Tenant complaining of noisy pipes

[Michael Nahm]

My tenant just moved into a condo I own a couple weeks ago and is complaining about tapping sounds from the baseboard heating.

From what I understand, it is typical noise culminating from the pipes retracting and expanding. 

Do I have an obligation to fix it or should I politely tell him that the noise is part of the heating system?

[Max T.]

You should bleed the radiators and see if that helps.