The first five numbers of the serial number of most Hayward Century pump motors manufactured since 2006 indicate the date of manufacture, with the first three numbers being the day of the year, and the fourth and fifth numbers are the year. So the serial number shown above means the motor was produced on the 12th day of 2019. And the one below was manufactured of the 8th day of 2016.

    VGreen variable speed motor serial numbers will begin with the letter “S”. So “S215170000012” would translate to the 215th day of 2017.

   There are also two older serial number systems. The first is a “Plant-Month-Year” code sequence. So “7C98” means it was manufactured at plant number 7, on March (A = January, B = February, etc.), 1998. 

    And the second is a “Year-Month” 3-digit code sequence, where the two letters from the list below indicate year of manufacture, and the number following them indicates month (1 = January, 2 = February, etc.). So BM6 would be June, 1994.

BA = 1983, BB = 1984, BC = 1985, BD = 1986, BE = 1987, BF = 1988, BG = 1989, BH = 1990, BJ = 1991, BK = 1992, BL = 1993, BM = 1994, BN = 1995, BP = 1996, BR = 1997, BS = 1998, BT = 1999, BU = 2000, BW = 2001, BX = 2002, BY = 2003, BZ = 2004, CA = 2005, CB = 2006, CC = 2007, CD = 2008, CE = 2009, CF = 2010

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Here’s links to a collection of our blog posts about POOL AND SPA:

• Does an above-ground pool require a building permit? 

• Does an above-ground pool have to comply with code requirements for a swimming pool barrier?

• What are the pros and cons of vinyl liner vs fiberglas vs concrete in-ground pools? 

• Can a pool with green, cloudy water be inspected?

• Should I refinish-resurface my pool with paint or plaster?

• Why are pool pumps now required to be variable speed? 

• What are the clearance requirements for an overhead electric service drop that is directly over or near a swimming pool?

    Visit our POOL AND SPA page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.