What is the beeping sound from on BRadford White Water Heater

need to know model number of bradford white

It is pretty easy - make sure gas valve is open, change control know to pilot. Press the ignitor a few times and once pilot lights up switch control to warm or hot position.

See instructions by downloading manual for MI-403SF6BN from this site
Bradford White Water Heaters Built to be the best

http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Call Bradford White or installer

Gene
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1) Copy following links to identify gas control valve and read ignition procedure, and access service manual for your product:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

2) Honeywell gas control used on recent Bradford White gas water heaters has red knob that rotates to pilot. Press and hold red knob. Then push red igniter button until status light changes.

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Doesn't sound like its the dip tube, its a element problem, I would contact bw directly to see if heater is stil in warranty and they will send you new parts free.

Bradford White:
Bradford white service manuals:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://www.bradfordwhite.com/documentation/residential/gas.asp

Depending on age of water heater, The air intake may need to be cleaned.
Remove combustion parts and use compressed air to clean arrestor screen located bottom of combustion chamber.
Get more fresh air to unit.
Check gas pressure.
Check color of flame, should be clear blue and not lazy yellow.
Install new gas control valve.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Water heaters are a huge field of knowledge. Problem is not 100% clear.
There is a resettable thermal switch on the combustion door. This switch is round and has two wires that come from gas control valve. Thermal switch trips when combustion parts have not been cleaned and they cause overheated condition, or sensor reads temperatures above 180, or thermal switch has gone bad, or gas control has gone bad.
http://waterheatertimer.org/images/Whirlpool-Resettable-ECO-8.jpg
Add a comment with more information for continued help.

1) Bradford White support:
http://www.bradfordwhite.com/supportserv.asp

2) Bradford white mi403s6fbn is 6-year-warranty 40 gallon tank-type gas water heater with Icon electronic gas valve, and atmospheric venting.
Older models have the dial-type Robert Shaw or White Rodgers gas valve.
Open following link to see age of Bradford White:
http://www.bradfordwhite.com/findaserial.asp

3) Bradford white has 'product manuals' and 'service manuals' on following link:
Product manuals have general information and advisories that people can read about water heaters.
Service manuals are for plumbers and technicians, and do-it-yourselfers for testing and repairing water heaters.
http://www.bradfordwhite.com/documentation/residential/gas.asp

4) Typical manual for your product shows different gas valves, lighting instructions, and advisories, and troubleshoot checklist:
http://www.bradfordwhite.com/images/shared/pdfs/manuals/238-44219-00J.pdf

5) Add a comment with following information if you want specific help with servicing water heater.
What are you trying to reset on the water heater?
What are the symptoms, and what have you noticed, and what have you tried so far?
Which gas valve does your water heater have? Please open typical manual and view images of the three basic gas valves.
When was water heater last serviced and cleaned?
How old is water heater?

Take a moment and rate answer:
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Fixya is always less expensive than a service call.

Contact Bradford White and ask which blower is correct:
http://www.bradfordwhite.com/supportserv.asp

Get model number and serial number from label located on side of tank.
This information will help BW find exact information for your product.

replace upper thermostat, and hi temp limit, usually made in one piece, also make sure the new stat is pushed up tight to the tank when you install it.