I'm moving back to Pattaya after a long stay in Phuket. I read that I'm supposed to go to immigration in Jomtien and inform them of my new address within 24 hours. If i don't I could get a 5000 baht fine. Is that correct?

Yes the law says that but very few Immigration Offices know and enforce this.

I tried this a few years ago in Samui and they had no idea and the form was filed in the bin.

http://www.thaivisa.com/forum/files/file/15-tm28-form-for-aliens-to-notify-their-change-of-address-or-their-stay-in-the-province-over-24-hours/

Thanks for the TM28 Litebeer..I think I can sleep tonight..

If you are staying somewhere that no one else is responsible for doing the reporting, you are supposed to do it yourself. For example, staying in a condo that you own.

Up to you. It's painless enough and they will re-start your 90 day clock for reporting.

By law you are required to do yourself regardless of where you are living when here on a non immigrant entry. But as said this is not actively enforced by most (not enough manpower) so next 90 day report is normally what is suggested. Landlord reporting is a different report.

It's painless enough and they will re-start your 90 day clock for reporting.

When I filed a TM.28 here in Hua Hin, it did not affect the timing of my next 90-day report.