Symptoms
- Flame doesn't shrink much between high and low settings
- Simmering food boils instead
- Flame may extend up around the sides of small pots
- Other burners behave normally
Likely causes
- CommonAir shutter or valve out of adjustmentSome ranges have an adjustable low-flame setting that can drift or be bumped.
- PossibleIncorrect burner cap installedA cap meant for a larger burner position can produce a bigger flame than expected.
- Less commonValve stuck partially openA worn valve may not close down fully even at the low setting.
What to do
- Confirm you're using the correct-sized burner cap for that position by comparing it to the range's diagram or manual.
- Try turning the knob slowly through its range and watch whether the flame shrinks gradually or jumps suddenly to low.
- If it jumps rather than tapering, note this since it points to a valve issue rather than something you can safely adjust.
- Check your manual for a manufacturer-approved low-flame adjustment screw, which some models have on the valve, but only touch it if the manual explicitly shows how.
- Do not attempt to disassemble or force the gas valve itself.
- If the flame stays high on low across multiple burners, or you're unsure about any adjustment screw, call a technician.
When to call a pro
Flame height that won't adjust down usually needs a technician to inspect or adjust the burner valve safely.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.