Brand: Goodman
Category: Furnace
Manual Type:
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Manual for GM9S80 - Troubleshooting and error codes + PDF Download
Uploaded: April 8, 2025, 1:57 p.m.
Manual Publish Date: 2021-07-01
Warranty Summary
Warranty information is not available in this truncated manual.
The Goodman GM9S80 furnace operates in Power Up, Heating, Cooling, and Fan Only modes.
Power Up: Applies power, performs internal checks, monitors safety circuits, and awaits thermostat call.
Heating: Closes thermostat contacts, checks safety circuits, energizes induced draft blower, warms up ignitor, opens gas valve, establishes flame, energizes circulator blower, runs furnace, thermostat opens contacts, gas valve cycles off, draft blower and circulator blower de-energize after delays, and awaits next call.
Cooling: Closes thermostat contacts, checks safety circuits, energizes outdoor fan/compressor, energizes circulator blower, runs cooling, thermostat opens contacts, compressor/fan and circulator blower de-energize after delays, and awaits next call.
Fan Only: Closes thermostat contacts, checks safety circuits, energizes circulator blower, runs fan, thermostat opens contacts, circulator blower de-energizes, and awaits next call.
Power Up: Applies power, performs internal checks, monitors safety circuits, and awaits thermostat call.
Heating: Closes thermostat contacts, checks safety circuits, energizes induced draft blower, warms up ignitor, opens gas valve, establishes flame, energizes circulator blower, runs furnace, thermostat opens contacts, gas valve cycles off, draft blower and circulator blower de-energize after delays, and awaits next call.
Cooling: Closes thermostat contacts, checks safety circuits, energizes outdoor fan/compressor, energizes circulator blower, runs cooling, thermostat opens contacts, compressor/fan and circulator blower de-energize after delays, and awaits next call.
Fan Only: Closes thermostat contacts, checks safety circuits, energizes circulator blower, runs fan, thermostat opens contacts, circulator blower de-energizes, and awaits next call.
Troubleshooting and error codes
| Symptom | LED Status | Fault Description | Corrective Actions |
|---|---|---|---|
| Normal operation | I dL | Normal operation | None |
| Furnace fails to operate | EEO | Furnace lockout due to an excessive number of ignition "retries" (3 total) Failure to establish flame Loss of flame after establishment |
Locate and correct gas interruption Replace or realign igniter Check flame sense signal, clean sensor if coated or oxidized Check flue piping for blockage, proper length, elbows, and termination |
| Furnace fails to operate | EE I | Pressure switch circuit is closed at start of heating cycle Pressure switch contacts sticking Short in pressure switch circuit wiring |
Verify proper induced draft blower performance Replace low stage pressure switch Repair short in wiring |
| Furnace fails to operate | EE I | Pressure switch circuit is not closed Pressure switch hose blocked pinched, or connected improperly |
Inspect pressure switch hose, repair/replace if necessary Inspect flue piping for blockage, proper length, elbows, and termination |
| Induced draft blower runs continuously with no furnace operation | EE2 | Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower | Check induced draft blower performance, correct as necessary |
| Induced draft blower runs continuously with no furnace operation | EE2 | Incorrect pressure switch set point or malfunctioning switch contacts Loose or improperly connected wiring Primary limit circuit is open |
Check pressure switch operation, replace as needed Tighten or correct wiring connection Check filters and ductwork for blockage Clean filters or remove obstruction |
| Circulator blower runs continuously No furnace operation | EE3 | Insufficient conditioned air over the heat exchanger Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower motor Loose or improperly connected wiring in high limit circuit |
Check circulator blower speed and performance Correct speed or replace blower motor if necessary Tighten or correct wiring connection |
| Induced draft blower and circulator blower runs continuously No furnace operation | ЕЕЧ | Flame sensed with no call for heat Short to ground in flame sense circuit Lingering burner flame Slow closing gas valve |
Correct short at flame sensor or in flame sensor wiring Check for lingering or lazy flame Verify proper operation of gas valve |
| No furnace operation | EES | Open fuse Short in low voltage wiring |
Replace fuse Locate and correct short in low voltage wiring |
| Normal furnace operation | EE6 | Flame sense micro amp signal is minimal Flame sensor is coated/oxidized Flame sensor incorrectly positioned in burner fame Lazy burner flame due to improper gas pressure or combustion air |
Clean flame sensor if coated or oxidized Inspect for proper flame sensor alignment Compare current gas pressure to rating plate and adjust as needed |
| Furnace fails to operate | EEL | Problem with igniter circuit Improperly connected or shorted igniter Poor unit ground |
Check and correct wiring from integrated control module to igniter Diagnose and replace shorted igniter as needed Verify and correct unit ground wiring if needed |
| Furnace fails to operate | EEL | Igniter relay fault on integrated control module | Check igniter output from control, replace if necessary |
| Furnace fails to operate | EER | Polarity of 115 volt AC is reversed Poor unit ground |
Correct polarity, check and correct wiring if necessary Verify proper ground, correct if necessary |
| Furnace fails to operate | EEb | Gas valve is not energized when it should be External Gas Valve Error |
Check wiring in gas valve circuit Replace integrated control board |
| Furnace fails to operate | EEC | Gas valve is energized when it should not be Internal gas valve error |
Check wiring in gas valve circuit Replace integrated control board |
| Furnace fails to operate. | EEC | No 115 power to furnace or no 24 volt power to integrated control module. | Restore high voltage power to furnace and integrated control module. |
| Integrated control module LED display provides no signal | None | Blown fuse or tripped circuit breaker Integrated control module is non- functional |
Correct condition which caused fuse to open, replace fuse Replace non-functional integrated control module. |
| Furnace fails to operate | E 10 | Grounding fault Poor neutral connection |
Verify neutral wire connection to furnace & continuity to ground source |
| Furnace fails to operate | E11 | Open roll out switch | Check for correct gas pressure Check for correct burner alignment Check for and correct burner restriction |
| Furnace fails to operate | EEn | Ignitor Open | Check for Ignitor wiring. Replace Damaged Ignitor |
| Furnace fails to operate | EEJ | Inducer relay Error | Replace integrated control board |
| Twinning feature not working | EEH | TWIN Error | Check for wiring connections. Replace integrated control board |
| Furnace fails to operate | EEE | Internal Faults or IRQ Loss in Control Board | Replace integrated control board |
Troubleshooting and error codes
| Symptom | LED Status | Fault Description | Corrective Actions |
|---|---|---|---|
| Normal operation | I dL | Normal operation | None |
| Furnace fails to operate | EEO | Furnace lockout due to an excessive number of ignition "retries" (3 total) Failure to establish flame Loss of flame after establishment |
Locate and correct gas interruption Replace or realign igniter Check flame sense signal, clean sensor if coated or oxidized Check flue piping for blockage, proper length, elbows, and termination |
| Furnace fails to operate | EE I | Pressure switch circuit is closed at start of heating cycle Pressure switch contacts sticking Short in pressure switch circuit wiring |
Verify proper induced draft blower performance Replace low stage pressure switch Repair short in wiring |
| Furnace fails to operate | EE I | Pressure switch circuit is not closed Pressure switch hose blocked pinched, or connected improperly |
Inspect pressure switch hose, repair/replace if necessary Inspect flue piping for blockage, proper length, elbows, and termination |
| Induced draft blower runs continuously with no furnace operation | EE2 | Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower | Check induced draft blower performance, correct as necessary |
| Induced draft blower runs continuously with no furnace operation | EE2 | Incorrect pressure switch set point or malfunctioning switch contacts Loose or improperly connected wiring Primary limit circuit is open |
Check pressure switch operation, replace as needed Tighten or correct wiring connection Check filters and ductwork for blockage Clean filters or remove obstruction |
| Circulator blower runs continuously No furnace operation | EE3 | Insufficient conditioned air over the heat exchanger Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower motor Loose or improperly connected wiring in high limit circuit |
Check circulator blower speed and performance Correct speed or replace blower motor if necessary Tighten or correct wiring connection |
| Induced draft blower and circulator blower runs continuously No furnace operation | ЕЕЧ | Flame sensed with no call for heat Short to ground in flame sense circuit Lingering burner flame Slow closing gas valve |
Correct short at flame sensor or in flame sensor wiring Check for lingering or lazy flame Verify proper operation of gas valve |
| No furnace operation | EES | Open fuse Short in low voltage wiring |
Replace fuse Locate and correct short in low voltage wiring |
| Normal furnace operation | EE6 | Flame sense micro amp signal is minimal Flame sensor is coated/oxidized Flame sensor incorrectly positioned in burner fame Lazy burner flame due to improper gas pressure or combustion air |
Clean flame sensor if coated or oxidized Inspect for proper flame sensor alignment Compare current gas pressure to rating plate and adjust as needed |
| Furnace fails to operate | EEL | Problem with igniter circuit Improperly connected or shorted igniter Poor unit ground |
Check and correct wiring from integrated control module to igniter Diagnose and replace shorted igniter as needed Verify and correct unit ground wiring if needed |
| Furnace fails to operate | EEL | Igniter relay fault on integrated control module | Check igniter output from control, replace if necessary |
| Furnace fails to operate | EER | Polarity of 115 volt AC is reversed Poor unit ground |
Correct polarity, check and correct wiring if necessary Verify proper ground, correct if necessary |
| Furnace fails to operate | EEb | Gas valve is not energized when it should be External Gas Valve Error |
Check wiring in gas valve circuit Replace integrated control board |
| Furnace fails to operate | EEC | Gas valve is energized when it should not be Internal gas valve error |
Check wiring in gas valve circuit Replace integrated control board |
| Furnace fails to operate. | EEC | No 115 power to furnace or no 24 volt power to integrated control module. | Restore high voltage power to furnace and integrated control module. |
| Integrated control module LED display provides no signal | None | Blown fuse or tripped circuit breaker Integrated control module is non- functional |
Correct condition which caused fuse to open, replace fuse Replace non-functional integrated control module. |
| Furnace fails to operate | E 10 | Grounding fault Poor neutral connection |
Verify neutral wire connection to furnace & continuity to ground source |
| Furnace fails to operate | E11 | Open roll out switch | Check for correct gas pressure Check for correct burner alignment Check for and correct burner restriction |
| Furnace fails to operate | EEn | Ignitor Open | Check for Ignitor wiring. Replace Damaged Ignitor |
| Furnace fails to operate | EEJ | Inducer relay Error | Replace integrated control board |
| Twinning feature not working | EEH | TWIN Error | Check for wiring connections. Replace integrated control board |
| Furnace fails to operate | EEE | Internal Faults or IRQ Loss in Control Board | Replace integrated control board |