Goodman and Amana furnace fault codes

Goodman and Amana furnaces share control boards and share fault codes. What a given code means depends on which board your furnace has — and the same flash count means different things across the range.

Also covers: Amana — same manufacturer, same controls, same codes.

Goodman and Amana are the same manufacturer and use the same integrated furnace controls, so a code list for one applies to the other. Three different diagnostic systems appear across the range, and knowing which one you are looking at is the first step: older single-LED boards flash a count, later boards show a two-character alphanumeric code on a small display, and the GMEC96 and AMEC96 use a three-colour LED where the colour carries as much meaning as the count. The model number on the rating plate tells you which.

Codes for a specific model

Goodman publishes fault codes per model, and they differ between models. If you have the model number from the rating plate, start here rather than with the brand-wide list below.

Goodman GMH — also sold as Amana ACSS9 / AMH and Goodman GCH / GCSS9 / GDH / GME — 11 codes
Goodman GCVC96 — also sold as Amana ACVC95 / ACVC96 / AMVC95 / AMVC96 and Goodman GCVC8 / GCVC95 / GMVC95 — 31 codes
Goodman GCVM97 — also sold as Amana ACVM96 / ACVM97 / AMVM96 / AMVM97 and Goodman GCVM96 / GMVM96 / GMVM97 — 43 codes
Goodman GMEC96 — also sold as Amana AMEC96 — 24 codes
Goodman GMSS9 — also sold as Amana AMSS9 — 11 codes
Goodman GMV8 — also sold as Amana AMV8 / AMV9 — 12 codes
Goodman GMS — also sold as Goodman GDS / GHS / GKS — 10 codes
Goodman GMP — also sold as Goodman GMN / GMNT / GMPE / GMPH / GMPN / GMPV / GMT — 8 codes
Goodman GMV9 — 11 codes
Goodman GMVC96 — also sold as Goodman GMVC8 — 32 codes

Worth knowing before you count

Six flashes means a rollout switch on a GMS or GMH board, but on a GMSS9 or AMSS9 it covers a rollout limit or a blown control fuse — a serious combustion fault and a minor electrical one, sharing a count. And on the GMEC96 three-colour boards, one red flash and one amber flash mean completely different things.

How Goodman furnaces signal codes

On the three-colour GMEC96 boards, read the colour before the count: red is always a fault, green is cooling or standby, and amber is mostly — but not entirely — heating status. One and two amber flashes are normal first and second stage heat, yet rapid amber is a low flame sense warning and three and four amber flashes are thermostat wiring faults, so colour narrows the meaning without settling it. On every board, watch several full cycles, since codes repeat after a pause and a partial count is the most common wrong answer. One Goodman-specific trap deserves its own sentence: on these controls a failed igniter and a bad earth ground share a single code — 8 flashes, E7, or rapid flashing depending on the board — because the control cannot tell them apart, a gap Goodman documented in service bulletin SF-024. Checking the ground connection costs nothing; an igniter bought against a grounding fault fixes nothing.

The Goodman codes people look up most

One flash and E0 — the lockout after failed ignition attempts — lead the searches, and they usually trace back to something cheaper than a lockout sounds. Three flashes and E2 are the pressure switch refusing to close, a draft question; four flashes and E3 are the open high limit, an airflow question. Seven flashes and E6, the weak flame signal, is the dirty-flame-sensor code. And E5, the open low-voltage fuse, matters because it can present as a completely dark furnace rather than as a code at all.

What the common Goodman fixes cost

The seven-flash and E6 weak flame signal usually resolves with flame sensor cleaning at $80–200. The 8-flash and E7 igniter code is $150–350 installed when the igniter really has failed — with the grounding check done first, for the SF-024 reason above. Pressure switch codes run $150–400 with the flue ruled out first; an open limit is $150–350 plus finding the airflow cause. E5's open fuse is a $5–150 repair that impersonates a $400–900 dead board, and the b-series blower codes on communicating models land in ECM territory: $700–1,200, or $900–1,500+ for variable-speed.

Goodman and Amana

1 flash — Lockout after too many failed ignition attempts
2 flashes — Pressure switch is closed when it should be open
3 flashes — Pressure switch will not close
4 flashes — High limit switch is open — the furnace is overheating
5 flashes — Flame detected when no flame should be present
6 flashes Goodman GMS, GMH, GMV8, GMV9 and Amana AMH, AMV9 series — Rollout switch has tripped
6 flashes Goodman GMSS9 and Amana AMSS9 series — Rollout limit open, or control module fuse blown
7 flashes — Flame signal is too weak
8 flashes — Igniter circuit fault, most often caused by poor grounding
9 flashes — High stage pressure switch stuck open
continuous on — Normal operation — no fault stored
LED off — No power to the furnace, or an internal control fault
rapid flashing — Reversed 115 volt polarity, a grounding problem, or an open igniter circuit

Goodman and Amana display codes

E0 — Lockout after too many failed ignition attempts
E1 — Low stage pressure switch closed at the start of the heating cycle
E2 — Low stage pressure switch stuck open
E3 — High limit switch is open — the furnace is overheating
E4 — Flame detected when no flame should be present
E5 — Low voltage fuse is open
E6 — Flame signal is too weak
E7 — Igniter fault or improper grounding
E8 — High stage pressure switch closed at the start of the heating cycle
E9 — High stage pressure switch stuck open
EA — Reversed 115 volt polarity
EC — Inducer motor overcurrent
Ed — Rollout switch has tripped
EF — Auxiliary switch or input is open

Goodman and Amana blower codes

b0 — Blower motor is not running
b1 — Blower communication error
b2 — Blower motor horsepower mismatch
b3 — Blower motor operating at a power, temperature, or speed limit
b4 — Blower motor current trip or lost rotor
b5 — Blower motor locked rotor
b6 — Blower motor over or under voltage trip, or over temperature trip
b7 — Incomplete parameters sent to the motor
b9 — Low indoor airflow
d0 — Data not yet on network
d4 — Invalid memory card data

Goodman GMEC96 and Amana AMEC96 colour codes

1 red flash — Flame sensed when no flame should be present
1 amber flash — Normal operation — first stage heat
1 green flash — Normal operation — low stage cooling
2 red flashes — Pressure switch stuck closed, or an inducer error
2 amber flashes — Normal operation — second stage heat
2 green flashes — Normal operation — high stage or single stage cooling
3 red flashes — First stage pressure switch stuck open, or an inducer error
3 double red flashes — Second stage pressure switch stuck open, or an inducer error
3 amber flashes — Second stage heat called with no first stage call
4 red flashes — Open limit switch
4 amber flashes — Cooling called with no fan call
5 red flashes — Open rollout switch, or open fuse detected
6 red flashes — Pressure switch cycle lockout
7 red flashes — External lockout — ignition retries exhausted
8 red flashes — External lockout — recycles exhausted
9 red flashes — Grounding problem or reversed polarity
10 red flashes — Gas flow detected with a call for heat
11 red flashes — Limit switch open due to blower failure
12 red flashes — Ignitor relay failure
rapid amber flashing — Low flame sense current
rapid green flashing — Normal operation — fan only, no heating or cooling
rapid red flashing — Twinning error
solid green — Standby — powered, no call
solid red — Internal control fault, gas valve error, microprocessor or frequency check failure

Goodman modulating display codes

A — Airflow display, followed by the CFM value
C — Compressor cooling with a single stage compressor
C1 — Low stage compressor, cooling mode
C2 — High stage compressor, cooling mode
d — Dehumidification cooling with a single stage compressor
d1 — Dehumidification, low stage cooling, communicating mode
d2 — Dehumidification, high stage cooling, communicating mode
dF — Defrost demand
F — Continuous fan
Ft — Field test mode
H — Gas heat demand, followed by the demand percentage
HI — High heat at 100 per cent demand
IF — Internal control fault
LO — Low stage heat
On — Normal operation
P — Compressor heating with a single stage compressor
P1 — Low stage compressor, heating mode
P2 — High stage compressor, heating mode

Other manufacturers

This site is a reference, not a substitute for a licensed HVAC technician. Gas appliances can leak carbon monoxide and cause fire. Anything involving gas lines, the heat exchanger, or the flame sensing circuit should be handled by a licensed professional. Pages are written with AI assistance from the sources listed on each page and checked against them before publishing.