York YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor E13 Error Fix: Thermistor Open Circuit

Error code E13 on the York YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor means: Thermistor Open Circuit. The thermistor sensor circuit is open or disconnected, causing the system to lose temperature sensing capability. This leads to improper temperature regulation and error code display.

The most successful fix is "Replace Thermistor Sensor" (hard difficulty, ~40 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Replace Thermistor Sensor") is rated hard difficulty and takes about 40 minutes. Tools needed: Phillips screwdriver, Multimeter.

DIY cost: $0. Professional repair typically costs $110-$170. 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 E13 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.