On a Bradford White water heater, a 6-2 Error Code (six flashes, followed by a two-second pause) indicates a “Flame Loss During Cycle.” In plain English, your water heater successfully ignited the burner, but then the control system lost the signal confirming the flame was still present, forcing a safety shutdown.
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Listen, I’ve seen this a hundred times. You’re likely standing in a cold shower or wondering why the water is only lukewarm while the unit clicks and whirrs in the basement. It’s a common headache, but before you call a pro and drop $300 on a service call, know that this is often caused by simple maintenance issues you can handle yourself. We’re going to get that pilot and burner stabilized right now.
Symptoms of Error 6-2
The most obvious sign is the status light on the Honeywell or Bradford White gas control valve blinking six times, pausing, and repeating. However, you’ll notice physical signs before the lockout occurs. You might hear the burner roar to life, only to hear it “click” and shut off after a few seconds or minutes. This often leads to “cycling,” where the heater tries to relight multiple times before giving up and throwing the code. Other symptoms include inconsistent water temperatures—hot one minute, cold the next—and a noticeable smell of unburnt gas if the unit is struggling to maintain its combustion cycle.
Troubleshooting & Replacement Instructions
Troubleshooting & Replacement Instructions
Follow these steps in order. We’re going from the easiest, most likely fix to the more complex hardware issues. Safety First: Shut off the gas supply and unplug the unit (if it’s a power-vent model) before opening any panels.
Step 1: Inspect and Clean the Flame Sensor
Locate the burner access panel at the bottom of the tank. Remove the screws using your Phillips head screwdriver and carefully pull back the manifold door assembly. You’ll see the pilot tube, the igniter, and a thin metal rod—that’s your flame sensor. If it looks black or crusty, it’s dirty. Use your fine steel wool or sandpaper to gently buff the rod until the bare metal shines. Warning: Do not use heavy-grit sandpaper, as deep scratches will cause carbon to build up even faster in the future.
Step 2: Check for “Flame Lifting”
Reassemble the door (ensure the gasket is tight) and turn the unit back on. Watch the flame through the sight glass. It should be a steady, crisp blue. If the flame is “dancing” or jumping away from the burner tray, you have an airflow issue. Check the bottom of the heater for lint and dust. Use a vacuum or a soft brush to clean the arrestor plate (the air intake) at the very bottom of the unit. If the flame can’t breathe, it won’t stay lit.
Step 3: Test for Proper Grounding
If the burner stays lit but the 6-2 code persists, pull out your multimeter. Set it to the Ohms (Ω) setting. Touch one probe to the green ground wire on the gas valve and the other to a clean copper pipe. You should see a reading near zero. If you have high resistance, the “flame signal” is getting lost in the wiring. Ensure all wire nuts are tight and the outlet is properly grounded.
Step 4: Measure the Flame Signal (Advanced)
Set your multimeter to DC Microamps (µA). You’ll need to wire the meter in series with the flame sensor wire. A healthy Bradford White signal is usually between 2.0 and 5.0 microamps. If the burner is roaring and you’re getting less than 1.0 µA after cleaning the sensor, the control board inside the gas valve is likely shot and the whole valve assembly needs replacement.
Safety Warning: If at any point you smell gas that lingers, or if the burner “whumps” (delayed ignition), shut the gas off immediately and call a licensed plumber. Do not mess with gas manifold pressures unless you have a manometer and know how to use it.
- Difficulty: Intermediate — Requires basic hand tools and a steady hand.
- Estimated Time: 45 to 90 minutes.
- Tools Needed: Phillips head screwdriver, 1/4″ nut driver, fine-grit sandpaper or steel wool (0000 grade), and a digital multimeter.
- Estimated Cost: $0 (if cleaning is required) to $120 (if the gas valve or sensor needs replacement).
Why is my Bradford White showing Error 6-2 Flashes?
Why is my Bradford White showing Error 6-2 Flashes?
In my thirty years under these tanks, I’ve learned that a “Flame Loss” isn’t usually a catastrophic failure; it’s the computer being overly cautious. Here is why it’s tripping:
1. Carbon Buildup on the Flame Sensor: This is the #1 culprit. The flame sensor (or rod) sits right in the fire. Over time, it develops a thin layer of carbon or silica oxidation. This “soot” acts as an insulator, preventing the tiny electrical current (rectification) from reaching the control board. The board thinks the flame died, even if it’s burning bright blue.
2. Unstable Gas Pressure: If your gas regulator is failing or if you have too many gas appliances running at once, the manifold pressure can drop. A flickering flame might move away from the sensor for just a millisecond, but that’s all the sensor needs to trigger a 6-2 shutdown.
3. Electrical Grounding Issues: Most folks don’t realize that flame sensing requires a solid electrical ground. If your water heater isn’t properly grounded to the house’s electrical system, the “microamp” signal that confirms the flame won’t have a path to return. This is common in older homes with updated heaters.
4. Air Intake or Venting Obstructions: If the burner is “starving” for oxygen because the intake screen is clogged with dust or a bird’s nest is in the vent, the flame will “lift” off the burner. When the flame lifts, it stops touching the sensor, and the system kills the gas for safety.
How to Prevent Error 6-2 Flashes
Don’t want to be back down here in six months? Do these three things:
1. Annual Combustion Cleaning: Once a year, take a vacuum to the bottom air intake. Dust is the silent killer of water heaters. If the heater can’t pull air, the flame gets “dirty” and coats the sensor in soot.
2. Install a Dedicated Surge Protector: These modern Honeywell gas valves are essentially computers. A small power surge can scramble the logic board, leading to false 6-2 or 6-1 codes. A simple $15 plug-in protector can save you a $200 valve.
3. Monitor Your Venting: Check the exterior vent termination once a season. Ensure no bushes have grown over it and no wasps have built nests inside. Backdrafting is a primary cause of flame loss during the cycle.
Frequently Asked Questions
Q: Can I just bypass the flame sensor?
A: Absolutely not. That sensor is the only thing stopping your house from filling with gas if the flame goes out. Bypassing safety controls is a recipe for an explosion. Clean it or replace it, but never bypass it.
Q: I cleaned the sensor but the 6-2 code came back. What now?
A: If the sensor is clean and the grounding is good, the issue is likely the Gas Control Valve (the big box with the knob). The internal relay that interprets the flame signal may have failed. At this point, replacing the valve is the industry-standard fix.
Q: Does a 6-2 error mean my tank is leaking?
A: No. A 6-2 error is strictly an ignition and combustion signal issue. It has nothing to do with the integrity of the inner glass-lined tank. Your tank is likely fine; your “brain” and “eyes” (the valve and sensor) are just miscommunicating.