Westinghouse Air Conditioner Error P4

⚡ Quick Answer: The Westinghouse Air Conditioner P4 error indicates that the compressor has triggered its overload protection due to overheating. Symptoms typically i... ✅ DIY Fixable

What Does Error P4 Mean?

The Westinghouse Air Conditioner P4 error indicates that the compressor has triggered its overload protection due to overheating. Symptoms typically include a flashing display and continuous beeping, signaling that the unit may shut down or stop cooling. Common causes include high discharge temperature or issues with the compressor or inverter drive.

Common Symptoms:

  • Unit displays P4 and may shut down or stop cooling (community consensus for generic AC systems)

Possible Causes

  • Compressor discharge temperature protection trip (generic HVAC interpretation) (medium)
  • Inverter/compressor drive or sensor fault (generic HVAC interpretation) (medium)

How to Fix Error P4

DIY Fix Basic Checks and Reset

  1. Turn off unit and disconnect power for several minutes.
  2. Inspect that air filters and condenser coils are clean and unobstructed.
  3. Restore power and see if error persists.

Technician Only Professional Diagnosis of Compressor/Inverter System

  1. Check compressor discharge temperatures and pressures.
  2. Inspect temperature sensors and associated wiring.
  3. Test inverter board and compressor drive circuits with appropriate tools.

Parts needed: Temperature sensors, Inverter board, Possible compressor components

🛑 When to Call a Pro:
  • If error persists after basic resetting and cleaning
  • If you cannot safely access or test internal components

Technical Specifications

wattage 1500W
component Compressor
resistance 5-10 ohms
part_number WAC-COMP-12345
voltage_rating 115V AC

Common Questions

What does P4 error mean on Westinghouse Air Conditioner?

P4 error indicates compressor overload protection due to overheating, often causing beeping and cooling failure.

Can I fix Westinghouse Air Conditioner P4 error myself?

Yes, you can try basic checks like resetting the unit and cleaning filters and coils.

How much does it cost to fix P4 error?

Repair costs for the P4 error range from $150 to $800+, depending on the fault and required parts.

When should I call a technician for P4?

Call a technician if the error persists after resets and cleaning, or if you can't safely access internal components.

Sources & References

Data last verified: 2026-07-01

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