White Westinghouse Air Conditioner Error F4

⚡ Quick Answer: The F4 error code on a White Westinghouse Air Conditioner indicates a failure in the indoor temperature sensor. This can result in erratic temperature... ✅ DIY Fixable

What Does Error F4 Mean?

The F4 error code on a White Westinghouse Air Conditioner indicates a failure in the indoor temperature sensor. This can result in erratic temperature control and inconsistent cooling performance. It may also signify that the outdoor condenser coil temperature sensor is out of range or faulty, leading to potential shutdown of the outdoor unit and loss of normal temperature regulation.

Common Symptoms:

  • Unit stops heating or cooling when F4 appears
  • Possible loss of normal temperature regulation
  • Outdoor unit may cease operation or shut down due to sensor reading out-of-range

Possible Causes

  • Outdoor condenser coil temperature sensor (thermistor) out of range or faulty (medium)
  • Wiring or connection damage related to outdoor temperature sensing circuit (medium)

How to Fix Error F4

DIY Fix Basic checks and power reset

  1. Turn off the air conditioner and disconnect from power.
  2. Wait a few minutes and reconnect power to see if F4 clears.
  3. Visually inspect wiring to outdoor unit for obvious damage (no internal access).

Technician Only Diagnose and repair sensor circuit

  1. Disconnect power at the outdoor unit.
  2. Check and test outdoor condenser coil temperature sensor thermistor for correct resistance values.
  3. Inspect wiring harness and connectors for continuity and signs of heat damage or corrosion.
  4. Replace faulty condenser sensor if readings are out of range.
  5. If sensor and wiring are good but error persists, inspect and test outdoor PCB sensor input circuit and replace PCB if necessary.

Parts needed: Condenser temperature sensor (thermistor), Wiring harness/connector, Outdoor unit PCB (if required)

🛑 When to Call a Pro:
  • If error persists after power reset and basic checks
  • If the outdoor sensor or PCB diagnosis and replacement is required due to lack of tools/expertise

Technical Specifications

wattage N/A
component Indoor Temperature Sensor
resistance 5-15 kOhms at room temperature
part_number WAC-TS-01
voltage_rating 24V AC

Common Questions

What does F4 error mean on White Westinghouse Air Conditioner?

F4 indicates a failure in the indoor temperature sensor, causing erratic temperature control.

Can I fix White Westinghouse Air Conditioner F4 error myself?

Yes, you can perform basic checks and power reset to attempt to clear the error.

How much does it cost to fix F4 error?

Repair costs range from $80 to $300+ depending on sensor diagnostics and parts needed.

When should I call a technician for F4?

Call a technician if the error persists after a power reset or if sensor diagnosis requires expertise.

Data last verified: 2026-04-23

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