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Goodman gas furnace light off: No power to the control board

Gas furnace, Canada and United States

The status light shows nothing because the control board has no 115 V or 24 V power, a fuse has blown or a breaker has tripped, or the board itself has failed. The furnace does not run.

This needs a licensed gas technician. There are a few safe checks you can do first, marked below. Anything inside the unit is a job for a professional.

This involves the gas supply or burner. Only a licensed technician should open the unit or work on gas parts.

What causes it

GMS8, GMH8, GMSS9, GMH95 and GKS9 boards

  1. The power to the furnace is switched off, a circuit breaker has tripped or a house fuse has blown.

    Check the thermostat and the power to the furnaceYou can do this

    1. Check the thermostat is working and set to HEAT above the room temperature, or to COOL below it if the problem is with cooling.
    2. If the blower runs all the time, look at the thermostat's fan switch. ON runs the blower constantly; AUTO runs it only while heating or cooling.
    3. Check that the power switch for the furnace, often a switch on or near it, is turned on.
    4. Check the electrical panel for a tripped circuit breaker or a failed fuse for the furnace. Reset the breaker or replace the fuse.
      If the breaker trips again, leave it off and call a qualified servicer.
    5. Make sure both furnace doors are in place. A switch stops the furnace from running while the blower door is off.

  2. The blower door is off or not seated, so the door switch has cut the power.

    Same check as above: Check the thermostat and the power to the furnace

    Book a licensed gas technician

  3. The 24 V wires are loose or connected wrongly, or a short in the 115 V or 24 V wiring has blown a fuse. On GMSS9, GMH95 and GKS9 boards the technician also checks the 3 A fuse on the control board.

    Book a licensed gas technician

  4. The integrated control board has an internal fault and needs replacing.

    Book a licensed gas technician

GMES80, GMES92 and GMES96 boards

  1. The power to the furnace is switched off, a circuit breaker has tripped or a house fuse has blown.

    Same check as above: Check the thermostat and the power to the furnace

  2. The blower door is off or not seated, so the door switch has cut the power.

    Same check as above: Check the thermostat and the power to the furnace

    Book a licensed gas technician

  3. The control has locked out because the gas valve was powered when it should be off, or off when it should be powered.

    Shut off the gas to the furnace, then the powerYou can do this

    1. Close the manual gas shut-off valve on the gas pipe outside the furnace first.
      If you smell gas, do not touch any electrical switch, do not use a phone in the building and do not try to light anything. Leave and call your gas supplier from a neighbour's phone.
    2. Only then turn off the electrical power to the furnace. Goodman says to shut the gas first whenever the furnace overheats or the gas does not shut off.
    3. Leave the furnace off and book a qualified servicer.

    Book a licensed gas technician

  4. The 24 V wires are loose or connected wrongly, or a short in the 115 V or 24 V wiring has blown the 3 A fuse on the control board.

    Book a licensed gas technician

  5. The integrated control board has an internal fault and needs replacing.

    Book a licensed gas technician

GMEC96 three-colour light

  1. No 115 V power reaches the furnace, for example the power to it is switched off, a circuit breaker has tripped or a house fuse has blown.

    Same check as above: Check the thermostat and the power to the furnace

    Book a licensed gas technician

  2. The blower door is off or not seated, or the door switch is faulty.

    Same check as above: Check the thermostat and the power to the furnace

    Book a licensed gas technician

  3. A faulty disconnect switch.

    Book a licensed gas technician

  4. No 24 V power to the control board.

    Book a licensed gas technician

How to read this code on your unit

Booking a licensed gas technician

Book a licensed gas technicianlicensed gas technician

  1. Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
  2. Note the code, how often it appears, and the model and serial numbers from the rating label.
  3. Book a licensed gas technician and give them those details.

Models that show this code

250 models in 12 ranges
RangeModels
GDH8GDH80403AN, GDH80403AX, GDH80603AN, GDH80603AX, GDH80804BN, GDH80804BX, GDH81005CN, GDH81005CX
GDS8GDS80403AN, GDS80403AX, GDS80603AN, GDS80603AX, GDS80804BN, GDS80804BX, GDS81005CN, GDS81005CX
GKS9GKS90453BX, GKS90703BX, GKS90704CX, GKS90904CX, GKS90905DX, GKS91155DX
GMH8 / AMH8GMH80403AN, GMH80403AX, GMH80603AN, GMH80603AX, GMH80604BN, GMH80604BX, GMH80803BN, GMH80803BX, GMH80804BN, GMH80804BX, GMH80805CN, GMH80805CX, GMH81005CN, GMH81005CX, GMH81205DN, GMH81205DX, GMH81405DN, AMH80403AN, AMH80403AX, AMH80603AN, AMH80603AX, AMH80604BN, AMH80604BX, AMH80803BN, AMH80803BX, AMH80804BN, AMH80804BX, AMH80805CN, AMH80805CX, AMH81005CN, AMH81005CX, AMH81205DN, AMH81205DX, AMH81405DX
GMH95 / GCH95 / AMH95GMH950453BX, GMH950703BX, GMH950704CX, GMH950904CX, GMH950905CX, GMH950905DX, GMH951155DX, AMH950453BX, AMH950703BX, AMH950704CX, AMH950904CX, AMH950905CX, AMH950905DX, AMH951155DX, GCH950453BX, GCH950703BX, GCH950704CX, GCH950905DX
GMS8 / AMS8GMS80403AN, GMS80403AX, GMS80603AN, GMS80603AX, GMS80604BN, GMS80604BX, GMS80804BN, GMS80804BX, GMS80805CN, GMS80805CX, GMS81005CN, GMS81005CX, GMS81205DN, GMS81205DX, GMS81405DN, AMS80403AX, AMS80603AX, AMS80604BX, AMS80804BX, AMS80805CX, AMS81005CX, AMS81205DX, AMS81405DN
GMSS92 / GCSS92 / AMSS92GMSS920402BN, GMSS920403AN, GMSS920603BN, GMSS920803BN, GMSS920804CN, GMSS920805CN, GMSS921004CN, GMSS921005CN, GMSS921205DN, AMSS920402BN, AMSS920403AN, AMSS920603BN, AMSS920803BN, AMSS920804CN, AMSS920805CN, AMSS921004CN, AMSS921005CN, AMSS921205DN, GCSS920402BN, GCSS920603BN, GCSS920804CN, GCSS921005CN
GMSS96 / GCSS96 / AMSS96 / ACSS96GMSS960402BN, GMSS960403AN, GMSS960603BN, GMSS960803BN, GMSS960804CN, GMSS960805CN, GMSS961005CN, GMSS961205DN, AMSS960402BN, AMSS960403AN, AMSS960603BN, AMSS960803BN, AMSS960804CN, AMSS960805CN, AMSS961005CN, AMSS961205DN, GCSS960402BN, GCSS960603BN, GCSS960804CN, GCSS961005CN, GCSS961205DN, ACSS960402BN, ACSS960603BN, ACSS960804CN, ACSS961005CN, ACSS961205DN
GMES80 / GCES80 / AMES80 / ACES80GMES800403AN, GMES800403AX, GMES800603AN, GMES800603AX, GMES800603BN, GMES800603BX, GMES800604BN, GMES800604BX, GMES800803BN, GMES800803BX, GMES800804BN, GMES800804BX, GMES800804CN, GMES800804CX, GMES800805CN, GMES800805CX, GMES801005CN, GMES801005CX, GMES801205DN, AMES800403AX, AMES800603AX, AMES800603BN, AMES800604BX, AMES800803BX, AMES800804BX, AMES800804CX, AMES800805CX, AMES801005CX, AMES801205DX, GCES800403AN, GCES800403AX, GCES800603AN, GCES800603AX, GCES800804BN, GCES800804BX, GCES801005CN, GCES801005CX, ACES800403AN, ACES800403AX, ACES800603AN, ACES800603AX, ACES800804BX, ACES801005CX
GMES92GMES920403AN, GMES920603BN, GMES920803BN, GMES920804CN, GMES920805CN, GMES921004CN, GMES921005CN, GMES921205DN
GMES96 / GCES96 / AMES96 / ACES96GMES960403AN, GMES960603BN, GMES960803BN, GMES960804CN, GMES960805CN, GMES961005CN, GMES961205DN, AMES960403AN, AMES960603BN, AMES960803BN, AMES960804CN, AMES960805CN, AMES961005CN, AMES961205DN, GCES960403BN, GCES960603BN, GCES960804CN, GCES961005CN, GCES961205DN, ACES960403BN, ACES960603BN, ACES960804CN, ACES961005CN, ACES961205DN
GMEC96 / GCEC96 / AMEC96 / ACEC96GMEC960302BN, GMEC960303AN, GMEC960402BN, GMEC960403AN, GMEC960603AN, GMEC960603BN, GMEC960803BN, GMEC960804CN, GMEC961004CN, GMEC961005CN, GMEC961205DN, AMEC960302BN, AMEC960303AN, AMEC960402BN, AMEC960403AN, AMEC960603AN, AMEC960603BN, AMEC960803BN, AMEC960804CN, AMEC961004CN, AMEC961005CN, AMEC961205DN, GCEC960403BN, GCEC960603BN, GCEC960803BN, GCEC961005CN, ACEC960403BN, ACEC960603BN, ACEC960803BN, ACEC961005CN

Where this comes from

Checked against the manufacturer's manual on 9 October 2026.

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Other Goodman gas furnace codes

Code Meaning What you can do
b6 Blower motor shut down for voltage or overheating Call a pro
E5 Open fuse on the control board Call a pro
Eb6 Blower motor shut down for voltage or overheating Call a pro
EE No power to the control board, or an internal control fault You can often fix it
EE5 Open fuse on the control board Call a pro
2 green flashes High-stage or single-stage cooling call You can often fix it
green light flashing rapidly Fan-only call You can often fix it
steady green light Standby, waiting for a call You can often fix it
1 red flash Ignition failure or gas valve fault (depends on model) Safe checks first, then a pro
2 red flashes Pressure switch closed when it should be open Call a pro
3 red flashes Pressure switch not closing Safe checks first, then a pro
10 red flashes Power supply problem or gas valve fault (depends on model) Depends on your model

See all power supply problem codes on gas furnaces across brands.