Burner flames on the gas range are yellow-orange rather than blue. The report should:

Flame colour is a direct readout of how completely gas is burning. A correctly adjusted natural gas burner mixes enough primary air to burn cleanly and produces a crisp blue flame. Yellow or orange indicates insufficient primary air, so combustion is incomplete — and incomplete combustion produces carbon monoxide along with soot. The common causes are ordinary and fixable: blocked or misaligned burner ports, a clogged air shutter, or debris in the burner assembly. Because the observation is a combustion-safety indicator rather than a cosmetic one, the report notes the condition and recommends service by a qualified appliance technician. The distinction the question is drawing is between reporting an indicator with a proportionate recommendation and either dismissing it or escalating to replacement.

Yellow-orange flames indicate insufficient primary air and therefore incomplete combustion, which produces carbon monoxide and soot. Reporting the observation and recommending appliance service is the proportionate response to a combustion indicator with common, correctable causes.

Complete combustion of natural gas yields a blue flame; a yellow or orange flame indicates insufficient primary air and incomplete combustion, with carbon monoxide and soot as products. Causes include blocked ports, debris and misadjusted air shutters.

Blue Is Clean, Yellow Is Not. The colour is the combustion report — orange means the burner is not getting enough air.

Distinguish a gas range from a gas furnace or water heater. Ranges are unvented by design, so incomplete combustion there raises the indoor air question directly.

• •Dismissing flame colour as a cosmetic variation
• •Escalating a serviceable condition to appliance replacement
• •Attributing appliance behaviour to the gas supply