Rheem R802VA07542117MSA Error Code A114_F: One-hour Lockout: Flame Lost Failure
What Does Code A114_F Mean?
Fault code A114_F on the Rheem R802VA indicates a one-hour lockout caused by repeated flame loss. The furnace successfully ignited five separate times during a single heating cycle, but the flame was lost each time. After the fifth flame loss, the control board locks out the furnace for one hour.
This code is the lockout-level escalation of A013_F (Flame Lost after Established). Each time the flame goes out, the control board shuts off the gas valve, waits briefly, then attempts to re-ignite. When this cycle repeats five times, the control board determines the problem is persistent and locks out to prevent further cycling.
A dirty flame sensor is the most common cause. The sensor may detect enough current to initially confirm flame, but the marginal signal drops below threshold as conditions shift during the heating cycle. Fluctuating gas pressure and a cracked heat exchanger are less common but more serious causes that can produce the same symptom.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Dirty flame sensor with marginal flame current | Most common | ✓ DIY fix → |
| Fluctuating gas pressure | Common | ✗ Call a pro → |
| Cracked heat exchanger | Uncommon | ✗ Call a pro → |
How to Fix It: Clean the Flame Sensor
What You'll Need
Steps
- Turn off power at the breaker or power switch AND shut off the gas supply valve Locate the furnace circuit breaker and flip it to OFF. Turn the gas shutoff valve to the OFF position (perpendicular to the pipe). If you smell gas, leave immediately and call your gas company.
- Locate and remove the flame sensor Open the furnace access panel. The flame sensor is a thin metal rod near the burners, held by a single screw. Disconnect the wire and remove the mounting screw to extract it.
- Clean the flame sensor rod thoroughly Gently but thoroughly clean the entire metal rod surface with a Scotch-Brite pad until it is clean and shiny. Since this is a recurring flame loss issue, make sure no oxidation or carbon remains. Do not use steel wool, as it can leave residue.
- Reinstall the flame sensor Reinsert the sensor, tighten the screw, and reconnect the wire. Verify the rod is positioned correctly in the burner flame path.
- Restore power and gas, then wait for lockout to clear Turn the gas supply valve to ON and flip the circuit breaker to ON. Wait for the one-hour lockout to expire, or reset by cycling the power off for 30 seconds and back on. Set your thermostat to call for heat and monitor through several complete heating cycles.
When to Call a Professional
Contact a licensed HVAC technician if:
- The A114_F lockout keeps recurring after cleaning the flame sensor
- The burner flames appear yellow, uneven, or are flickering during operation
- You hear popping or rumbling noises from the burner area
- Other gas appliances in the home show signs of pressure fluctuation
- The problem started suddenly without any maintenance changes
Sources
✓ Verified against manufacturer service manual — March 2026