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# Help with Deciphering my Boiler Service Tag

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Member Posts: 90
edited January 2022
Hi All,

This question should be real easy for you guys. Every August/September I have the oil company come out and do the usual filter, nozzle, draft test and vacuum/clean the center section of the boiler (if it's sooted up) - whatever is included in my yearly oil contract. When the tech is done he always write his notes on the service card. I'm curious to what it all means. I was working this August when the tech came to the house and I don't feel like waiting till August of 2022 to find out.

Let me know what you guys come up with. Thanks in advance!

8-3-2021 and 8-14-2020 are the two dates I'm curious about.

Long Island, NY

• Member Posts: 6,505
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C & A might mean clean and adjust. O sm probably means 0 smoke reading, -1, -3 are your over fire and breech draft measurements respectively, the others are combustion numbers. Some of them might even be true. The numbers on the right side might be a number assigned to the techs.
Not the most professional. They should leave a printout from the combustion analyzer, for starters.

There was an error rendering this rich post.

• Member Posts: 90
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Thank you Steve. You confirmed pretty much what I thought. The 400 and 450 is probably the stack temperature and I guess the 10% and 8.5% is the CO amount?
Long Island, NY
• Member Posts: 9,735
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CO2 or oxygen. CO that high would be a very poorly burning appliance.
• Member Posts: 90
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mattmia2 said:

CO2 or oxygen. CO that high would be a very poorly burning appliance.

Unless it was in % of PPM?
Long Island, NY
• Member Posts: 15,613
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8/3/21 CA= Clean and adjust Check base ......maybe check base of chimney or clean out the fire box base ....guessing
Os would be 0 smoke 8 1/2 Co2, -1 and -3 are probably draft (should be -.01 and -.03) "R" with a circle I think is replace nozzle and filter

@FredoSP how about a few pictures the 8 1/2 if that is Co2 that is low should be over 10 minimum

8-14-21 CA=clean and adjust, NF=nozzle & filter, check base, brush boiler, 0 smoke, -1, -3 is draft (should be -.01 & -.03) 450 sta, 10% ck temp