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Error code reference

Amana Furnace Error Code Continuous Flashing

Flame sensed with no call for heat

Amana codesAmana furnace codes

Flame sensed with no call for heat - flame detected when gas valve is de-energized.

First step from the service manual

Correct short at flame sensor or in flame sensor wiring; check for lingering burner flame; verify proper operation of gas valve.

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

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What Continuous Flashing means on a Amana furnace

The Continuous Flashing LED status code on an Amana furnace indicates that the control board is detecting a flame signal through the flame sensor circuit when the gas valve has been de-energized and there is no active call for heat. Under normal operation, the flame sensor should only produce a microamp signal when the burner is actively lit during a heating cycle. When the control board reads this signal outside of a commanded heating cycle, it logs the fault and enters a lockout or alert state to prevent uncontrolled combustion.

This condition points to one of two general problem categories: an electrical fault in the flame sensor circuit, or an actual physical flame that persists after the gas valve closes. A short circuit in the flame sensor wiring or at the sensor rod itself can create a false positive signal on the sensing circuit, making the board believe a flame is present when none exists. This is often caused by damaged insulation on the sensor wire making contact with the burner housing or another grounded surface.

The other possibility is a gas valve that is not fully closing, allowing residual gas flow that keeps the burner lit after the heating cycle ends. A gas valve that leaks internally or fails to seat properly after de-energization is a serious safety concern and requires immediate attention. Diagnosing this code involves inspecting the flame sensor rod and its wiring for shorts or grounding faults, observing the burner assembly after a cycle ends to confirm the flame extinguishes promptly, and testing gas valve operation to ensure it closes completely when de-energized.

Source: manufacturer service documentation.

Common causes of Continuous Flashing

  1. 01

    Shorted flame sensor wiring

    Wiring / connection

    If the insulation on the flame sensor wire is cracked or abraded and the wire is contacting the burner housing or any grounded metal surface, it creates a false signal on the sensing circuit. Inspect the wire along its entire length for damage and check that the connector at the sensor rod is clean and seated correctly.

  2. 02

    Grounded or fouled flame sensor rod

    Wiring / connection

    Carbon buildup or physical contact between the sensor rod and the burner can short the rod to ground and produce a continuous voltage reading on the sense circuit. Remove the sensor and inspect the ceramic insulator for cracks and the rod for heavy oxidation or debris.

  3. 03

    Faulty gas valve not fully closing

    Part replacement

    A gas valve that fails to seat properly when de-energized can allow continued gas flow, keeping the burner lit after the cycle ends. If the burner flame remains visible after the call for heat ends, the gas valve must be replaced.

  4. 04

    Failed control board

    Part replacement

    In some cases, an internal fault on the control board causes it to misinterpret the sense circuit signal even when no actual wiring or sensor fault is present. This is typically diagnosed after all other causes have been ruled out.

See the test procedure for each cause

Frequently asked questions about Continuous Flashing

What does Continuous Flashing mean on a Amana furnace?
Continuous Flashing on an Amana furnace means the control board is detecting a flame signal when the gas valve is de-energized and there is no active call for heat. This is an abnormal condition because the flame sensor should only read a signal during an active, commanded heating cycle. The fault points to either a short in the flame sensor wiring, a faulty sensor rod, or a gas valve that is not closing fully after the heating cycle ends.
How do I fix the Continuous Flashing error on my Amana furnace?
Start by inspecting the flame sensor wiring for any bare spots or areas where the wire contacts grounded metal, and check the sensor rod and its ceramic insulator for damage or carbon buildup. If the wiring and sensor check out, observe the burner after a heating cycle ends to confirm the flame shuts off promptly. If the flame continues burning after the gas valve is de-energized, the gas valve itself needs to be replaced by a qualified technician.
Is a Continuous Flashing code on an Amana furnace a safety concern?
Yes, this fault code can indicate a genuine safety issue. If the root cause is a gas valve that is not closing completely, the burner may remain lit in an uncontrolled state, which poses a combustion and carbon monoxide risk. If you observe a flame that does not extinguish after the heating cycle ends, shut the furnace off and contact a qualified technician before operating it again.
Will resetting my Amana furnace clear the Continuous Flashing error?
A power reset may temporarily clear the error and allow the furnace to run again, but it will not fix the underlying problem. If the short in the wiring, the faulty sensor, or the failing gas valve is not repaired, the condition will return and the fault code will reappear. Resetting without diagnosis only delays addressing what could be a safety-related issue.
How much does it cost to repair a Continuous Flashing error on an Amana furnace?
Repair costs vary depending on the root cause. Correcting a wiring short or cleaning and reseating the flame sensor is relatively inexpensive, typically ranging from $75 to $200 for a service visit if no parts are needed. Replacing a gas valve is significantly more involved, with parts and labor costs often ranging from $300 to $600 or more depending on the technician and part availability.

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