Amana fault codes

Ignition retries exceeded.

1 plate

Single switch welded or IFC input shorted.

1 plate

Draft / trap / hose / inducer.

1 plate

Airflow or overfire.

1 plate

Leaking valve or false flame sense.

1 plate

Flame containment.

1 plate

Weak µA.

1 plate

Open / cracked HSI.

1 plate

L1/N or chassis ground.

1 plate

IFC commanded the serial ECM and does not detect it running.

6 plates

IFC cannot communicate with the variable-speed blower. Furnace will not operate.

6 plates

Connected motor horsepower does not match the value in the furnace shared-data set. Furnace will not operate.

4 plates

b2 = motor HP does not match the shared-data set. b3 = motor folding back on power/speed/temp. b9 = airflow below calculated minimum.

2 plates

ECM is folding back on power, speed, or temperature. Furnace keeps running at reduced CFM.

2 plates

b3 = folding back on power/speed/temp (reduced CFM). b9 = airflow below calculated minimum.

2 plates

b4 = lost rotor or overload trip. b5 = locked rotor after 10 start attempts.

1 plate

b4 = lost rotor or overload trip (shuts down and retries). b5 = locked rotor after 10 start attempts. b7 = motor parameters missing or failed to start after 40 attempts.

3 plates

Indoor airflow fell below the calculated minimum. Furnace stages down (high to low) and will halt if CFM reaches 0.

2 plates

ComfortBridge data pair only. Invalid as a diagnosis on a 24V Y1/Y2 hookup.

3 plates

Indoor lost the communicating thermostat or the outdoor on the data pair. Not a furnace E-code. Not 24V Y.

1 plate

d0 = IFC has no shared-data set (replacement board, missing card) and cannot drive the serial ECM or calculate CFM. d4 = card rejected (wrong model card).

6 plates

Too many failed ignition attempts or flame losses on this call.

9 plates

Low-stage pressure switch is made with the inducer off.

7 plates

Inducer is on low and the low-fire switch will not close.

9 plates

Primary limit opened. Airflow or overfire — not a charge problem.

9 plates

Rod sees flame with both solenoids de-energized.

9 plates

3 A (typical) automotive fuse on the IFC is open.

9 plates

Flame is present but the micro-amp signal is below the IFC threshold.

9 plates

IFC did not see the igniter circuit behave as commanded.

9 plates

High-stage pressure switch is made with the inducer not on high.

5 plates

Inducer on high, high-stage switch never closes. Classic ‘runs on low, will not go high.’

7 plates

L1/N reversed or chassis ground missing. Furnace will not operate.

9 plates

Internal (Eb) or external (Ec) gas-valve electrical fault.

4 plates

Manual-reset rollout opened. Treat as flame outside the exchanger until proven otherwise. Door chart may render this as a distinctive 7-seg character — confirm on the unit sticker.

4 plates

No line voltage reaching the IFC, door switch open, or an internal control condition. This is power, not a ComfortBridge data-pair code.

6 plates

IFC failed its ground check (sister to EA).

4 plates

Twinning miswire or twin terminal active on a standalone unit.

2 plates

A heat-kit limit opened or a sequencer did not bring a bank on. There is no gas-furnace E3 on this machine — this is strip overtemp or a failed sequencer/relay.

1 plate

Igniter circuit measures open.

4 plates

Leak / comm / relay alarm from the A2L board when paired with R-32 or R-454B outdoor.

4 plates

Outdoor airflow, overcharge, or restriction opened the high-pressure switch.

4 plates

Still real on an inverter.

1 plate

Compressor hums, outdoor fan may run.

2 plates

idle = standby. CF = continuous fan. 1AC / 2AC = cooling stage. Htr = electric heat staged. These are run states.

1 plate

Normal run states. idle = standby. Ht = heat running (capacity is a percent, not Ht1/Ht2 stages). CF = continuous fan.

2 plates

Normal run states on the triple display. idle = standby. Ht1 / Ht2 = low / high heat. CF = continuous fan. CL1 / CL2 = cooling stage.

3 plates

L5/L4-class faults on the drive.

1 plate

9-speed ECM current too low.

1 plate

ECM current too low (LE1) or unexpected (UE2).

3 plates

Suction dropped out — charge, indoor airflow, or TXV.

2 plates

Charge, indoor airflow, metering.

2 plates

No 24 VAC at the contactor or the coil is open.

2 plates

Twinning miswire or twin terminal active on a standalone unit. Door card lists TWIN on 0140F20001-B.

1 plate