The short answer
On a newer Goodman or Amana gas furnace in Northern Virginia, most of what the little display shows isn’t a problem. 1dL means idle, 9H means it’s heating, FAn means the fan is on, and F02 is a blower speed setting, not a fault. The real faults start with E: EE0 through EE9, EEL, EEA, EEJ and E11. If the display shows a letter code and the house is warm, you’re fine. If it’s an E code and the house is cold, that’s the one to read up on or call about.
What the display shows when nothing’s wrong
Goodman’s current boards (the GR9S, GD9S, GR9T and their Amana twins) and the modulating GRVM97 use a three-character display that reads out what the furnace is doing. The “I” in idle looks like a 1 on the screen, which is why so many people search for 1dL, and Goodman’s “g” for gas looks like a 9.
Swipe to see all columns →
Swipe to see all columns →
| The display shows | What it means |
|---|---|
| 1dL (written I dL) | Idle: no call from the thermostat, everything’s normal |
| 9H | Gas heat on a single-stage furnace |
| 9H1 or 9H2 | Gas heat, low stage or high stage |
| FAn | The fan is running on its own (the thermostat is set to fan on) |
| 1AC, 2AC, AC1 or AC2 | Cooling, first or second stage |
| HP1 or HP2 | A heat pump is heating, on a furnace paired with one |
| dF1 or dF2 | The heat pump is in defrost |
| HUd or dHU | Humidity control is running |
From Goodman’s service manuals for the current single-stage, current two-stage, modulating furnaces. Every code for every Goodman board is in our Goodman furnace codes chart.
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F01, F02 and the other F numbers
F followed by two digits isn’t a fault code on a Goodman. It’s the blower speed the installer picked. On the GR9S, F02 is the factory heating speed and F01 is the factory fan speed; on the two-stage GR9T it’s F01 for low heat, F02 for high heat and F03 for the fan. You’ll see them when someone scrolls the menu. Nobody should change them without knowing the duct system, because the wrong speed can trip the limit.
The fault codes, and where each one is explained
Swipe to see all columns →
Swipe to see all columns →
| Code | What it means | Where to read more |
|---|---|---|
| EE0 | Lockout after 3 tries to light | lockout |
| EE1 or EE2 | Pressure switch closed early, or never closed | pressure switch |
| EE3 | High limit open | limit switch |
| EE4 | Flame with no call for heat | lockout and gas valve |
| EE5 | Blown fuse on the board | no light or no power |
| EE6 | Weak flame sensor signal | flame sensor |
| EEL | Igniter problem | lockout |
| EEA | Polarity: hot and neutral reversed | rapid flashing and polarity |
| EEJ | Inducer relay error, board replacement | inducer motor |
| E11 | Rollout switch open | rollout switch |
| EE8 or EE9 | High stage pressure switch (two-stage) | pressure switch |
| EAL | Refrigerant leak sensor, R-32 systems | heat pump and AC codes |
Codes you won’t find in Goodman’s manuals
People search for 7P1, H6 and A04 on a Goodman furnace. None of the three is in Goodman’s service manuals for these boards, so we won’t guess at them. Take a photo of the display and the sticker inside the door and a tech can tell you for sure.
How to see the last codes
- Current display boards: press the left or right button until L 6 F shows, then press the center button to scroll the stored faults. Holding the center button for 5 to 30 seconds erases them, so don’t.
- Modulating furnaces: the menu has a Last 10 Faults list. After 30 seconds the display goes back to status, and an active alarm shows as E with two digits.
- Every board: the door has a safety switch that cuts power when the door comes off. Goodman notes that the stored code can be lost that way. Photograph the display before you open anything.
What you can check yourself
Goodman’s manuals are written for trained technicians and say not to bypass any safety circuit, so the line for a homeowner is the outside of the furnace. If the display shows a status code and the house is comfortable, there’s nothing to do. If it shows an E code:
- Write it down or photograph it.
- Check the thermostat is set to heat and a few degrees over room temperature. Our thermostat guide covers a blank screen.
- Check the filter and the two white pipes outside on a high efficiency furnace.
- One reset at the thermostat. If the same code comes back, stop and call.
If you smell gas, get everyone out and call the gas company from outside. If a carbon monoxide alarm is going off, that comes first.
What a tech does on the visit
The tech reads the active code and the fault history, which together show whether it’s a one-time event or a pattern, then tests the circuit the code points to. You get the price in writing before any work starts. Our heating check is $67 per system through December 31, for a furnace, heat pump or boiler.
We fix Goodman and Amana furnaces across Northern Virginia, in Ashburn, Leesburg, Sterling, Herndon, Chantilly, Fairfax, Arlington and Manassas. Every furnace repair price we charge is on our heating page.
More Goodman and Amana, one problem at a time: pressure switch: 3 flashes or EE2; limit switch: 4 flashes or EE3; lockout and weak flame: 1 flash, EE0, EE6; solid red light, no light or rapid flashing; rollout switch: 6 flashes or E11; Goodman heat pump and AC codes; flame sensor: 7 flashes or EE6; how to reset a Goodman furnace; inducer motor noises and codes; troubleshooting by symptom; Amana furnace codes; a Goodman heat pump that won’t heat; a Goodman furnace that keeps shutting off; a Goodman furnace blowing cold air; how old is my Goodman: the serial number. Other brands are in our error codes and warning lights guide.
Get it fixed
Call (703) 997-9757 and we’ll get a tech out to read your Goodman furnace’s display. We answer day or night. Rather book online? Pick a time here and a box of warm cookies comes with the visit. A repair visit starts with our $99 diagnostic, and you get the price in writing before any work starts. Already have a quote? We’ll give you a free second opinion. Rated 5.0 stars across 1,138 reviews on Google, Angi, Yelp, the BBB and Facebook, Virginia Class A license 2705192276.
Questions people ask
What does 1dL mean on a Goodman furnace?
Idle. The display says I dL, and the I looks like a 1. It means the furnace is powered and waiting for the thermostat. Nothing’s wrong.
What does F02 mean on a Goodman furnace?
It’s a blower speed setting, not a fault. On a GR9S, F02 is the factory heating speed. F01 through F09 are the speeds the installer can pick.
What does 9H mean on a Goodman furnace?
Gas heat. The 9 is Goodman’s way of drawing a g. On a two-stage furnace you’ll see 9H1 or 9H2 for low and high heat.
What does 7P1 mean on a Goodman furnace?
It isn’t in Goodman’s service manuals, so we won’t guess at it. Send a photo of the display and the model sticker and we’ll tell you for sure.
