Bradford White Ultra Low NOx D series gas code No light
No status light, unit is not powered
Quick answer
On Bradford White Ultra Low NOx D series gas, No light is a normal display state, not a fault. There is no light on the gas control at all. The power switch on the control is off, the supply has been interrupted, or the unit is unplugged. The burner has not been asked to do anything yet, because the control has not started. A first thing to check: Power switch on the gas control in the OFF position.
- Applies to
- Bradford White Ultra Low NOx D series gas
- Bradford White Ultra Low NOx residential D series gas codes · Water Heater
- Type of code
- Status or setup value
- Urgency: nothing to fix
- First safe check
- Look for the power switch on the gas control inside the outer jacket and confirm it is set to ON.
What No light means on this model
There is no light on the gas control at all. The power switch on the control is off, the supply has been interrupted, or the unit is unplugged. The burner has not been asked to do anything yet, because the control has not started.
Symptoms you will notice
- No light on the gas control, and no pilot flame
- No hot water at any fixture
- Unit was working earlier and is now completely dead
- The breaker for the water heater is off
- A recent power outage or a storm took the unit out
Common causes
The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:
- Power switch on the gas control in the OFF position
- Water heater unplugged or the breaker tripped
- Supply voltage interrupted
- A blown fuse on an older installation
- GFCI or AFCI protection on the water heater circuit that has tripped
What you can safely check
These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.
- Look for the power switch on the gas control inside the outer jacket and confirm it is set to ON.
- Check the breaker or switch serving the water heater and reset it once.
- Check whether the unit is plugged in, which it is on many installations, and confirm the plug is seated.
- If the circuit has ground fault or arc fault protection, look for a tripped device and reset it.
- Confirm there is no power outage affecting the rest of the house before assuming the appliance has failed.
Do not do these
- ×Do not remove the outer jacket while the unit is in service, and do not work inside the burner compartment with the power on.
- ×Do not leave a water heater on a circuit that keeps tripping without finding out why, because a repeat trip can be a sign of a fault that will damage the control.
- ×Do not light the burner by hand to get hot water while the control has no power. The control is what proves a flame is present and closes the gas if it is not.
When to call a technician
Worth scheduling, and worth your own checks first
You can usually keep living with this for a short while, but it will not fix itself. Do the safe checks below first, because a tripped switch or a blocked airflow is a five-minute fix that would otherwise cost you a service call.
- This is a fuel-burning appliance, so treat anything involving a burner, gas valve or flue as technician work. If you smell gas at any point, leave the property and call the gas utility from outside rather than continuing to diagnose.
- If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.
Finding the breaker and reading the switch position is a homeowner task. Anything with the outer jacket off, or replacing the control, is a technician job.
What it costs to fix
Parts
GFCI device $20 to $60. A failed control power switch comes with the control, $150 to $350.
Labor
Ten minutes to reset a breaker or set the switch. One to two hours if the control has to be replaced.
DIY or technician
Finding the breaker and reading the switch position is a homeowner task. Anything with the outer jacket off, or replacing the control, is a technician job.
Typical US part and labor ranges, 2026. They vary by region, model and contractor, so treat them as a planning figure, not a quote.
Scope of this code
- Code table
- Bradford White Ultra Low NOx residential D series gas codes
- Models in scope
- Bradford White Ultra Low NOx D series gas
- Checked
- Confirm on your own unit
- Find the model number on the data plate, then check this code in the service manual for that model. Manufacturers revise code tables between model years, and a revised board can renumber a fault.