Westinghouse Air Conditioner Error E4

⚡ Quick Answer: The Westinghouse Air Conditioner E4 error code indicates a malfunction with the condenser coil temperature sensor. This failure can lead to incorrect ... ✅ DIY Fixable

What Does Error E4 Mean?

The Westinghouse Air Conditioner E4 error code indicates a malfunction with the condenser coil temperature sensor. This failure can lead to incorrect temperature readings and a loss of both cooling and heating functions. Common causes include an open circuit or short in the sensor, as well as wiring or connector issues. It's important to address this promptly to restore proper functioning.

Common Symptoms:

  • Unit displays ‘E4’ and stops cooling or heating
  • Occurs after running for some time
  • Possible loss of cooling function

Possible Causes

  • Condenser coil temperature sensor open circuit or short (medium)
  • Sensor wiring fault or connector issue at the condenser coil sensor (medium)

How to Fix Error E4

DIY Fix Basic checks before professional service

  1. Power off the air conditioner and disconnect mains power.
  2. Visually inspect the outdoor unit around the condenser for obvious damage or debris.
  3. Check for loose visible plugs or connectors near coil sensors if accessible without disassembly (do not force connections).
  4. Reconnect power and see if the error persists.

Technician Only Diagnose and repair condenser coil temperature sensor fault

  1. Isolate and test the condenser coil temperature sensor for open/short circuit using multimeter across terminals.
  2. Inspect sensor wiring harness and connectors for continuity, corrosion, or damage; repair or replace as necessary.
  3. If the sensor is faulty, replace the condenser coil temperature sensor with a manufacturer‑specified part.
  4. Test the air conditioner after repairs to verify the E4 code no longer appears and normal cooling/heating resumes.

Parts needed: Condenser coil temperature sensor, Wiring harness and connectors

🛑 When to Call a Pro:
  • If error E4 persists after basic inspection and power cycle
  • If you are not comfortable accessing or testing electrical components
  • If the air conditioner exhibits additional abnormal behavior (no cooling, loud noises, frequent shutdowns)

Next step

Choose the next step for E4

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

Temperature Sensor

Monitors the internal temperature to ensure correct operation and prevent overheating.

Typical part-only price
$15 - $35
DIY difficulty
Easy
Estimated time
15-30 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

$20 - $120 · Medium · 30-90 mins

Check fit & price
Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

wattage N/A
component Indoor Temperature Sensor
resistance 5-10 kOhms
part_number WAC-SENSOR-001
voltage_rating 120V AC

Common Questions

What does E4 error mean on Westinghouse Air Conditioner?

E4 indicates a fault with the condenser coil temperature sensor, leading to incorrect temperature readings.

Can I fix Westinghouse Air Conditioner E4 error myself?

Yes, you can perform basic checks like inspecting for damage and loose connections before seeking professional help.

How much does it cost to fix E4 error?

Repair costs range from $80 to $250, depending on the sensor and labor costs in your area.

When should I call a technician for E4?

Call a technician if the E4 error persists after basic checks or if you're uncomfortable testing electrical components.

Data last verified: 2026-07-22

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