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

Next step

Choose the next step for F4

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 components that may be involved

Check these only if your diagnosis points to them.

Possible related component

HVAC Control Board

Controls fan, compressor, sensor, and communication functions in the HVAC unit.

$90 - $320 · Hard · 45-120 mins

Check fit & price

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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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