Goodman Furnace EAF Error Code: Abnormal Flame Sense

Quick Answer

Goodman EAF means the flame sensor microamp reading is outside the expected range during burner operation. Normal flame sensor output on a Goodman furnace is 0.5-8 microamps DC. A reading below 0.5 uA means the flame is not being reliably detected even though it may be burning.

EAF is almost always a dirty sensor. You'll see the burners light right up, but the board kills the gas after a few seconds because it can't confirm a stable flame signal. If you've been doing dusty renovations or haven't had a tune-up in a couple years, carbon buildup on that thin metal rod is blocking the tiny ionization current the furnace needs to stay running. Clean it first.

GoodmanFurnaceSeverity: moderateDifficulty: intermediate81% DIY Success

Time to Fix

15–45 min

Difficulty

intermediate

Parts Cost

$10 – $20

Tools Needed

Phillips #2 screwdriver, 1/4 inch nut driver

What Does the EAF Code Mean?

While other codes like F01 mean the furnace failed to light, EAF tells you the fire is there but the signal is weak or erratic. On Goodman GMVC and GMSS units, the control board is very picky about that microamp current. I always check the sensor rod for oxidation first, but if cleaning it doesn't fix it, we've got to look at gas pressure or the rare control board failure.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Coated or corroded flame sensor rod reducing ionization current40%

Weak flame from low gas pressure giving insufficient microamp signal24%

Control board flame sense circuit degraded22%

Grounding fault in flame sensor circuit14%

Symptoms You May Notice

Furnace ignites, you hear the click and see the flame through the sight glass, then it cuts out after about 3-7 seconds like someone flipped a switch
The LED on the control board is flashing the EAF fault sequence after every single ignition attempt
Intermittent heat, works fine in the morning but by afternoon it's acting up and won't stay on
You can literally see the burners running through the little sight glass, flame and everything, but the furnace still shuts itself off
Thermostat keeps calling for heat but the house never actually warms up because the furnace is stuck in a retry loop and eventually locks out

Can you reset a Goodman furnace to clear the EAF code?

After your repair, flip the power switch on the side of the furnace off and wait a full 30 seconds. Don't just cycle it real quick. Flip it back on and the board runs a self-check before it tries to fire again. Give it a minute. If the repair worked you'll hear it go through its normal ignition sequence and EAF won't come back. If it does come back, you're either still getting a weak signal or you've got a board issue.

Tools Required for Diagnosis

Phillips #2 screwdriver1/4 inch nut driverMultimeter with DC microamp (uA) setting000-grade steel wool or 400-grit emery clothFlashlight or headlampNeedle-nose pliers

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test

Expected Range0.5–8 uA

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Flame Sensor RodB11726-06 · $10–$20	B11726-06	$10 – $20

Frequently Asked Questions

What is the normal flame sensor reading on a Goodman furnace?

You're looking for a steady reading between 0.5 and 8 microamps DC. In my experience a clean, healthy sensor usually sits right around 2.5 to 4.0 uA. Anything below 0.5 and the control board treats it as a safety failure and shuts the gas valve off. It's a very sensitive circuit and even a light coating on the rod can drop you from 3.5 uA down to 0.2 uA, which is enough to trigger EAF every single time the furnace tries to run.

How do I measure flame sensor microamps on a Goodman?

You've got to put the meter in series, meaning the current actually flows through the meter itself. Disconnect the wire from the sensor terminal, attach one lead to the sensor and the other lead to the wire you just pulled off. Set the dial to DC microamps, the uA setting. When the furnace lights, the meter shows you the ionization current in real time. If you're getting zero, check your meter fuses first because those blow way more often than people realize. Also make sure you're on DC, not AC, because AC will read zero even on a working sensor.

How often should I clean the flame sensor on my Goodman?

Once a year at fall startup. Seriously, just make it part of the routine. It's the single most common cause of a no-heat call on these Goodman units and it takes about five minutes with a piece of steel wool. If your furnace is in a laundry room, near a workshop, or in a space where aerosols get used regularly, bump that up to every 6 months. Lint, dust, and chemical vapors coat that rod a lot faster in those environments than in a clean utility room.

Can I bypass the flame sensor to get my heat running temporarily?

Don't. I know you're cold, but the flame sensor is a safety device, full stop. It's there to confirm that a real flame exists before the gas valve stays open. Without it, you could have gas flowing with no ignition and not even know it. These Goodman control boards don't make it easy to bypass anyway. A replacement sensor is like $12-20 and most suppliers can ship it next day. That's a way better plan than messing around with the safety circuit.

How much does it cost to replace a flame sensor on a Goodman furnace?

The sensor itself is cheap, honestly. OEM Goodman flame sensors run about $15-25. A universal replacement works fine on most of these units and you can find them under $10 at any HVAC supply house. If you're calling a tech out, plan on $100-150 in service call and labor even though the actual swap is maybe 10 minutes of work. The expensive scenario is when the flame sense circuit on the control board has failed, and those boards run $150-300 depending on the model. That's exactly why I always start with the cheap stuff first and work my way up.

Related Goodman Furnace Error Codes

Code: HUBGoodman Furnace Error Codes: LED Flash Code Guide for GMVC and GMSS Series Code: F01Goodman Furnace F01 Error Code: Ignition Failure After 3 Attempts Code: E1CGoodman Furnace E1C Error Code: Flame Sense Without Call for Heat Code: RESETHow to Reset a Goodman Furnace and Clear Error Codes

Models Known to Experience EAF Errors

This repair applies to most Goodman furnaces with this error code. Common model numbers include:

GMVC96, GMSS92, GCVC96, AMVC96, ASST96, GMVC80, ACVC96, GMEC96

Written by

Raj Patel

HVAC & Water Systems Specialist · 15 years experience

Last verified for technical accuracy on March 14, 2026