose or improperly

contact motion.

• Replace pressure

 

 

 

• Tighten or correct

 

 

 

connected wiring.

switch with proper

 

 

 

 

wiring connection.

replacement part.

1Integrated control module will automatically attempt to reset from lockout after one hour.

2LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.

IO-242C

29

05/05

 

 

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Page 28 Page 30
Contents Installation & Operating Table of Contents XIV. Safety Circuit Description XII. Start-up Procedure and AdjustmentXV. Troubleshooting XVI. MaintenanceTo the Installer II. SafetyHomeowner Notice To the OwnerAmerican National Standards Institute III. Product ApplicationNational Fire Protection Association CSA InternationalGeneral IV. Location Requirements and ConsiderationsNational Fire Protection Association, Inc Horizontal Installation Clearances and AccessibilitySuspended Furnace Existing Furnace RemovalEquipment Located in Unconfined Spaces Z223.1 Section GeneralThermostat Influences Equipment Located in Confined Spaces Space, UnconfinedVI. Category I Venting Vertical Venting Specially Engineered InstallationsLouvers and Grilles Model Minimum VentVII. Exterior Masonry Chimneys Category I Furnaces only Checklist SummaryUpflow Rotated Induced Draft Blower Typical Multiple Flue Clay Tile ChimneyCheck 1 Proper Chimney Termination Termination 10 Feet Or Less From Ridge, Wall or ParapetTermination More Than 10 Feet From Ridge, Wall or Parapet Check 7 Complete the Installation Check 4 Debris in CleanoutCheck 3 Chimney Crown Condition Check 5 Liner ConditionFIX 2 -CHANGE Venting Arrangements VIII. Electrical ConnectionsFIX 3 Rebuild the Crown FIX 4 ReliningIntegrated Ignition Control Wiring HarnessVolt Line Connections Fossil Fuiel ApplicationsVolt Thermostat Wiring Typical Field Wiring 24 VAC Control CircuitSetting the Heat Anticipator Heating Heating/Cooling Room ThermostatHigh Altitude Derate IX. GAS Supply and PipingTwinning 904BNA does not require a switch change Pressure Switch Changes Furnace input Kbtu/hrFiring Rate Propane GAS ConversionGAS Piping Connections General Upflow InstallationsGeneral Furnace Layout Counterflow Installations Propane Gas Installation TypPropane GAS Piping Charts GAS Piping ChecksDuctwork Air Circulating AIR and FiltersXI. Sequence of Operation Integrated Ignition Control White-Rodgers Model 36G22 XII. START-UP Procedure and AdjustmentWhite-Rodgers Model 36F22 Measuring Inlet Gas Pressure Alternate Method White-Rodgers Model 36G22GAS Supply Pressure Measurement WHITE-RODGERS 36F22 GAS ValveGAS Input Rate Measurement Natural GAS only GAS Manifold Pressure Measurement and AdjustmentXIII. Operational Checks Temperature Rise MeasurementAdjustment Switches Burner Flame XIV. Safety Circuit DescriptionXV. Troubleshooting XVI. Maintenance Igniter Qualified Servicer only Flame Sensor Qualified Servicer onlyUpright Filter Removal Induced Draft and Circulator Blower MotorsTroubleshooting Chart Continuously Wiring Diagram for GMS8/GDS8/GHS8 Are Subject to Change Without Notice
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GMS8, GHS8, GDS8 specifications

Goodman Manufacturing, a well-reputed name in the HVAC industry, offers a comprehensive range of heating and cooling solutions. Among their notable products are the GDS8, GHS8, and GMS8 series, each designed to meet diverse customer needs while providing exceptional performance and energy efficiency.

The Goodman GDS8 gas furnace is known for its remarkable efficiency and reliability. Boasting an AFUE (Annual Fuel Utilization Efficiency) rating of up to 80%, the GDS8 converts a significant portion of fuel into usable heat, ensuring lower energy bills for homeowners. This model features a multi-speed blower motor that optimizes airflow, enhancing temperature consistency throughout the home, and reducing noise levels during operation. The GDS8 comes equipped with a durable heat exchanger crafted from high-quality steel, ensuring longevity and optimal heat transfer.

On the other hand, the GHS8 series represents Goodman’s commitment to high-efficiency heating. With an AFUE rating of up to 96%, the GHS8 is engineered for maximum performance. Its two-stage heating system allows for better temperature control, enabling the furnace to operate quietly and efficiently. Another standout feature is the ComfortBridge technology, which enhances the system’s ability to communicate and adapt to the home’s specific heating needs. This feature optimizes energy usage and increases comfort levels in any environment.

The Goodman GMS8 model is an exceptional choice for homeowners looking for a reliable gas furnace with a focus on energy efficiency. Similar to its counterparts, the GMS8 also delivers an AFUE of up to 96.5%. This unit features an advanced modulating gas valve that adjusts heating output based on the temperature requirements, creating a consistent and comfortable indoor climate. The GMS8 is also equipped with a high-efficiency ECM blower motor, which reduces energy consumption while improving airflow.

All three models feature Goodman’s quality construction, including a heavy-gauge cabinet that minimizes noise and enhances durability. They also are backed by Goodman’s limited lifetime warranty on the heat exchanger and a 10-year limited warranty on parts, providing customers with peace of mind regarding their investment. These furnaces are designed with efficiency and comfort in mind, making the GDS8, GHS8, and GMS8 ideal choices for homeowners looking to enhance their indoor environment while keeping energy costs in check.
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