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.

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.

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 — Rollout switch has tripped
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
rapid flashing — Reversed 115 volt polarity, a grounding problem, or an open igniter circuit
LED off — No power to the furnace, or an internal control fault
continuous on — Normal operation — no fault stored
6 flashes — Rollout limit open, or control module fuse blown

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
Ed — Rollout switch has tripped
EC — Inducer motor overcurrent
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
2 red flashes — Pressure switch stuck closed, or an inducer error
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
4 red flashes — Open limit switch
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 red flashing — Twinning error
solid red — Internal control fault, gas valve error, microprocessor or frequency check failure
3 amber flashes — Second stage heat called with no first stage call
4 amber flashes — Cooling called with no fan call
1 amber flash — Normal operation — first stage heat
solid green — Standby — powered, no call

Goodman modulating display codes

IF — Internal control fault
Ft — Field test mode
On — Normal operation
F — Continuous fan
A — Airflow display, followed by the CFM value
H — Gas heat demand, followed by the demand percentage
HI — High heat at 100 per cent demand
LO — Low stage heat
dF — Defrost demand
P1 — Low stage compressor, heating mode
P2 — High stage compressor, heating mode
C1 — Low stage compressor, cooling mode
C2 — High stage compressor, cooling 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.