❄️Air Conditioner

York · DERA-F036N07 14 SEER

York DERA-F036N07 14 SEER E9 Error Fix: Indoor Unit Coil Temperature Sensor Error

The temperature sensor on the indoor coil is malfunctioning or disconnected, causing incorrect temperature readings. This leads to improper system control and possible shutdown.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error E9 on the York DERA-F036N07 14 SEER means: Indoor Unit Coil Temperature Sensor Error. The top-ranked community fix is “Replace indoor coil temperature sensor” (medium difficulty, ~45 min, DIY cost: $20-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · air conditioner

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

Sensor Malfunction → Temperature Sensor Drift

When to Call a Professional

While many air conditioner 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: $120-$180.

Other York Models with Error E9

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

heat_pump · 2 fixes

YZF42B21S LX Series AC

air_conditioner · 2 fixes

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

heat_pump · 2 fixes

Other York DERA-F036N07 14 SEER Error Codes

High Pressure Switch Trip

2 fixes

Low Pressure Switch Trip

2 fixes

Compressor Overload

2 fixes

Indoor Fan Motor Locked

2 fixes

Outdoor Fan Motor Failure

2 fixes

Evaporator Coil Freeze

2 fixes

Thermistor Open Circuit

2 fixes

Communication Error Between Indoor and Outdoor Units

2 fixes

People Also Ask About York DERA-F036N07 14 SEER Error E9

What does error code E9 mean on a York DERA-F036N07 14 SEER?

Error code E9 on the York DERA-F036N07 14 SEER means: Indoor Unit Coil Temperature Sensor Error. The temperature sensor on the indoor coil is malfunctioning or disconnected, causing incorrect temperature readings. This leads to improper system control and possible shutdown.

How do I fix error code E9 on my York DERA-F036N07 14 SEER?

The most successful fix is "Replace indoor coil temperature sensor" (medium difficulty, ~45 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code E9 on a York DERA-F036N07 14 SEER 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 DERA-F036N07 14 SEER error E9 myself?

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

How much does it cost to repair York DERA-F036N07 14 SEER error E9?

DIY cost: $20-$30. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the York DERA-F036N07 14 SEER have?

The York DERA-F036N07 14 SEER has 8 other known error codes, including: E1 (High Pressure Switch Trip), E2 (Low Pressure Switch Trip), E3 (Compressor Overload), E4 (Indoor Fan Motor Locked), E5 (Outdoor Fan Motor Failure), and 3 more.

Which other York models have the E9 error?

Error code E9 also appears on 3 other York models: YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor, YZF42B21S LX Series AC, 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 DERA-F036N07 14 SEER have?

The York DERA-F036N07 14 SEER has 8 other known error codes:

E1 — High Pressure Switch Trip (2 fixes)
E2 — Low Pressure Switch Trip (2 fixes)
E3 — Compressor Overload (2 fixes)
E4 — Indoor Fan Motor Locked (2 fixes)
E5 — Outdoor Fan Motor Failure (2 fixes)
E6 — Evaporator Coil Freeze (2 fixes)
E7 — Thermistor Open Circuit (2 fixes)
E8 — Communication Error Between Indoor and Outdoor Units (2 fixes)

Which other York models have the E9 error?

Error code E9 also appears on 3 other York models:

YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor (heat pump) · 2 fixes
YZF42B21S LX Series AC (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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