Owen1508
Minister of Fire
The first two things that I have found on this unit is one the damper valve (on the OAK inside the unit) may not be fully open. Also this unit does sometimes prefer (operates better with at least 3 feet vert. venting, so adding maybe another 2 foot on the outside may do the trick.
littlewop sounds right on it's a air flow issue
littlewop sounds right on it's a air flow issue