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

York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant E3 Error Fix: Low-Pressure Switch Trip

The low-pressure switch has tripped due to abnormally low refrigerant pressure, indicating possible refrigerant leak or blockage. Compressor operation is halted to avoid damage.

critical2 fixes available✨ Free fix available

Quick Answer

Error E3 on the York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant means: Low-Pressure Switch Trip. The top-ranked community fix is “Locate and Repair Refrigerant Leak, Recharge System” (hard difficulty, ~90 min, DIY cost: $0-$60). 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

Refrigerant IssuePrimary

Sensor Malfunction

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: $320-$480.

Other York Models with Error E3

DERA-F036N07 14 SEER

air_conditioner · 2 fixes

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

Other York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant Error Codes

Outdoor Ambient Sensor Fault

2 fixes

Indoor Coil Temperature Sensor Fault

2 fixes

E10

Communication Fault Between Indoor and Outdoor Units

2 fixes

E11

Indoor Coil Freeze Protection Sensor Fault

2 fixes

E12

Compressor Start Relay Fault

2 fixes

E13

Outdoor Coil Freeze Protection Sensor Fault

2 fixes

E14

Indoor Unit Communication Fault

2 fixes

E15

Outdoor Unit Communication Fault

2 fixes

People Also Ask About York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant Error E3

What does error code E3 mean on a York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant?

Error code E3 on the York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant means: Low-Pressure Switch Trip. The low-pressure switch has tripped due to abnormally low refrigerant pressure, indicating possible refrigerant leak or blockage. Compressor operation is halted to avoid damage.

How do I fix error code E3 on my York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant?

The most successful fix is "Locate and Repair Refrigerant Leak, Recharge System" (hard difficulty, ~90 minutes). Estimated DIY cost: $0-$60. HomeMD has 2 community-ranked fixes for this error.

Is error code E3 on a York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant 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 YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant error E3 myself?

Yes — the top-ranked community fix ("Locate and Repair Refrigerant Leak, Recharge System") is rated hard difficulty and takes about 90 minutes. Tools needed: Leak detector, Vacuum pump, Refrigerant gauge set.

How much does it cost to repair York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant error E3?

DIY cost: $0-$60. Professional repair typically costs $320-$480. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant have?

The York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant has 8 other known error codes, including: E0 (Outdoor Ambient Sensor Fault), E1 (Indoor Coil Temperature Sensor Fault), E10 (Communication Fault Between Indoor and Outdoor Units), E11 (Indoor Coil Freeze Protection Sensor Fault), E12 (Compressor Start Relay Fault), and 3 more.

Which other York models have the E3 error?

Error code E3 also appears on 3 other York models: DERA-F036N07 14 SEER, YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor, YZF42B21S LX Series AC. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant have?

The York YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant has 8 other known error codes:

E0 — Outdoor Ambient Sensor Fault (2 fixes)
E1 — Indoor Coil Temperature Sensor Fault (2 fixes)
E10 — Communication Fault Between Indoor and Outdoor Units (2 fixes)
E11 — Indoor Coil Freeze Protection Sensor Fault (2 fixes)
E12 — Compressor Start Relay Fault (2 fixes)
E13 — Outdoor Coil Freeze Protection Sensor Fault (2 fixes)
E14 — Indoor Unit Communication Fault (2 fixes)
E15 — Outdoor Unit Communication Fault (2 fixes)

Which other York models have the E3 error?

Error code E3 also appears on 3 other York models:

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

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