Rheem R802VA07542117MSA Error Code A114_F: One-hour Lockout: Flame Lost Failure

What Does Code A114_F Mean?

Your two-stage, variable-speed R802VA07542117MSA lights its burners and then depends on the Bluetooth Communicating IFC (Integrated Furnace Control) to keep proving the flame throughout the burn using the flame sensor rod. Each time the flame signal drops out mid-burn during one thermostat call, the control relights and counts the event. Code A114_F is the one-hour lockout the IFC imposes once the flame has been lost five times in that same heat call. During the lockout the furnace will not relight regardless of the thermostat until the hour expires or power is cycled.

A114_F is the lockout side of the event the control logs as A013_F. A013_F is the alarm-level fault recorded when flame is lost five times in one call; A114_F is the one-hour safety lockout that follows. Because they share a root cause, they share a fix. The most common cause is a dirty or weak flame sensor rod: a coating of oxide or soot lets the flame current drift below the detection threshold during the burn, so the furnace repeatedly relights and loses the flame until the five-strike counter trips. Inconsistent gas pressure and, less commonly, a cracked heat exchanger disturbing airflow across the burners can also cause repeated flame loss, but those require a technician.

A114_F is different from the ignition-failure lockout A113_F on this board. A113_F means a flame was never confirmed across four ignition trials, so the furnace never lit. A114_F always means the burner did light each time and the flame was then lost during the burn, so the problem is holding the flame rather than starting it. It is the lockout that the milder T013_F flame-loss code escalates into when flame loss keeps repeating.

What You'll Notice

• The furnace lights and warms up briefly, but the flame keeps cutting out and relighting before it finally shuts down
• The alphanumeric LED blinks "A114_F" one digit at a time with a roughly three-second pause between digits
• After several flame losses the furnace stops trying and delivers no heat for about an hour
• The furnace ignores the thermostat during the one-hour lockout, then attempts to run again on its own
• You may hear the burners cycle on and off repeatedly during the failing heat call

Common Causes

How This Is Diagnosed

Because A114_F only follows a flame that was repeatedly established and lost, the first homeowner check is the flame sensor rod, since a dull gray or blackened coating is the most common reason the flame signal keeps drifting below the detection threshold mid-burn. If the rod is already clean and the one-hour lockout keeps returning, the cause is more likely fluctuating gas pressure or an airflow disturbance across the burners, which a technician confirms with a manometer and combustion instruments.

How to Fix It: Clean the Flame Sensor to Stop the Flame-Loss Lockout

What You'll Need

• Scotch-Brite pad
• 1/4-inch nut driver or screwdriver
• Flashlight
• Clean, dry cloth

Steps

1. Shut off power and gas before opening the furnace Turn off electrical power to the furnace at the breaker or the switch on or near the unit, and turn the manual gas shutoff valve to the OFF position. If you smell gas, leave immediately and call your gas company.
2. Open the burner compartment and find the flame sensor Remove the furnace's lower access panel to reach the burner compartment. The flame sensor is the thin metal rod with a white porcelain base mounted at the burner, secured with a single screw, with its tip positioned in the flame path.
3. Clean the flame sensor rod Gently clean the flame sensor rod with a Scotch-Brite pad until the metal is dull-bright. Rheem's guide lists fine steel wool as the cleaning material, but many HVAC technicians prefer a Scotch-Brite pad because it leaves no abrasive residue on the rod. Do not clean or scratch the white porcelain base, and take care not to bend the rod.
4. Wipe the rod and reinstall it Wipe the cleaned rod with a clean, dry cloth to remove any loosened residue, then reinstall it in its original position and orientation so the tip sits back in the flame path, and snug up the single mounting screw.
5. Restore power, clear the lockout, and watch a full cycle Reinstall the access panel, turn the gas valve back on, and restore electrical power, which also clears the one-hour lockout. Set the thermostat to call for heat and watch the burner run through a complete cycle without the flame dropping out or the LED reporting A114_F again.

When to Call a Professional

Contact a licensed HVAC technician if:

• The one-hour A114_F lockout keeps returning after the flame sensor has been cleaned
• The furnace repeatedly relights and loses the flame even with a clean sensor rod
• The flame visibly flickers, roars, or lifts off the burners rather than burning steadily
• You notice soot, a yellow or lazy flame, or unusual smells around the furnace
• You smell gas at any point near the furnace or gas piping

✓ Verified against manufacturer service manual — March 2026