My Cumberland is giving a low vacuum error and wont light. I leaf blowed (sucked) the chimney and hit it with the lint eater then leafed it again. Still no luck. I need to find out what size rope gasket it takes. It would have to crap out on the coldest weekend so far. I fired up the Harman Accentra but man I hate the POS. I started it this morning and by 3 pm it was already pushing the flame guide of its perch. Missing the Cumberland. Im going to pull the draft blower out and clean the fins and see if that will help pull some vacuum. BTW I did clean out the vacuum port intake also. Did the whole stove as a matter of fact. Ill clean the fins if no luck then Ill replace the rope seals and lastly get a new vacuum switch if it comes to that.