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York · YZF42B21S LX Series AC

York YZF42B21S LX Series AC ED Error Fix: High Discharge Temperature Protection

The discharge temperature of the compressor is too high, which may indicate overheat due to high load, low refrigerant, or electrical faults. The system shuts down to prevent damage.

critical2 fixes available

Quick Answer

Error ED on the York YZF42B21S LX Series AC means: High Discharge Temperature Protection. The top-ranked community fix is “Test Compressor and Replace if Necessary” (hard difficulty, ~120 min, DIY cost: $0-$100). 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

Refrigerant Issue → Compressor FailedPrimary

Heating Element Failure → Thermal Fuse Blown

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: $600-$900.

Other York Models with Error ED

DERA-F036N07 14 SEER

air_conditioner · 2 fixes

Other York YZF42B21S LX Series AC Error Codes

Indoor Temperature Sensor Failure

2 fixes

Outdoor Coil Temperature Sensor Fault

2 fixes

High Pressure Switch Trip

2 fixes

Low Pressure Switch Trip

2 fixes

Compressor Overcurrent Protection

2 fixes

Indoor Fan Motor Locked Rotor

2 fixes

Outdoor Fan Motor Locked Rotor

2 fixes

Indoor Coil Freeze Protection Activated

2 fixes

People Also Ask About York YZF42B21S LX Series AC Error ED

What does error code ED mean on a York YZF42B21S LX Series AC?

Error code ED on the York YZF42B21S LX Series AC means: High Discharge Temperature Protection. The discharge temperature of the compressor is too high, which may indicate overheat due to high load, low refrigerant, or electrical faults. The system shuts down to prevent damage.

How do I fix error code ED on my York YZF42B21S LX Series AC?

The most successful fix is "Test Compressor and Replace if Necessary" (hard difficulty, ~120 minutes). Estimated DIY cost: $0-$100. HomeMD has 2 community-ranked fixes for this error.

Is error code ED on a York YZF42B21S LX Series AC serious?

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

Can I fix York YZF42B21S LX Series AC error ED myself?

Yes — the top-ranked community fix ("Test Compressor and Replace if Necessary") is rated hard difficulty and takes about 120 minutes. Tools needed: Multimeter, HVAC gauges, Vacuum pump.

How much does it cost to repair York YZF42B21S LX Series AC error ED?

DIY cost: $0-$100. Professional repair typically costs $600-$900. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the York YZF42B21S LX Series AC have?

The York YZF42B21S LX Series AC has 8 other known error codes, including: E1 (Indoor Temperature Sensor Failure), E2 (Outdoor Coil Temperature Sensor Fault), E3 (High Pressure Switch Trip), E4 (Low Pressure Switch Trip), E5 (Compressor Overcurrent Protection), and 3 more.

Which other York models have the ED error?

Error code ED also appears on 1 other York model: DERA-F036N07 14 SEER. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the York YZF42B21S LX Series AC have?

The York YZF42B21S LX Series AC has 8 other known error codes:

E1 — Indoor Temperature Sensor Failure (2 fixes)
E2 — Outdoor Coil Temperature Sensor Fault (2 fixes)
E3 — High Pressure Switch Trip (2 fixes)
E4 — Low Pressure Switch Trip (2 fixes)
E5 — Compressor Overcurrent Protection (2 fixes)
E6 — Indoor Fan Motor Locked Rotor (2 fixes)
E7 — Outdoor Fan Motor Locked Rotor (2 fixes)
E8 — Indoor Coil Freeze Protection Activated (2 fixes)

Which other York models have the ED error?

Error code ED also appears on 1 other York model:

DERA-F036N07 14 SEER (air conditioner) · 2 fixes

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