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York · YZF42B21S LX Series AC

York YZF42B21S LX Series AC EA Error Fix: Communication Error Between Indoor and Outdoor Units

Communication failure detected between indoor and outdoor control boards. This may be caused by wiring issues, faulty boards, or interference, leading to system malfunction or shutdown.

High severity2 fixes available

Quick Answer

Error EA on the York YZF42B21S LX Series AC means: Communication Error Between Indoor and Outdoor Units. The top-ranked community fix is “Replace Control Board” (hard difficulty, ~70 min, DIY cost: $150-$220). 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

Control Board FailurePrimary

Electrical Fault → Wiring Harness Damaged

When to Call a Professional

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

This is a high severity error — continued use may cause damage or a safety hazard
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: $400-$600.

Other York Models with Error EA

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 EA

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

Error code EA on the York YZF42B21S LX Series AC means: Communication Error Between Indoor and Outdoor Units. Communication failure detected between indoor and outdoor control boards. This may be caused by wiring issues, faulty boards, or interference, leading to system malfunction or shutdown.

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

The most successful fix is "Replace Control Board" (hard difficulty, ~70 minutes). Estimated DIY cost: $150-$220. HomeMD has 2 community-ranked fixes for this error.

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

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

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

Yes — the top-ranked community fix ("Replace Control Board") is rated hard difficulty and takes about 70 minutes. Tools needed: Phillips screwdriver, Multimeter.

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

DIY cost: $150-$220. Professional repair typically costs $400-$600. 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 EA error?

Error code EA 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 EA error?

Error code EA also appears on 1 other York model:

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

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