Goodman Furnace F01: Ignition Failure After 3 Attempts

Quick Answer

Goodman F01 means the furnace tried to light three times and the flame sensor never confirmed a flame. The two most common physical causes are a cracked or failed hot surface ignitor and a coated flame sensor rod. Test the ignitor with a multimeter: silicon carbide ignitors should read 40-90 ohms - an open (OL) reading means the ignitor is cracked and must be replaced.

When I walk into a home with an F01 lockout, the customer usually tells me they hear the furnace trying to start, but the air never gets warm. This code is a safety feature that prevents unburned gas from building up in your heat exchanger. Most of the time, the furnace is actually fine, but a cheap component like the ignitor has developed a hairline crack or the flame sensor is just dirty from years of dust.

GoodmanFurnaceSeverity: highDifficulty: intermediate80% DIY Success

Time to Fix

30–90 min

Difficulty

intermediate

Parts Cost

$10 – $300

Tools Needed

Phillips #2 screwdriver, Flat head screwdriver

What Does the F01 Code Mean?

Think of F01 as the furnace's three-strike rule. On these Goodman units, the control board looks for a specific microamp signal from the flame sensor within seconds of the gas valve opening. If it doesn't see that signal three times in a row, it shuts down for safety. Most failures happen during the first cold snap when the ignitor is under the most stress.

Most Likely Causes

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

Cracked or open-circuit hot surface ignitor40%

Coated or corroded flame sensor rod24%

Failed gas valve22%

Low gas supply pressure14%

Symptoms You May Notice

The furnace runs through its startup cycle three times and then goes completely quiet with no heat, no air movement, just the F01 code blinking on the control board.
You can see the ignitor glowing bright orange through the sight glass but the burners never catch, or they flash on for a second or two and then drop out immediately.
The whole house stays cold even though the thermostat's calling for heat and you can hear the furnace trying to do something.
Control board LED is flashing a specific pattern and when you count the flashes it works out to the F01 sequence described in your manual.
Clicking sounds during startup with no flame, like the gas valve is trying to fire but nothing's actually happening downstream.

Can you reset a Goodman furnace to clear the F01 code?

To clear the F01 lockout, you can cycle the power at the furnace's service switch or the main breaker. Keep it off for at least 30 seconds to allow the control board capacitors to discharge completely. Once you flip it back on, the furnace will attempt a fresh ignition sequence. Just remember that if you haven't fixed the underlying part failure, the code will return after three more failed attempts.

Tools Required for Diagnosis

Phillips #2 screwdriverFlat head screwdriverDigital multimeter (DC microamp range is a bonus for sensor testing)Fine steel wool (0000 grade) or 400-grit emery clothFlashlight or headlampWork gloves (the burner box sheet metal edges are sharp)

Diagnostic Checklist

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

ComponentComponent Under Test

Expected Range40–90 ohms

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
Hot Surface IgnitorB1401015S · $25–$50	B1401015S	$25 – $50
Flame Sensor RodB11726-06 · $10–$20	B11726-06	$10 – $20
Gas ValveB1282732 · $150–$300	B1282732	$150 – $300

Frequently Asked Questions

How do I test a Goodman hot surface ignitor?

Grab your multimeter and set it to ohms. Find the two wires going to the ignitor and unplug the molex connector. Put your probes into the connector pins on the ignitor side of that connector. A healthy Goodman ignitor reads between 40 and 90 ohms. If your meter shows OL, that element's physically cracked and it's done. Don't touch the gray ceramic part when you install the new one. The oils from your skin create hot spots that'll burn it out within a few weeks. I've seen brand new ignitors fail in under a month because someone grabbed the element bare-handed during install.

How often should I replace the ignitor on a Goodman furnace?

In the field I usually see these fail every 4 to 6 years, sometimes longer if the furnace is in a clean dry space. They're a wear item, basically like a lightbulb. Every single startup that element heats up past 2,000 degrees and then cools back down. Do that a couple thousand times and something's gonna crack eventually. Damp basements and laundry chemical fumes kill them faster. Honest advice? Tape a spare ignitor to the side of the furnace cabinet. The part's like $20 and it'll save you a miserable cold night waiting on a tech.

What if cleaning the flame sensor doesn't fix F01?

Cleaning works if it's just dirty, but you should verify the actual signal with a multimeter that can read DC microamps. Connect it in series with the flame sensor wire while the furnace runs. You want at least 1.0 microamp for a reliable signal on a Goodman board. If the reading's low even after cleaning, check the ground wire on the burner housing. A loose ground screw is a super common problem that mimics a bad sensor and a lot of techs miss it. Tighten that ground and re-run the test. Still getting weak signal? The sensor itself is probably due for replacement. They're only about $12.

How much does it cost to fix a Goodman F01 error?

Depends on what's actually broken. A replacement hot surface ignitor runs $15 to $30 if you buy the part yourself, and the swap takes maybe 20 minutes. Part number B1401015S fits a lot of Goodman models. Call an HVAC tech and you're looking at $150 to $250 for the service call plus the part. Flame sensor cleaning is basically free. A new gas valve is a bigger deal, $80 to $150 for the part alone, and you should have a licensed tech handle that one. Honestly most F01 calls end up being a $20 ignitor or a free cleaning job.

Is it safe to keep resetting an F01 lockout?

The lockout is actually protecting you. The furnace won't let gas build up without a confirmed flame, so it shuts down after three failed attempts on purpose. But don't just keep cycling the power hoping it'll eventually catch. You're not solving anything and you're stressing the control board and gas valve with every attempt. If it fails twice in a row after a manual reset, something is actually broken. Run some space heaters, get the actual diagnosis done, and fix the root cause. F01 doesn't go away on its own.

Related Goodman Furnace Error Codes

Code: HUBGoodman Furnace Error Codes: LED Flash Code Guide for GMVC and GMSS Series Code: EE3Goodman Furnace EE3 Error Code: 3 Consecutive Ignition Lockouts Code: EE5Goodman Furnace EE5 Error Code: 5 Consecutive Ignition Lockouts Code: EAFGoodman Furnace EAF Error Code: Abnormal Flame Sense Code: RESETHow to Reset a Goodman Furnace and Clear Error Codes

Models Known to Experience F01 Errors

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

GMVC96, GMSS92, GCVC96, AMVC96, ASST96, GMEC96, GMES96, GCSS92

Written by

Raj Patel

HVAC & Water Systems Specialist · 15 years experience

Last verified for technical accuracy on March 14, 2026