Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of HVAC equipment. Anytime anyone is dealing with numbers and letters in determining data, mistakes and misinterpretation are bound to happen. For this reason if you find during your research that we may have erred please contact us. In addition perhaps you have come across a brand, model or serial number format that we have not addressed. Email us information or pictures of data/nomenclature plates of the unit and we will attempt to assist you in your determinations. Email
This page was last updated: 25 July 2009
Heat Controller
Serial Number format: 28903 160610
(This serial number is from an actual furnace unit transcribed during a home inspection).
Using the second, third, fourth and fifth digits of the serial number 28903 160610 you will find the year and month of manufacture. The second and third digits are the year and the fourth and fifth digits are the month. This unit was manufactured in March 1989.
Year of manufacture: 28903 160610
Month of manufacture: 28903 160610