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Found furnace locked out on (4 flash) open high limit error. [Hard lockout] 20x25x1 Filter was very dirty. Checked error code history and all limits including the 2 blower limits. Replaced filter with a 16x25x1 filter which covers the cutout of furnace. I didn’t have a 20x25x1 on the truck. Homeowner agreed to plan membership and diagnostic today. Completed heat tune up under new plan. Inspected burners. Made recommendation for upgrade. Cleaned flame sensor with 0000 steel wool. Verified flame rectification circuit. Measure temperature rise and static pressure: Good Checked gas pressure. Manifold pressure slightly low, adjusted accordingly. Inspected drain and safties. There is a float style pan switch and a evaporator pan secondary switch. Condensate pump safety is not wired in. Left estimate. Inspected wiring, components, electric motors and components. There are no surge protection devices. Left email estimates. Combustion, smoke and draft tests: Pass System is operating well