The Lilyking 629 door catch can sometimes get out of alignment causing the door not to close correctly. If the door is not fully sealed then air from the room will continuously enter the stove making the stove overfire and run less efficiently. If your door catch is not 100% replace it, it will pay for itself within a couple of weeks due to the improved efficiency of the door correctly closed. Please also check out our Lilyking 629 door seals
from this link.