York YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor E18 Error Fix: Indoor Unit Fan Overcurrent

Error code E18 on the York YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor means: Indoor Unit Fan Overcurrent. The indoor fan motor is drawing excessive current, possibly due to a mechanical jam or electrical fault, causing the protection to trigger and stop fan operation.

The most successful fix is "Replace Indoor Fan Motor" (hard difficulty, ~60 minutes). This fix costs nothing. 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 Indoor Fan Motor") is rated hard difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, Multimeter.

DIY cost: $0. Professional repair typically costs $140-$220. Many homeowners save money by trying the top-ranked community fix first.

The York YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor has 8 other known error codes, including: E01 (Indoor Temperature Sensor Fault), E02 (Outdoor Unit Fan Motor Failure), E03 (Refrigerant Leak Detected), E04 (Compressor Overcurrent Protection Triggered), E05 (Indoor Fan Motor Stall Detected), and 3 more.

Error code E18 also appears on 6 other York models: DERA-P036N07 HP 16 SEER, GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace, TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace, TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace, 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.