Pacific Energy Neo 2.5 insert

[tomalophicon]

Hi experts,

I'm experiencing an odd thing where the left side of the heater looks like it's having a draught issue. The wood stays dark and doesn't really take, and smoke circles around that area for a while (till things get really hot). Then when reloading I get the same issue; wood takes ages to catch on and smoke hangs around the left side of the heater and the glass gets dark very quickly. 

I've searched but found nothing.

Any thoughts?

Cheers all

Tom.