Arrived onsite for heating issue on Cole Kent high efficiency gas fired furnace. Performed diagnostic and found the flame severely rolling out on startup. The flame would correct itself on the second or third try. Performed inspection of combustion component and drains. Clear combustion drain. Confirmed that combustion condensate water was not the issue. Inspected the flue pipe for blockages. Did not find a blockage but found the concentric flue pipe under the deck which could cause acidic moist air to be sucked into the furnaces fresh air pipe this would greatly reduce the life of the furnace, Cleaned and inspected the burners and gas orifaces, inspected combustion pressure sensors. Did not see a problem.
