You walk into the garage to grab a tool, and there it is. Your Bradford White water heater is blinking at you. Maybe one slow LED. Maybe a sequence of flashes. Maybe an actual number on a screen.

And right away, your brain jumps to the worst-case price tag.

Take a breath. Most Bradford White error codes point at small, fixable things. A clogged screen. A dirty sensor. A pilot that went out for a perfectly mundane reason. The trick is reading the code right before you reach for the wallet.

Below is a plain-English guide to the most common codes, what they actually mean, and which ones genuinely need a pro.

How Bradford White Codes Work

On most modern residential gas units, the status LED on the gas valve flashes a pattern. One flash, pause, three flashes = code 13. On commercial and tankless models, you’ll see a number on the display.

Different models read codes a little differently. So before anything else, find the silver rating plate on the side of the tank, write down the model number, and pull the matching service manual. Bradford White posts their official service manuals online — the code definitions inside are the only ones that count for your specific unit.

The Most Common Bradford White Error Codes

Code 4 — Flammable Vapor Sensor Lockout

This one’s dramatic. The unit refuses to fire. Code 4 means the FV sensor at the base picked up combustible fumes nearby. Gas? Paint thinner? Lawnmower in the corner? Move it. Open the garage door. Let the area air out.

Reset the unit per the manual once the air clears. If it locks out again with nothing flammable around, the sensor itself is probably bad and needs replacing.

Code 10 and Code 11 — Air Supply Blocked / Ignition Failure

These two like to travel together.

Code 10 means the burner can’t pull in enough air. The mesh screen at the bottom of the tank is your first suspect. Pull the access cover. Vacuum the screen. Done.

Code 11 means the unit tried to light and gave up. If the air screen looks fine, you’re looking at gas supply, igniter, or thermopile issues. That’s where the DIY road usually ends.

Code 13 — Pressure or Flow Issue

Code 13 says water isn’t moving the way it should. Quick checks:

Is your home’s main water on?
Is the inlet valve at the heater fully open?
Has the inlet screen calcified shut?

Hard water is a nuisance across Riverside, Corona, and Jurupa Valley. Sediment and scale love clogging that little inlet screen. A flush usually buys you another year or two before it happens again.

Code 16 — Overheat / High-Limit Trip

The temperature inside the tank climbed too high and the safety switch shut everything down. Two usual reasons. Either the thermostat stuck, or there’s a pile of sediment at the bottom of the tank insulating the burner and creating a hotspot.

If you can’t remember the last time you flushed the heater, that’s your answer.

Code 62 — Ignition Failure With Pilot Lit

This one fools people. The pilot is right there. Visible. Burning. So why won’t the burner turn on?

Code 62 usually means the flame sensor is gunked up and can’t see the pilot anymore. A careful clean with fine emery cloth fixes it most of the time. If not, the gas valve or the control board is next on the list, and that’s plumber territory.

Heat Pump and Tankless Codes

The newer heat pump and tankless Bradford White units have a separate code set. Sensor faults, fan motor errors, condensate drain blockages, and so on. The detailed heat pump error reference has the breakdown if you want to dig in. None of these are great DIY territory.

What’s Safe to Try Before Calling a Plumber

Honest answer? A reset clears more codes than people expect. Standard sequence:

Turn the gas control to “Off.”
Flip the breaker for the unit.
Wait 30 seconds. Yes, the full 30.
Turn the breaker back on.
Turn the gas valve back to “On.”
Let the pilot relight per the lighting label on the unit.

If everything boots clean and the code stays away, you’re good. If the same code returns within an hour, the fault’s real. Don’t keep resetting it. Resetting through a real fault is how small problems become flooded floors.

When You Need a Pro

Don’t try to handle these yourself:

Anything involving the gas valve or gas pressure
Repeated overheat codes after a flush
Hard lockouts (the unit won’t reset, period)
Water on the floor around the base
Any whiff of gas — leave the house, call from outside

Water heaters are one of the appliances where small mistakes get expensive fast. Gas leaks. Scalding burns. Flooded mechanical rooms. According to the U.S. Department of Energy, regular professional maintenance also extends the unit’s life and trims energy bills, which more than pays for the service call over time.

Don’t Forget the Hard Water Factor

Living in the Inland Empire? Your water heater is fighting hard water from the day it gets installed. Calcium and magnesium scale builds up at the bottom of the tank, around heating elements, and inside the inlet screen. That scale is the root cause behind a surprising number of Bradford White error codes, especially the overheat and flow-related ones.

An annual flush is the cheapest insurance you can buy for the unit. Set a calendar reminder for one weekend a year and you’ll add years of life to the heater.

Quick Reference Cheat Sheet

Code	What It Means	First Thing to Check
4	Flammable vapor sensor tripped	Move chemicals, ventilate, then reset
10	Air supply blocked	Clean the air intake screen
11	Ignition failure	Air screen, then gas/igniter
13	Water flow/pressure issue	Inlet valve and inlet screen
16	Overheat / high-limit trip	Flush the tank
62	Pilot lit but burner won’t fire	Clean the flame sensor

Your Riverside Water Heater Repair Pros

If your Bradford White unit is throwing an error code you can’t clear on your own, Rooter King Plumbing serves Riverside, Corona, Jurupa Valley, and Orange County with same-day diagnostics and water heater installation and repair. Contact us today and we’ll send a technician out fast.