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

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.

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.

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.

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.

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.