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How often is the noise? Is it exactly every 1 or two minuets?
If it is perfectly timed using your watch, than it is a battery of a smoke detector in your home elsewhere.
To be sure, lets also try shutting off the main breaker ( probably 100 or 200 amps breaker marked MAIN). This shuts off ALL power to your home. Do you still hear the beeps?
Trace the beeps and check all smoke and co2 detectors. If not those, it could possible be a battery back up for an house alarm system, Verzion box, or some other device. Please let me know what you find so I can assist further
Unfortunately, company policy does not allow us for live phone calls. However, I am certain we can find your problem.
Please post back your findings.
When a smoke detector battery gets old, the detectors typically emit a beeping sound every moment. The sound willbe more of a chirp then that as you would be testing the unit with the test push button.
I have never seen a light fixture that will beep. Thus at this point I believe its something else.
Is your townhouse only 1 level? If so does it have an attic space? I am wondering if you have a detector in the attic.
Do you feel capable enough to remove the detector from the ceiling? If so, please try and remove the battery and the power cord from the unit.
Next if that does not solve the problem.
Do you feel capable to remove the light fixture from the ceiling? If so, please make sure the power is off.
Lets remove the fixture from the room and see if you still hear the beep in the dining room