On 2/25/2018 2:14 PM, house13 wrote:
We installed a wood burner about 6 months ago before installing it the
chimney
was swept and it worked well.

The brand and model is?

We are unable to use it now as it gives off a very toxic smell, we have
had it cleaned and the chimney swept again, but the smell is still there.

If it comes with a catalytic converter that likely is your issue.

Check the damper settings and burn a load of wood off until very hot.

Then readjust the damper/converter.