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A complete Rheem furnace troubleshooting guide, error codes and what they mean, LED Flashes, replacing your air filter, and more!View and Download Rheem CLASSIC 90 PLUS manual online. CLASSIC 90 PLUS RGTC SERIES 95% A.F.U.E. DOWNFLOW/HORIZONTAL GAS FURNACES. CLASSIC 90 PLUS furnace A complete Rheem furnace guide to troubleshooting, error codes and what they mean, model numbers, replacing your air filter, and more!