Purchased a house recently with an old Buck 27000. Wanting it to help supplement the cold winter, but I cannot get it up to temperature. Standalone unit with metal flue (~25ft in height to roof cap). Had two separate chimney guys come out and check the flue for blockage and inspect it. Both said it was fine. I set up the fire with fatwood, pine kindling, and kiln dried maple. Keep the door cracked, damper open. Lights up fine. Let it build, add more wood, etc. When I see ashy wood and glowing red coals, I put the damper on the second from the last slot and keep the draft doors fully or half open. No matter what I do, the oven never goes above 130C (as tested by laser thermometer right above the chimney spout). The blower fan and thermostat are brand new...blower occasionally kicks on. Frustrating because it can't heat up the house. Called Buck for help and they have no idea. Wood moisture is 16%. I'm at a complete loss. Any advice would be greatly appreciated!