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Error code reference

Amana Furnace Error Code 2 Flashes

Pressure switch stuck closed

Amana codesAmana furnace codes

Pressure switch stuck closed - pressure switch circuit is closed even though the induced draft blower is not operating.

First step from the service manual

Check for shorted wiring or replace pressure switch.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 2 Flashes means on a Amana furnace

The 2 Flashes error code on an Amana furnace indicates a pressure switch stuck closed condition. Under normal furnace operation, the pressure switch is an open circuit at rest and only closes when the induced draft blower creates sufficient negative pressure (draft) in the flue system. When the control board detects that the pressure switch circuit is already closed before the induced draft blower has been commanded to run, it flags this fault and halts the ignition sequence to prevent unsafe operation.

The pressure switch is a safety device designed to confirm that proper venting airflow exists before allowing the furnace to fire. It uses a diaphragm connected to a hose port on the inducer housing. When suction is present, the diaphragm deflects and closes the switch contacts. If the switch contacts are welded shut, the wiring is shorted, or moisture has compromised the switch internals, the control board will read a closed circuit without any blower activity, triggering the 2 Flashes code.

The most direct diagnostic approach is to inspect the wiring between the pressure switch and the control board for any shorts, pinched conductors, or unintended contact between wires. If the wiring checks out, the pressure switch itself is likely faulty with contacts that are mechanically or electrically stuck in the closed position. Replacing the pressure switch is the standard resolution when wiring is confirmed to be intact.

Source: manufacturer service documentation.

Common causes of 2 Flashes

  1. 01

    Shorted pressure switch wiring

    Wiring / connection

    A pinched, chafed, or unintentionally bridged wire in the pressure switch circuit can cause the control board to read a closed switch at all times. Inspect the wire harness between the pressure switch and the control board for any signs of damage or contact with other conductors.

  2. 02

    Faulty pressure switch with welded contacts

    Part replacement

    The internal contacts of the pressure switch can weld or stick in the closed position due to age, moisture, or electrical arcing. This is confirmed by disconnecting the switch and measuring continuity across its terminals with a multimeter; a good open switch should show no continuity at rest.

  3. 03

    Moisture or condensation inside the pressure switch

    Part replacement

    Water that has migrated through the pressure switch hose or accumulated inside the switch body can bridge the internal contacts and hold them closed. Check the hose and switch body for signs of water intrusion.

  4. 04

    Incorrectly wired pressure switch circuit

    Wiring / connection

    A miswired connection, such as from a previous repair attempt, can create a constant closed-circuit condition. Verify that all wiring connections match the correct terminal designations on both the switch and the control board.

  5. 05

    Failed control board falsely reading switch state

    Part replacement

    In rare cases, a fault on the control board itself causes it to misread the pressure switch input as closed regardless of actual switch status. This is considered only after the switch and all wiring have been confirmed to be in good condition.

See the test procedure for each cause

Frequently asked questions about 2 Flashes

What does 2 Flashes mean on a Amana furnace?
Two flashes on an Amana furnace indicates a pressure switch stuck closed fault. This means the control board is detecting a closed pressure switch circuit even though the induced draft blower has not yet started its cycle. The furnace locks out of ignition as a safety precaution until the condition is resolved.
Can I fix a 2 Flashes error on my Amana furnace myself?
A knowledgeable DIYer can check the wiring between the pressure switch and control board for obvious shorts or damage, which requires no parts and may resolve the fault. However, confirming a faulty pressure switch requires a multimeter to test contact continuity, and replacing the switch involves working near gas and electrical components. If you are not comfortable with these tasks, a licensed HVAC technician is recommended.
Is a 2 Flashes error on an Amana furnace a safety concern?
Yes, this fault causes the furnace to shut down and refuse to fire, which is intentional protective behavior. The furnace will not attempt ignition while the fault is active, so there is no immediate risk of combustion or gas release from this specific code. However, the furnace will not provide heat until the fault is cleared, which can be a concern in cold weather.
How much does it cost to repair a 2 Flashes error on an Amana furnace?
If only a wiring short is found and corrected, repair costs may be limited to a service call fee, typically in the range of $75 to $150. If the pressure switch requires replacement, parts generally cost between $20 and $80 depending on the specific model, plus labor. Control board replacement, if needed in rare cases, can range from $200 to $600 or more including parts and labor.
Will resetting my Amana furnace clear the 2 Flashes error code?
Resetting the furnace by cycling the power may temporarily clear the fault code and allow the furnace to attempt a new startup sequence. However, if the underlying cause such as a shorted wire or a failed pressure switch is still present, the 2 Flashes code will return quickly. A lasting fix requires identifying and correcting the root cause before the furnace will operate reliably.

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