York GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace E13 Error Fix: Transformer Failure

Error code E13 on the York GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace means: Transformer Failure. The furnace transformer is not providing the required voltage to control circuits, causing system malfunction. This error is caused by transformer winding failure or electrical faults.

The most successful fix is "Replace Transformer" (hard difficulty, ~45 minutes). Estimated DIY cost: $70-$100. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Replace Transformer") is rated hard difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Multimeter.

DIY cost: $70-$100. Professional repair typically costs $200-$300. Many homeowners save money by trying the top-ranked community fix first.

The York GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes, including: E01 (Ignition Failure), E02 (Flame Sensor Fault), E03 (Pressure Switch Open), E04 (Limit Switch Open), E05 (Inducer Motor Failure), and 3 more.

Error code E13 also appears on 6 other York models: DERA-P036N07 HP 16 SEER, TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace, TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace, YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor, YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor, YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant. The fix may vary by model, so check each model's specific page for tailored repair steps.