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Performed heating maintenance, replaced air filter. Cleaned burner and flame sensor, inspected heat exchanger. Checked voltage, amperage and electrical connections, measured capacitor values. Started gas furnace, tested limit and safety switches. Performed combustion test, tested high for com and vent temperature, also the limit is tripping. Found high temperature rise. Shut off furnace. Suspect a restricted heat exchanger. Recommend replacing system. Need a sales appointment scheduled.