🌡️Heat Pump

E13

York · YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor

York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor E13 Error Fix: Outdoor Ambient Temperature Sensor Failure

The outdoor ambient temperature sensor is not providing valid readings to the system, which can affect defrost cycles and overall system performance.

Medium severity2 fixes available

Quick Answer

Error E13 on the York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor means: Outdoor Ambient Temperature Sensor Failure. The top-ranked community fix is “Replace outdoor ambient temperature sensor” (medium difficulty, ~35 min, DIY cost: $30-$50). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · heat pump

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

Root Cause Analysis

Sensor MalfunctionPrimary

When to Call a Professional

While many heat pump repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $130-$190.

Other York Models with Error E13

DERA-P036N07 HP 16 SEER

heat_pump · 2 fixes

GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace

furnace · 2 fixes

TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace

furnace · 2 fixes

TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace

furnace · 2 fixes

YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor

air_conditioner · 2 fixes

YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant

heat_pump · 2 fixes

Other York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor Error Codes

High Pressure Switch Trip

2 fixes

E10

Indoor Coil Freeze Warning

2 fixes

E11

Compressor Start Relay Failure

2 fixes

E12

Communication Error Between Indoor and Outdoor Units

2 fixes

E14

High Limit Thermostat Open

2 fixes

E15

Freeze Protection Sensor Open

Drain Pump Failure

Auxiliary Heater Failure

2 fixes

People Also Ask About York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor Error E13

What does error code E13 mean on a York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor?

Error code E13 on the York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor means: Outdoor Ambient Temperature Sensor Failure. The outdoor ambient temperature sensor is not providing valid readings to the system, which can affect defrost cycles and overall system performance.

How do I fix error code E13 on my York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor?

The most successful fix is "Replace outdoor ambient temperature sensor" (medium difficulty, ~35 minutes). Estimated DIY cost: $30-$50. HomeMD has 2 community-ranked fixes for this error.

Is error code E13 on a York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor serious?

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

Can I fix York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor error E13 myself?

Yes — the top-ranked community fix ("Replace outdoor ambient temperature sensor") is rated medium difficulty and takes about 35 minutes. Tools needed: Phillips screwdriver, Multimeter.

How much does it cost to repair York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor error E13?

DIY cost: $30-$50. Professional repair typically costs $130-$190. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor have?

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), E11 (Compressor Start Relay Failure), E12 (Communication Error Between Indoor and Outdoor Units), E14 (High Limit Thermostat Open), and 3 more.

Which other York models have the E13 error?

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, 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.

What other error codes does the York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor have?

The York YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor has 8 other known error codes:

E1 — High Pressure Switch Trip (2 fixes)
E10 — Indoor Coil Freeze Warning (2 fixes)
E11 — Compressor Start Relay Failure (2 fixes)
E12 — Communication Error Between Indoor and Outdoor Units (2 fixes)
E14 — High Limit Thermostat Open (2 fixes)
E15 — Freeze Protection Sensor Open (2 fixes)
E16 — Drain Pump Failure (2 fixes)
E17 — Auxiliary Heater Failure (2 fixes)

Which other York models have the E13 error?

Error code E13 also appears on 6 other York models:

DERA-P036N07 HP 16 SEER (heat pump) · 2 fixes
GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace (furnace) · 2 fixes
TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace (furnace) · 2 fixes
TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace (furnace) · 2 fixes
YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor (air conditioner) · 2 fixes
YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant (heat pump) · 2 fixes

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