Why Is Smoke Coming Into the Room From My Wood Burner or Fireplace?
For smoke spilling into the room from a wood-burning stove, multifuel stove or open fireplace during lighting, refuelling or normal burning.
What this usually means
Smoke entering the room is not normal. It can be caused by a blocked or poorly drawing flue, inadequate ventilation, adverse wind/downdraught, a cold chimney or incorrect operation. HETAS advises contacting a registered installer or chimney sweep if smoke spills into the room. Stop using the appliance until the cause is found, ventilate the room, and treat any carbon-monoxide alarm or symptoms as an emergency.
What may be causing this
The chimney or flue is restricted
Clues: Smoke spillage is persistent, draw is weak or sweeping is overdue.
What to do: Stop use and have the flue swept and inspected.
The room does not have enough combustion air
Clues: Spillage worsens with extractor fans running or in a tightly sealed room.
What to do: Have appliance ventilation and room pressure assessed.
Wind or chimney geometry is causing downdraught
Clues: The problem is strongly weather-related or occurs with certain wind directions.
What to do: Have the chimney termination, height and surrounding pressure zones assessed.
How to check what is happening
Do not relight until the cause is understood.
Negative room pressure may be contributing.
A sweep and inspection should be arranged before reuse.
Can you fix this yourself?
Homeowner action is to stop use, ventilate and record the circumstances. Flue testing, smoke-draw testing and chimney work should be done by competent professionals.
- Carbon monoxide alarm
- Phone/camera for observations
What you can safely try
- 1
Stop using the appliance
Let the fire die down safely and do not refuel.
- 2
Ventilate the room
Open external doors/windows if safe and move people away from smoke.
- 3
Record when spillage happens
Wind direction, extractor use and refuelling timing can help diagnosis.
- 4
Book a chimney/stove inspection
Have the flue, ventilation and installation checked before reuse.
Call a hetas-approved chimney sweep / stove technician if…
- A carbon monoxide alarm activates.
- Anyone has headache, dizziness, nausea, confusion or other possible CO symptoms.
- Smoke continues entering the room or there is a suspected chimney fire.
Get the right hetas-approved chimney sweep / stove technician.
We already know this problem maps primarily to a hetas-approved chimney sweep / stove technician. Choose the closest type of work, add your postcode and continue in the form.
Sources used for this guide
We prefer primary UK guidance, regulators and manufacturers for technical and safety-sensitive claims.
- Refuel your appliance safelyHETAS
- Wood-burning and multi-fuel chimney guidanceHETAS / BFCMA
Last reviewed: 5 September 2026. Home Manual updates review dates only when the substance of a guide is checked or changed.