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Checked no heat complaint, found thermostat set to off. Set to heat, furnace started and ran, after 5 minutes the furnace locked out on limit switch open. Inspected heat exchanger, see what may be a restriction in the second pass, see pictures. Checked limit switch it appears to be in good condition. Cycled furnace I’m getting a 148 degree supply and a 78 degree dt. I recommend replacing the limit switch first and if limit continues to trip a new heat exchanger will be needed.