Ruud furnace and AC age by serial number
Ruud heating and cooling serials carry the week and year of manufacture. On most current units you skip the first letter and read the next four digits, and this Ruud serial number lookup does that for you to give the Ruud manufacture date.
Where do I find the serial number?
The data plate on a Ruud furnace is inside, so remove the front door that covers the blower. A Ruud outdoor condenser has its label on the cabinet, most often on the panel by the electrical connections.
How to read a Ruud serial number
Ruud has used three serial styles on heating and cooling equipment. The current one is a single plant letter and nine digits, with the week in digits two and three and the year in four and five. Longer older serials hide the plant letter partway through, with the week and year after it. A third, older style starts directly with the month and year.
Plant letter, week, year, sequence
- Used
- Current style
- Format
- Plant letter, week, year, sequence
- Example
- W291013412
Example, read
Longer serial with a plant letter in the middle, then week and year
- Used
- Older style
- Format
- Longer serial with a plant letter in the middle, then week and year
- Example
- 7351 M2806 16735
Example, read
The plant letter is usually F, M, G, W or N. The four digits after it are the week, then the year.
Month, year at the start (water heater style on some older units)
- Used
- Older style
- Format
- Month, year at the start (water heater style on some older units)
- Example
- 0804B10488
Example, read
Where to find the serial number
The data plate on a Ruud furnace is inside, so remove the front door that covers the blower. A Ruud outdoor condenser has its label on the cabinet, most often on the panel by the electrical connections.
Brands with the same format
Rheem uses the same serial format as Ruud.
Questions
How old is my Ruud furnace?
On current units, read the two digits after the first letter as the week, then the next two as the year.
What does 7351 M2806 16735 mean on a Ruud?
M is the plant letter. The 28 after it is the week and the 06 is the year, so it reads as week 28 of 2006.
Why might my Ruud serial start with four digits?
Some older Ruud units start with the month and year, as in 0804B10488, which reads as August 2004. The decoder checks that style too.
Is a Ruud serial read like a Rheem one?
Yes, for heating and cooling equipment. Ruud uses the same serial format as Rheem, so the same three styles apply.
Why does the decoder show a caution for my Ruud?
The two older Ruud styles are documented by fewer sources. We still read them, but suggest you check against a printed date if you can find one.
Can I look up a Ruud model number here?
Not here. A Ruud furnace or AC model number tells a technician what the unit is and how big it is. Its age comes from the serial alone.