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Error code reference

Atwood Refrigerator Error Code CHECK ON + GAS ON (Flame Detect)

Flame detect circuit offset is too high; detected at power up; 240ms beeper.

Atwood codesAtwood refrigerator codes

Flame detect circuit offset is too high; detected at power up; 240ms beeper.

First step from the service manual

Check flame detection circuit and ignitor electrode connections at J14.

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

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What CHECK ON + GAS ON (Flame Detect) means on a Atwood refrigerator

The CHECK ON + GAS ON (Flame Detect) error on an Atwood refrigerator indicates that the flame detection circuit is reading an offset voltage that exceeds the acceptable threshold at the moment power is applied to the unit. This is a power-up self-diagnostic condition, meaning the control board checks the flame sense circuit before any ignition sequence begins. If the offset is already too high before gas is ever introduced, the board interprets this as a fault in the sensing circuit itself rather than an actual flame condition. The 240ms beeper signal is the audible indicator tied specifically to this fault code.

The flame detection circuit works by measuring a small electrical signal from the ignitor electrode that confirms whether a flame is present during gas operation. When the circuit offset drifts too high due to contamination, carbon buildup, moisture ingress, or a wiring fault, the board cannot establish a valid baseline at startup. The connector at J14 is the primary interface point for the flame detection circuit and the ignitor electrode assembly, making it the first location to inspect for loose pins, corrosion, or damaged wiring.

Common root causes include a contaminated or grounded ignitor electrode, a cracked electrode insulator that allows current to leak to ground, compromised wiring in the harness leading to J14, or a control board that has developed a fault in the flame sense input circuitry. Moisture in the burner compartment can also elevate leakage current enough to push the offset reading beyond the acceptable threshold at power up.

Source: manufacturer service documentation.

Common causes of CHECK ON + GAS ON (Flame Detect)

  1. 01

    Contaminated or carbon-fouled ignitor electrode

    Wiring / connection

    Carbon deposits or grease buildup on the ignitor electrode can create a conductive path that elevates the flame sense circuit offset. Inspect the electrode tip and ceramic insulator for visible fouling or tracking marks.

  2. 02

    Loose or corroded connector at J14

    Wiring / connection

    The J14 connector is the direct interface for the flame detection circuit. A loose pin, corroded terminal, or partially seated connector can introduce resistance or leakage that drives the offset reading too high at power up.

  3. 03

    Cracked or damaged electrode insulator

    Part replacement

    If the ceramic insulator on the ignitor electrode is cracked, current can leak to the burner assembly ground, causing a falsely elevated flame sense signal. Look for visible cracks or chips in the ceramic body around the electrode.

  4. 04

    Damaged wiring harness between electrode and J14

    Part replacement

    Chafed, pinched, or moisture-exposed wiring in the harness running from the ignitor electrode to connector J14 can produce leakage current that the control board reads as an excessive circuit offset. Trace the harness for insulation damage.

  5. 05

    Control board flame sense input fault

    Part replacement

    If the electrode, insulator, and wiring all check out correctly, the flame sense input circuitry on the control board itself may have failed. This is less common but should be considered after all external components are ruled out.

See the test procedure for each cause

Frequently asked questions about CHECK ON + GAS ON (Flame Detect)

What does CHECK ON + GAS ON (Flame Detect) mean on a Atwood refrigerator?
This error means the control board detected that the flame sense circuit offset was too high at the moment the unit powered on. The board runs a self-check before attempting ignition, and if the flame detection signal is already out of range, it triggers this fault with a 240ms beeper pattern. It indicates a problem with the flame detection circuit, the ignitor electrode, or the wiring connecting them at connector J14.
How do I fix the CHECK ON + GAS ON (Flame Detect) error on my Atwood refrigerator?
Start by inspecting the ignitor electrode and its ceramic insulator for carbon fouling, cracks, or physical damage. Next, check the J14 connector for loose pins, corrosion, or moisture. If the electrode and connector appear sound, trace the wiring harness from the electrode to J14 for any chafing or insulation damage. If all external components are intact, the control board may need to be tested or replaced.
Is it safe to use my Atwood refrigerator when this error is displayed?
The unit will not operate on gas while this fault is active, which prevents uncontrolled gas flow. However, you should address the fault before relying on the refrigerator for food storage, as it will not provide proper cooling in gas mode. If you detect any smell of gas near the appliance, shut off the gas supply and ventilate the area before attempting any inspection.
Will resetting the Atwood refrigerator clear this error code?
Because this fault is detected at power up during the board's self-diagnostic routine, simply resetting or cycling power is unlikely to clear it unless the underlying circuit issue is resolved first. The offset check runs every time the unit powers on, so the error will return immediately if the flame sense circuit is still reading out of range.
How much does it cost to repair the CHECK ON + GAS ON (Flame Detect) error on an Atwood refrigerator?
Repair costs vary depending on the root cause. Cleaning the ignitor electrode or reseating the J14 connector involves no parts cost and only labor time. Replacing a damaged electrode assembly typically ranges from $20 to $60 in parts. If the control board requires replacement, parts costs generally range from $150 to $350 or more, plus labor if a technician performs the work.

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