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

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: 2026-07-01

User Comments (0)

Share your experience or solution below.

Be the first to comment!