Westinghouse Air Conditioner Error E3

⚡ Quick Answer: The Westinghouse Air Conditioner E3 error indicates an issue with the outdoor ambient temperature sensor, causing erratic cooling and inconsistent tem... ✅ DIY Fixable

What Does Error E3 Mean?

The Westinghouse Air Conditioner E3 error indicates an issue with the outdoor ambient temperature sensor, causing erratic cooling and inconsistent temperature readings. This fault may result from a failed thermistor, corroded connectors, or a defective control PCB input. When the error occurs, the unit may intermittently stop cooling, particularly in high outdoor temperatures, and may trigger a shutdown of the outdoor unit.

Common Symptoms:

  • Unit displays E3 on the display panel
  • Cooling stops intermittently, especially during high outdoor temperatures
  • Outdoor unit sensor malfunction may trigger shutdown

Possible Causes

  • Failed outdoor ambient temperature thermistor (medium)
  • Corroded or damaged sensor connector or wiring (medium)
  • Defective outdoor control PCB input for ambient sensor (medium)

How to Fix Error E3

DIY Fix Basic checks and reset

  1. Turn off the air conditioner using the power switch.
  2. Disconnect power at the breaker or unplug for a few minutes to reset the system.
  3. Check that outdoor unit intake area is clear of debris and blockages.

Technician Only Inspect and replace outdoor ambient temperature sensor

  1. Turn off power at the outdoor disconnect or main breaker.
  2. Remove outdoor unit service panel to access control compartment.
  3. Locate the outdoor ambient thermistor near intake grille or on condenser frame.
  4. Visually inspect for damage/corrosion and test sensor resistance with a multimeter.
  5. Replace sensor if out of specification and reassemble properly.

Parts needed: Outdoor ambient thermistor sensor, Electrical connectors and harness as needed

🛑 When to Call a Pro:
  • Error persists after power reset and basic checks
  • Outdoor unit exhibits unusual noises or physical damage
  • Sensor replacement does not clear the error

Next step

Choose the next step for E3

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

Thermistor

Measures precise temperature changes and sends resistance feedback to the control board.

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

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Technical Specifications

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

Common Questions

What does E3 error mean on Westinghouse Air Conditioner?

E3 error indicates a failure in the outdoor ambient temperature sensor, leading to erratic cooling.

Can I fix Westinghouse Air Conditioner E3 error myself?

Yes, you can perform basic checks and reset the unit by turning it off and clearing debris.

How much does it cost to fix E3 error?

Repair costs range from $50 to $150 for the sensor part, plus labor.

When should I call a technician for E3?

Call a technician if the error persists after a reset, or if you notice unusual noises or damage.

Data last verified: 2026-07-22

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