# Date code For Armstrong Furnace

**URL:** <https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619>\
**Category:** Inspecting HVAC Systems\
**Created:** [April 26, 2008, 7:05pm UTC](https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619 "2008-04-26T19:05:52Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![kmalone](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kmalone/32/172217_2.png) [@kmalone](https://forum.nachi.org/u/kmalone)\
**Post date:** [April 26, 2008, 7:05pm UTC](https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619/1 "2008-04-26T19:05:52Z")

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Does anyone have a Date code chart for Armstrong Furnaces? I have one for the Armstrong A/C but not for the furnaces.  
Model: [FONT=‘Times New Roman’]GUJ125D20[/FONT]  
[FONT=Arial]Serial: [FONT=‘Times New Roman’] **8499F63244** [/FONT][/FONT]  
[FONT=‘Times New Roman’]\*\*\*\*[/FONT]  
[FONT=‘Times New Roman’]\*\* Thanks, Ken\*\*[/FONT]

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**Author:** ![jwilliams4](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jwilliams4](https://forum.nachi.org/u/jwilliams4)\
**Post date:** [April 26, 2008, 7:08pm UTC](https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619/2 "2008-04-26T19:08:50Z")

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[http://www.armstrongair.com/contact.php](http://www.armstrongair.com/contact.php)]([http://www.armstrongair.com/contact.php](http://www.armstrongair.com/contact.php))  
Newer units – (Serial Number) First two numbers equal manufacturing **plant #,** 2nd two are\*\* year\*\* and letter in fifth slot is **month** (A thru M minus I). So **5898 G 07568** would be Plant **# 58** , Year of MFR would be \*\*1998 \*\*and month would be **July**.

June 1999.

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**Author:** ![kmalone](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kmalone/32/172217_2.png) [@kmalone](https://forum.nachi.org/u/kmalone)\
**Post date:** [April 26, 2008, 7:14pm UTC](https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619/3 "2008-04-26T19:14:09Z")

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For some reason it did not upload my info.  
Does anyone have a date code chart for Armstrong furnaces?

\*\*Model Number: \*\*[FONT=Symbol]·[/FONT]GUJ125D20  
\*\*Serial Number: [FONT=Symbol]·[/FONT]\*\ ***8499F63244**

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**Thanks, Ken**

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**Author:** ![rray](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rray/32/2162_2.png) [@rray](https://forum.nachi.org/u/rray)\
**Post date:** [April 27, 2008, 9:22am UTC](https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619/4 "2008-04-27T09:22:56Z")

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Hey, Ken.

I’m posting this so you’ll get an email alert to make sure you saw Jae’s post.

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**Author:** ![kmalone](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kmalone/32/172217_2.png) [@kmalone](https://forum.nachi.org/u/kmalone)\
**Post date:** [April 27, 2008, 1:30pm UTC](https://forum.nachi.org/t/date-code-for-armstrong-furnace/27619/5 "2008-04-27T13:30:25Z")

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Thanks, for the info. For some reason I was unable to read the posts last night. But it is working this morning. You guy’s are the best! Ken