Goodman Furnace Codes by Series

Key facts

How to find your series

Match the model number on your furnace's rating plate to the series names below. None of the ten installation manuals explains where on the cabinet the plate sits or how to decode the model letters, so this page does not try to either.

Each manual was accepted only after a second copy with the same document number turned up from an independent supplier, or the copy came from Daikin's own document server; Daikin is Goodman's parent company. Where a newer revision changed a meaning, the newest is used and the change is called out.

How to read a Goodman code

Count the flashes on an LED furnace, and read the characters on a display furnace. Goodman's single-LED charts name the count ("3 FLASHES"), and the *MSS9* flash code list adds "then pause", so a code is one group of flashes followed by a gap, repeating. On the *MEC96 you also need the colour, because red three flashes and amber three flashes are different faults.

The display furnaces use a seven-segment font, and it changes how some letters look. In the manuals' display font the letter g is drawn with the same segments as a 9, so the gas-heat status gH appears as "9H", and the capital I in IdL is a short bar that reads as a 1. Those two readings get pages of their own: 9H and 1dL.

*M9S96 / *C9S96 / *M9S92 codes (IOG-2029A)

These furnaces show their status and faults on a three-character display, and apart from the no-power row (None, drawn “nonE”) every fault code in the chart starts with E. The table is IOG-2029A (02/2022), the copy on Daikin's own document server. The newer IOG-2029D adds two codes, EbL and EbU, but it was found only on a shared hosting service this site does not cite, so those two are not listed here.

Stored faults, in the manual's words (p. 43): "To View & Clear Fault Codes • Press either the Left or Right switch until L 6 F is displayed. • Press the center switch to view stored faults. • Press and hold the center switch for 5 to 30 seconds. • All stored faults will be erased, and the display will flash - - - three times and return to L 6 F."

The "Fault Description" column in this chart lists the fault and then its possible causes in one cell, and the cells are reproduced whole. The chart's corrective-action column is written for service technicians and is not reproduced. The normal readings, from the "1 Stage Status Codes" table on p. 42:

*M9C96 / *C9C96 codes (IOG-2027B)

The *M9C96 uses the same three-character display and largely the same codes as the *M9S96, with a second set of pressure-switch codes for high stage (EE8, EE9). The table is IOG-2027B (02/2022); IOG-2027A has an identical troubleshooting chart. The wiring diagram (p. 46) gives the recall: "TO RECALL THE LAST 6 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCH FOR MORE THAN 2 SECONDS WHILE IN STANDBY (NO THERMOSTAT INPUTS)".

The status table on p. 44 differs between revisions. IOG-2027A lists "Gas heat, Low Stage" as gH1 and "Gas heat, High Stage" as gH2; IOG-2027B, under a "2 STAGE STATUS CODES" heading, lists a single "Gas heat - Single Stage Control" as gH. This is the IOG-2027B table:

*MEC96 / *CEC96 codes (IOG-2011U)

The *MEC96 is the only series here with three LED colours. Green describes what the thermostat is calling for; amber reports heating calls, two thermostat-signal problems and low flame sense current; and red reports faults. All five revisions found, from IOG-2011K to IOG-2011U (02/2022), carry the same chart, which is on pp. 54–55 of revision U.

Stored faults (p. 50): "To retrieve fault codes, push and release the “LAST ERROR” button for more than 1/ 5 second and less than 5 seconds (the LED will indicate this period by solid GREEN for 1/5 second to 5 seconds). The LED will flash up to five stored fault codes, beginning with the most recent. If there are no fault codes in memory, the LED will flash two green flashes." The manual adds: "Solid LED error codes will not be displayed."

*MVM97 / *CVM97 codes (IOG-2007E)

This modulating series uses a two-character display, so its codes are E2 and b0 rather than EE2. It also has a red communications LED and a green receive LED for the communicating thermostat network. The tables are IOG-2007E (9/2016): the wiring-diagram code list on p. 61, with the matching troubleshooting-chart description from pp. 56–60 alongside.

Recall and clear (p. 50): "FAULT RECALL SEQUENCE • Only allowed in standby mode while display is showing ON. • Hold fault recall push-button for 2-5 seconds (until display is blank) and then release." Clearing: "Hold fault recall push-button for 5-10 seconds (until display starts flashing “—”) and then release."

Network LEDs, p. 50:

*MVM96 / *CVM96 codes (IO-406E)

The *MVM96 shares the two-character display and nearly all of its code list with the *MVM97. The tables are IO-406E (05/13). One difference in the source: the IO-406E troubleshooting chart has no row for E7, while its wiring-diagram list on p. 57 does ("IGNITER FAULT OR IMPROPER GROUNDING"), so that row shows only the list wording.

The recall and clear sequence is printed on pp. 46–47 in the same words as the *MVM97 manual. Compared with the first issue (IO-406, 6/11), revision E drops the network-LED row "Red Communications LED: 1 Flash".

Network LEDs, p. 47:

*MSS9* / *CSS9* codes (IOG-2009E)

This series has one LED and a flash code list on p. 40, with a fuller troubleshooting chart on pp. 42–43. The table puts both side by side. Fault recall (p. 39): "FAULT RECALL (96% Models Only) The last five fault codes stored can be displayed on the diagnostic LED. When the control is in standby mode (no call for heat or cool), press the FAULT RECALL switch for approximately two seconds or until the diagnostic LED turns off."

To erase them, the same page says: "press the FAULT RECALL switch for five to ten seconds or until the diagnostic LED begins to rapid flash." Against the 08/14 first issue, revision E changes six flashes from "Open rollout switch" to "Open rollout switch / open control board fuse" and adds the 8 FLASHES and STEADY ON chart rows.

Within revision E itself, eight flashes are "Igniter relay fault" in the flash code list (p. 40) and "•Problem with igniter circuit." in the chart (p. 43). Both are shown above as printed.

*MVC80 / *CVC80 codes (IOG-2023A)

The *MVC80 uses a three-character display, with a longer status list than the other display series because it also reports heat pump, inverter and dehumidification modes. The tables are IOG-2023A (05/2020), which Goodman's parent company hosts directly; the 08/2019 first issue has the same code tables.

On stored faults, p. 28 says: "Accessing the furnace’s diagnostic menu provides access to the last six faults detected by the furnace. Faults are stored most recent to least recent, Any consecutively repeated fault is stored a maximum of three times." It adds: "NOTE: It is highly recommended that the fault history be cleared when performing maintenance or servicing the furnace."

Status codes, p. 32:

*M9S80*U codes (IOG-2031A)

This series has a three-character display and a fault list that includes five "APS" codes not found in the other manuals. It is also the one where EEb and EEC are the other way round from the *M9C96, *M9S96 and *MVC80; see "Same code, different meaning" below. The tables are IOG-2031A (04/2022).

Stored faults (p. 25): "Clear Fault Memory To clear all alarm codes, navigate to the last six faults menu, L6F, and hold the option button down for 5 seconds." The same page explains that the stored faults are viewed from the L6F menu using the control's menu and option buttons.

The wiring-diagram table on p. 32 prints each code one character per segment, which is where "1 d L" for Idle and "E 1 I" for the burner limit come from. Status codes from the "Control Board Status Menu" on p. 19:

*MES80 / *CES80 codes (IOG-2021G)

The *MES80 has one LED. Revision G (08/2021) prints a flash code list on p. 25, split under the headings "Flash Codes stored in memory (auto-erased after 14 days)" and "Flash Codes NOT stored in memory", and a troubleshooting chart on pp. 29–31. The table shows both.

Recall and erase (p. 26): "Fault recall shall be via momentary push button switch when held depressed for 2–5 seconds while control is in standby mode. The control shall flash the last five status codes that have occurred." And: "The last five fault codes can be erased from memory by depressing the fault recall switch for 5–10 seconds."

The chart's footnote, p. 31: "1Integrated control module will automatically attempt to reset from lockout after one hour. 2LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch."

The wording changed between revisions. In IOG-2021A (05/2019) four flashes were "•Primary limit circuit is open." and eight were "•Problem with igniter circuit."; from IOG-2021D (03/2020) they read "• Primary or auxiliary limit circuit is open." and "• Igniter Relay Fault". Revision A also had no 9 to 12 flash rows.

GMH95 / GCH95 codes (IO-299P)

The GMH95 is the oldest series here, with one LED and a troubleshooting chart on pp. 42–43 of IO-299P (10/2012). Fault recall (p. 39): "The ignition control is equipped with a momentary pushbutton switch that can be used to display on the diagnostic LED the last five faults detected by the control. The control must be in Standby Mode (no thermostat inputs) to use the feature."

The earlier IO-299B (7/07) differs in two places. It has no 8 FLASHES row, and its four flashes read "•Primary or auxiliary limit circuit is open.", where revision P says "•Primary limit circuit is open."

Codes that aren't errors

Three readings bring people here that are not fault codes at all. gH, which the display font draws as "9H", is the gas-heat status; IdL, read as "1dL", means idle and waiting for the thermostat; and F01 to F09 are blower speed numbers that appear while settings are being changed.

• Goodman 9H: gas heat status, not an error
• Goodman 1dL (IdL): idle, not an error
• Goodman F02: blower speed, not an error

7P1 does not appear in any of the Goodman furnace installation manuals we checked (list in Sources).

Same code, different meaning

These are the places where Goodman's own documents give one code two meanings, or where a newer revision changed the wording. If your manual's revision differs from the one cited, read your copy.

8 flashes on "H" model furnaces (SF-024)

Goodman addressed an undocumented eight-flash code in Service Bulletin SF-024, dated November 3, 2008 and sent "TO: All Service and Parts Managers". It covers the ignition control used on "“H” model furnaces (GMH,.AMH, GCH and GDH)", which "may display an Eight (8) Flash Fault Code for which there isn’t a description either on the furnace wiring diagram or in our Service and Technical manuals."

The bulletin's explanation: "According to the control manufacturer, the eight (8) Flash Fault Code indicates an igniter relay fault or a shorted HSI." It reports grounding as the most common field cause and tells service staff to tighten the furnace ground connections, then "turn off the power to the furnace for 10 seconds and then turn the power back on and all fault codes will be reset. If the code returns replace the HSI."

The dates line up with the GMH95 manuals above: IO-299B (7/07) has no eight-flash row, the bulletin follows in November 2008, and IO-299P (10/2012) lists 8 FLASHES as "•Problem with igniter circuit." The bulletin itself names no series number, and its steps are addressed to service staff.

Goodman's safety wording

Every manual cited here prints the same gas-leak instruction near the front, and the furnace pages on this site carry it in Goodman's words as well as in the general guidance above. It sits on p. 3 of IOG-2029A, IOG-2027B, IOG-2011U, IOG-2009E, IOG-2031A and IOG-2021G, p. 2 of IOG-2023A, and p. 4 of IOG-2007E, IO-406E and IO-299P.

What an owner can do, and what Goodman reserves for a servicer

The maintenance sections in these manuals are short, and they mark most items "Qualified Servicer Only". Two things are not marked that way: keeping the filter clean, and looking at the burner flame. The annual inspection is assigned to "a qualified installer, or service agency".

Pages for the flash counts people look up most

Three and four flashes are the counts searched most, and each now has its own page. Each page lays out the wording series by series and revision by revision, so you can see where the meaning holds and where it changes.

• Goodman furnace 3 flashes: pressure switch stuck open
• Goodman furnace 4 flashes: open limit circuit

For a different brand's scheme, Carrier's two-digit flash codes are on the Carrier furnace codes hub.