Weird sound after blower motor turns off

[repoman7575]

Hi. I have a Bradford White hot water heater, model M-2-TW-75T6BN. It's about 15 years year old. No problems ever, works fine.

However, I recently noticed a pinging sound, I think from one of the pipes leading in or out of the hot water, after the water heater heats up and the blower motor turns off. It happens about 5 seconds after the blower turns off. Sounds like someone takes a hammer to a copper pipe. Then that's it.

Just wondering if this is normal, nothing to worry about, or some serious issue.

I recorded the sound on a video but not sure how I can attach here?

 

[Terry]

Hi. I have a Bradford White hot water heater, model M-2-TW-75T6BN. It's about 15 years year old. No problems ever, works fine.

However, I recently noticed a pinging sound, I think from one of the pipes leading in or out of the hot water, after the water heater heats up and the blower motor turns off. It happens about 5 seconds after the blower turns off. Sounds like someone takes a hammer to a copper pipe. Then that's it.

Just wondering if this is normal, nothing to worry about, or some serious issue.

I recorded the sound on a video but not sure how I can attach here?

If you upload to something like Facebook, youtube or vimeo, you can then post the like using the media button above.

 

[Sponsor]

 

[repoman7575]

If you upload to something like Facebook, youtube or vimeo, you can then post the like using the media button above.

Thanks, I uploaded to youtube.

 

[Fitter30]

Sounds metal there is a baffle that is sheet metal that runs down the flue to slow down the flue gas to make heater more efficient. Look at #12 should pull out top after fan assembly removed. Looking for cracks in it.
https://s3.amazonaws.com/bradfordwh...der_prior_naeca_archived_partslist_45861h.pdf