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Found system was locking out on codee228 ( un able to perform pressure switch calibration). Found some debris in pressure tubing. Blew out tubing and condensation lines to clear out junk in the lines. Also suggested we do a tune up and to get the membership for discounts. Performed precision heat tune up on Lennox gas furnace. 16x25x4 air filter is 3 years old , homeowner to replace. Checked all electrical conections and components. Cleaned flame sensor. Performed combustion test, and checked temperature rise. Furnace is working fine at time of service