YELLOW TAG MEANING - Service Mark Solutions


Yellow Tag – Confined Spaces

(As presented by ServiceMark Heating, Cooling & Plumbing)

Your equipment was just ‘yellow-tagged’ by an HVAC technician – why was this done and what does it mean?

  • The definition of a Yellow Tag (Confined Spaces) is when a field employee encounters of observes something that is not an immediate hazard (but does have the potential to become one in the future) but permanent repairs could be delayed, or when the space that provides combustion air could be insufficient to provide the needed combustion air for an appliance.
  • The fuel line or piece of equipment that is causing the condition may be turned on or left operating.
  • The field employee is responsible for filling out the Yellow Caution or Yellow Caution Insufficient Combustion Air tag in its entirety.
  • A field employee will explain to you the reasoning behind your system being tagged, they will also explain to you what needs to be done so your system can be up to code.
  • You will be asked to sign the yellow tag, stating that you understand why your system has been tagged, as well as what you need do to get it back up to code.
  • If a possible confined space problem is present, the field employee will ask you a list of questions in regards to the possibility of the presence of carbon monoxide. If you answer yes to any of these questions (without an alternate reason), then the employee must follow a list of actions.
    If your answer is no to these questions, the service or appliance should be yellow tagged and the Yellow Tag Insufficient Air for Combustion letter shall be left with you (if available.)

    “But another HVAC company was here and did not yellow-tag my equipment.”

    At ServiceMark Heating, Cooling & Plumbing, we are concerned with safety and are always doing our best to raise the bar regarding safety for both you, our valued customer, and our employees. By “Yellow Tagging” your equipment, our field technician has figured out that needed measures must be applied to ensure your safety. A Yellow Tag means that the issue can be corrected once the needed measures have been implemented.

    A note about Carbon Monoxide:

    Carbon monoxide is an odorless, colorless, tasteless and poisonous gas that burns with a pale-blue to yellow flame, produced when carbon burns with a lack of air. Any fuel – propane, natural gas, kerosene, oil, wood, coal or charcoal – can produce Carbon Monoxide when there is insufficient air for the combustion process.

    Assessing the Potential Presence of Carbon Monoxide (CO)

    1. Do you have a Carbon Monoxide Detector that has been alarmed?
    2. Any members of the household ill with the following symptoms: fatigue, headache, nausea, shortness of breath, dizziness? Do these symptoms seem to improve when they get out of the house?
    3. Have you noticed condensation/moisture on on your walls and windows, other than above your kitchen sink, or in bathrooms?
    4. Is there any water rusting, streaking, debris or soot on chimney, vents, or equipment?
    5. Have you smelled any unfamiliar burning odors from your fuel burning equipment?
    6. Are your houseplants dying?
    7. Do you have any pets that have become sluggish or ill?

    If you answered yes to some of the above, it could indicate the potential presence of CO. You should call an expert right away to assess the situation and to ensure that you and your family are safe in your home.