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WHIRLPOOL SERIAL CODES
The YEAR of manufacture is indicated by the 2nd digit of the serial number.
The WEEK of manufacture is indicated by the 3rd and 4th digits of the serial number.
Examples:
C50734686 was built in either 1975 or 1985 and in the 7th week.
EF2715205 was built in 1996 and in the 27th week.
Machines "not built by Whirlpool" have an additional letter in the serial number.
Example:
ECF2715205 was built in the 27th week of 1996
1970 0   1980 0   1990 X   2000 K   2010 0
1971 1   1981 1   1991 A   2001 L   2011 1
1972 2   1982 2   1992 B   2002 M   2012 2
1973 3   1983 3   1993 C   2003 P   2013 3
1974 4   1984 4   1994 D   2004 R   2014 4
1975 5   1985 5   1995 E   2005 S   2015 5
1976 6   1986 6   1996 F   2006 T   2016 6
1977 7   1987 7   1997 G   2007 U   2017 7
1978 8   1988 8   1998 H   2008 W   2018 8
1979 9   1989 9   1999 J   2009 Y   2019 9

 

MAYTAG SERIAL CODES
Look at the last two digits of the Serial Number.  Not sure if the later years are accurate since Whirlpool bought them out.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1980 EA EC EE EG EJ EL EN EP ER ET EV EX
1981 GA GC GE GG GJ GL GN GP GR GT GV GX
1982 JA JC JE JG JJ JL JN JP JR JT JV JX
1983 LA LC LE LG LJ LL LN LP LR LT LV LX
1984 NA NC NE NG NJ NL NN NP NR NT NV NX
1985 PA PC PE PG PJ PL PN PP PR PT PV PX
1986 RA RC RE RG RJ RL RN RP RR RT RV RX
1987 TA TC TE TG TJ TL TN TP TR TT TV TX
1988 VA VC VE VG VJ VL VN VP VR VT VV VX
1989 XA XC XE XG XJ XL XN XP XR XT XV XX
1990 BA BC BE BG BJ BL BN BP BR BT BV BX
1991 DA DC DE DG DJ DL DN DP DR DT DV DX
1992 FA FC FE FG FJ FL FN FP FR FT FV FX
1993 HA HC HE HG HJ HL HN HP HR HT HV HX
1994 KA KC KE KG KJ KL KN KP KR KT KV KX
1995 MA MC ME MG MJ ML MN MP MR MT MV MX
1996 QA QC QE QG QJ QL QN QP QR QT QV QX
1997 SA SC SE SG SJ SL SN SP SR ST SV SX
1998 UA UC UE UG UJ UL UN UP UR UT UV UX
2000 WA WC WE WG WJ WL WN WP WR WT WV WX
2001 YA YC YE YG YJ YL YN YP YR YT YV YX
2002 ZA ZC ZE ZG ZJ ZL ZN ZP ZR ZT ZV ZX
2003 AA AC AE AG AJ AL AN AP AR AT AV AX
2004 CA CC CE CG CJ CL CN CP CR CT CV CX
2005 EA EC EE EG EJ EL EN EP ER ET EV EX
2006 GA GC GE GG GJ GL GN GP GR GT GV GX
2007 JA JC JE JG JJ JL JN JP JR JT JV JX
2008 LA LC LE LG LJ LL LN LP LR LT LV LX
2009 NA NC NE NG NJ NL NN NP NR NT NV NX
2010 PA PC PE PG PJ PL PN PP PR PT PV PX
2011 TA TC TE TG TJ TL TN TP TR TT TV TX
2012 VA VC VE VG VJ VL VN VP VR VT VV VX
2013 XA XC XE XG XJ XL XN XP XR XT XV XX
2014                        
2015                        


 

GENERAL ELECTRIC SERIAL CODES
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1980 AG DG FG GG HG LG MG RG SG TG VG ZG
1981 AH DH FH GH HH LH MH RH SH TH VH ZH
1982 AL DL FL GL HL LL ML RL SL TL VL ZL
1983 AM DM FM GM HM LM MM RM SM TM VM ZM
1984 AR DR FR GR HR LR MR RR SR TR VR ZR
1985 AS DS FS GS HS LS MS RS SS TS VS ZS
1986 AT DT FT GT HT LT MT RT ST TT VT ZT
1987 AV DV FV GV HV LV MV RV SV TV VV ZV
1988 AZ DZ FZ GZ HZ LZ MZ RZ SZ TZ VZ ZZ
1989 AA DA FA GA HA LA MA RA SA TA VA ZA
1990 AD DD FD GD HD LD MD RD SD TD VD ZD
1991 AF DF FF GF HF LF MF RF SF TF VF ZF
1992 AG DG FG GG HG LG MG RG SG TG VG ZG
1993 AH DH FH GH HH LH MH RH SH TH VH ZH
1994 AL DL FL GL HL LL ML RL SL TL VL ZL
1995 AM DM FM GM HM LM MM RM SM TM VM ZM
1996 AR DR FR GR HR LR MR RR SR TR VR ZR
1997 AS DS FS GS HS LS MS RS SS TS VS ZS
1998 AT DT FT GT HT LT MT RT ST TT VT ZT
2000 AZ DZ FZ GZ HZ LZ MZ RZ SZ TZ VZ ZZ
2001 AA DA FA GA HA LA MA RA SA TA VA ZA
2002 AD DD FD GD HD LD MD RD SD TD VD ZD
2003 AF DF FF GF HF LF MF RF SF TF VF ZF
2004 AG DG FG GG HG LG MG RG SG TG VG ZG
2005 AH DH FH GH HH LH MH RH SH TH VH ZH
2006 AL DL FL GL HL LL ML RL SL TL VL ZL
2007 AM DM FM GM HM LM MM RM SM TM VM ZM
2008 AR DR FR GR HR LR MR RR SR TR VR ZR
2009 AS DS FS GS HS LS MS RS SS TS VS ZS
2010 AT DT FT GT HT LT MT RT ST TT VT ZT
2011 AV DV FV GV HV LV MV RV SV TV VV ZV
2012 AZ DZ FZ GZ HZ LZ MZ RZ SZ TZ VZ ZZ
2013                        
2014                        
2015