6 flashesGoodman, Amana, Daikin · GMV / GMH / GMS / GMN · Furnace

Goodman, Amana, Daikin GMV / GMH / GMS / GMN error code 6 flashes

Rollout switch open

Goodman is the platform name, and your unit may not say it

Amana AMV / GCH / GDS, Daikin GMV / GMH / GMS / GMN platform are the same board with a different badge, so this page covers all of them. The fault, the checks and the parts are identical, which is why there is one page rather than one per brand.

Stop using it

Also written as 6 blinks

Which models this applies to. Applies to GMV8 / GMV9, GCH / GDH / GME / GMH, and GDS / GHS / GMS / GKS. GMN, GMP and GMT stop at five flashes, so those units can never report a 6. If you own a GMN and count six blinks, it is not this table.

Quick answer

On Goodman GMV / GMH / GMS / GMN (1990s-2000s), 6 flashes is a fault. It means rollout switch open. A first thing to check: Cracked or failed heat exchanger.

Applies to: Goodman GMV / GMH / GMS / GMN; Goodman, Amana and Daikin legacy furnace flash codes (GMV, GMH, GMS, GMN series) · Furnace · 1990s-2000s
Type of code: Fault; Urgency: Stop using it
First safe check: Note where the unit is installed. Rollout faults on units in closets, attics or utility rooms are far more common.

Checked 2026-09-26

What 6 flashes means on this model

The rollout switch is a heat sensor mounted right above the burner. It opened because the burner area got hotter than the switch allows, which is a sign of flame or gas escaping past the heat exchanger. The control shuts down to keep those gases from moving through the house.

Symptoms you will notice

Furnace will not fire
Code appears shortly after the burner lights
Burner area or cabinet feels unusually hot
Musty or chemical smell near the furnace

Common causes

The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:

Cracked or failed heat exchanger
Rollout switch failed closed or out of calibration
Burner assembly misaligned so flame licks past the heat exchanger
Combustion air problem causing incomplete burn
Blocked or disconnected flue

What you can safely check

These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.

Note where the unit is installed. Rollout faults on units in closets, attics or utility rooms are far more common.
Look at the vent pipe inside the cabinet for a crack, a gap, or disconnected joint.
Confirm the burner assembly is fully seated and that the gasketing is intact.

Do not do these

×Do not bypass or hold down the rollout switch. It is detecting a genuine fire hazard.
×Do not run the furnace if you smell gas or notice a chemical smell in the cabinet.
×Do not attempt to repair a heat exchanger.

When to call a technician

Stop using the appliance and call today

This one is a safety limit, not a nuisance. The control is shutting the unit down to prevent damage or a hazard, and it will keep doing that until the underlying cause is fixed. Running it anyway risks the expensive failure it was designed to prevent.

This is a fuel-burning appliance, so treat anything involving a burner, gas valve or flue as technician work. If you smell gas at any point, leave the property and call the gas utility from outside rather than continuing to diagnose.
If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.

Not a homeowner repair. Any rollout fault is a call to a licensed technician.

What it costs to fix

Parts

Heat exchanger assembly $400 to $1,200 depending on model. Rollout switch $20 to $50. Burner assembly $150 to $400.

Labor

Half a day or more, and on a cracked heat exchanger it is usually a replace-the-unit conversation.

DIY or technician