Rheem R802VA07542117MSA Error Code T013_F: Flame Lost after Established

What Does Code T013_F Mean?

Fault code T013_F on the Rheem R802VA is a troubleshooting-level fault indicating that the flame was established but subsequently lost during a heating cycle. The "T" prefix means this is a single occurrence, not yet severe enough to trigger a lockout.

When the burners are running, the flame sensor continuously monitors flame presence by detecting the microamp current that flows through the flame. If the sensor becomes dirty or corroded, it may detect just enough current to confirm ignition initially, but as conditions change slightly during the heating cycle, the signal drops below the minimum threshold and the control board shuts off gas flow.

Inconsistent gas pressure can also cause this fault. If gas pressure drops briefly during operation — for example, when another gas appliance kicks on — the flame can weaken or extinguish. A cracked heat exchanger is a less common but more serious cause, as it can allow air currents to disrupt the burner flames.

Common Causes

How to Fix It: Clean the Flame Sensor

What You'll Need

• Scotch-Brite pad
• 1/4-inch nut driver or hex-head screwdriver
• Flashlight

Steps

1. 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.
2. 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 pull out the sensor.
3. Clean the flame sensor rod Gently rub the metal rod with a Scotch-Brite pad until it is clean and shiny. Do not use steel wool, as it can leave residue. Avoid bending the rod or touching the cleaned surface with your fingers.
4. Reinstall the flame sensor Reinsert the sensor into its mounting bracket, tighten the screw, and reconnect the wire. Ensure the rod sits in the flame path properly.
5. Restore power and gas, then test Turn the gas supply valve to ON and flip the circuit breaker to ON. Set your thermostat to call for heat and monitor the furnace through several complete heating cycles to confirm the flame stays on.

When to Call a Professional

Contact a licensed HVAC technician if:

• The flame keeps going out after cleaning the flame sensor
• You notice the flame color is yellow or uneven instead of steady blue
• Other gas appliances in your home also show signs of low gas pressure
• The problem only occurs during high-stage operation
• You hear unusual popping or rumbling sounds from the burners

✓ Verified against manufacturer service manual — March 2026