York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor E11 Error Fix: Compressor Start Relay Failure

Error code E11 on the York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor means: Compressor Start Relay Failure. The compressor start relay has failed or is stuck, preventing the compressor from starting. This causes the heat pump to stop heating or cooling entirely.

The most successful fix is "Replace compressor start relay" (medium difficulty, ~45 minutes). Estimated DIY cost: $40-$60. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace compressor start relay") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Soldering iron, Multimeter.

DIY cost: $40-$60. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor has 8 other known error codes, including: E1 (High Pressure Switch Trip), E10 (Indoor Coil Freeze Warning), E12 (Communication Error Between Indoor and Outdoor Units), E13 (Outdoor Ambient Temperature Sensor Failure), E14 (High Limit Thermostat Open), and 3 more.

Error code E11 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, YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll 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.