Bradford White tankless water heater error codes
When a Bradford White Infiniti K or Infiniti L tankless unit detects a problem, it shuts down and displays an error code. That’s the system working as designed — the unit protects itself and your home rather than operating in an unsafe or damaging state.
The code on the display is a starting point, not a repair instruction. Codes point to a category of fault, and the same code can have several underlying causes that only on-site testing can separate. That’s why we focus here on understanding the categories and preparing the right information for your service call, rather than publishing a code-by-code table that invites risky guesswork.
HeatLand Heating & Cooling — licensed, insured, family-run, serving Metro Vancouver and the Fraser Valley since 1999 — diagnoses Bradford White error conditions with TSBC-certified gas fitters. Here’s how to read the situation before we arrive.
The Five Categories of Tankless Error Codes
Nearly every tankless error condition falls into one of five families. Ignition and flame faults mean the unit tried to fire and couldn’t establish or maintain a flame — causes range from gas supply problems to ignition component wear. Overheat and temperature faults mean the unit detected excessive temperatures, and scale buildup on the heat exchanger is a leading cause, since scale creates hot spots and restricts flow. Flow sensor faults mean the unit can’t properly detect water moving through it — sometimes a sensor issue, sometimes a clogged inlet filter or genuinely low flow at the fixture. Venting and combustion-air faults mean the unit detected a problem with exhaust or air intake — blocked terminations, condensate backups on condensing units, or fan issues. Control and communication errors involve the electronics themselves or connections between components. Knowing which family your code belongs to tells you how urgent the situation is and what our technician will investigate first.
What to Record Before You Call
Good information shortens diagnosis. Before calling, write down: the exact code shown on the display, letter-for-letter and digit-for-digit; what was happening when it appeared (mid-shower, first draw of the morning, during cold weather); whether the code clears when the unit resets and then returns, or stays locked out; how old the unit is and when it was last professionally serviced or descaled; and any recent changes — plumbing work, renovations near the venting, a new fixture, unusually cold weather, or a power outage. Also note whether hot water works partially or not at all. If the display shows a history of different codes over recent weeks, mention that too — a pattern of varied codes tells a different story than one repeated fault. This five-minute inventory frequently turns a two-visit repair into a one-visit repair, because our technician arrives with the right diagnostic focus and likely parts.
When an Error Code Is a Safety Situation
Most error codes are inconvenience-level events: the unit locked out, and you need service. A few situations are different. If you smell gas anywhere near the unit — with or without a code on the display — stop what you’re doing, do not operate switches or appliances, leave the building, and call a TSBC-licensed technician and your gas utility from outside. If a carbon monoxide alarm sounds, treat it the same way: leave first, call from outside. Venting-category faults deserve particular respect, because the venting system is what keeps combustion gases out of your living space; repeatedly resetting a unit that keeps throwing vent-related codes is exactly the wrong response. As a rule: one reset is reasonable, repeated resets to force operation past a recurring code is not. The code exists because the unit detected something wrong — let a licensed gas fitter find out what.
Why Code Diagnosis Is Licensed Work in BC
Online forums are full of code lists and reset tricks, and they’re a poor substitute for diagnosis. The same ignition code can mean a gas pressure problem, a component failure, or a venting issue — three different repairs, one of which involves adjusting the gas system. In British Columbia, work on gas-fired appliances requires a TSBC-licensed gas fitter, and error-code diagnosis on a Bradford White tankless almost always crosses into that territory: testing gas pressure, inspecting burners, verifying venting integrity, checking combustion. HeatLand’s technicians carry that certification, and the company is licensed and insured, so the diagnosis is done properly and documented. If the fault turns out to be repair-worthy, you get a written quote; if the unit is at end of life, you get a written replacement option with financing available. Either way, the code becomes an answer instead of a recurring mystery.
Quick Checklist
- Write down the exact error code as displayed
- Note what the unit was doing when the code appeared
- Record whether the code returns after a single reset
- Note the unit’s age and last service or descaling date
- List any recent changes: plumbing work, weather, power outages
- Gas smell or CO alarm: leave the building first, call from outside
| Code Category | What the Unit Detected | Common Underlying Factors |
|---|---|---|
| Ignition / flame | Failed to establish or hold a flame | Gas supply, ignition components, combustion air |
| Overheat / temperature | Excessive temperature in the system | Scale buildup, restricted flow, sensor issues |
| Flow sensor | Cannot properly detect water flow | Clogged inlet filter, sensor fault, low fixture flow |
| Venting / combustion air | Exhaust or intake problem | Blocked termination, condensate backup, fan issue |
| Control / communication | Electronics or wiring fault | Board issues, connections, power quality |
Frequently Asked Questions
Should I keep resetting my Bradford White tankless when it shows an error code?
One reset after a suspected one-off event (like a power blip) is reasonable. If the code returns, stop resetting and book service — the unit is detecting a real condition, and forcing it to run past a recurring fault, especially a venting or overheat code, can turn a repairable problem into a damaged heat exchanger or a safety issue.
Why don’t you list what each Bradford White error code means?
Because the same code can have multiple underlying causes, and the correct response depends on on-site testing of gas pressure, venting, and components — licensed work in BC. Code categories (ignition, overheat, flow, venting, control) are genuinely useful for homeowners; code-by-code self-repair guidance is how gas appliances get unsafe.
My tankless shows a code only in cold weather. What does that suggest?
Cold-weather-only faults often involve the venting or condensate path — for example, ice or blockage at the vent termination, or a condensate line freezing on a condensing unit. Note the weather pattern when you call; it’s a strong diagnostic clue that helps our technician check the right systems first.
What will HeatLand do when they diagnose the error code?
Our TSBC-certified gas fitter reads the code and the unit’s diagnostic history, then tests the implicated systems — gas supply, ignition, flow, venting, condensate — to isolate the actual cause. You receive a clear explanation and a written quote for the repair, or a replacement option with financing if the unit is at end of life.
Reviewed by the HeatLand Heating & Cooling team — licensed HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. Specifications and rebate programs change; confirm current details with a written quote. If you smell gas or suspect carbon monoxide, stop troubleshooting, leave the area, and call a licensed technician or 911.