Daikin Air Conditioner Error P4-00

⚡ Quick Answer: The Daikin air conditioner error P4-00 signifies a compressor overload protection issue, primarily related to the outdoor unit's heat dissipation temp... ✅ DIY Fixable

What Does Error P4-00 Mean?

The Daikin air conditioner error P4-00 signifies a compressor overload protection issue, primarily related to the outdoor unit's heat dissipation temperature sensing component. This situation often results in the outdoor unit ceasing operation, with the P4 error displayed on the controller, and can lead to overheating and ineffective cooling. Common causes include a faulty fin temperature thermistor, loose thermistor connectors, or issues with the outdoor fan motor affecting cooling efficiency.

Common Symptoms:

  • Outdoor unit stops operation
  • Error P4 displayed on controller or unit
  • Possibly overheating/no cooling

Possible Causes

  • Faulty fin temperature thermistor (medium)
  • Loose or faulty thermistor connector (medium)
  • Outdoor fan motor or cooling inefficiency causing abnormal heat (medium)

How to Fix Error P4-00

DIY Fix Basic Reset and Visual Check

  1. Turn off the air conditioner using the remote or breaker.
  2. Wait about 1–2 minutes.
  3. Turn power back on and attempt restart.
  4. Visually inspect outdoor unit for obstructions (debris, dirt) that may impede airflow.

Technician Only Inspect and Replace Fault Components

  1. Measure fin thermistor resistance and compare to expected values.
  2. Check connectors for continuity and secure attachment.
  3. Inspect outdoor fan motor and heatsink/fin temperatures during operation.
  4. Replace faulty thermistor, connectors, or fan motor if diagnosed.
  5. Test unit under operation to confirm resolution.

Parts needed: Fin thermistor, Thermistor connector, Outdoor fan motor

🛑 When to Call a Pro:
  • If reset and visual checks do not clear the error
  • If outdoor unit components are clearly malfunctioning
  • If you cannot safely access the outdoor unit

Technical Specifications

wattage 1500W
component Compressor
resistance 5-10 ohms
part_number DAIKIN 4F001A0
voltage_rating 220V AC

Common Questions

What does P4-00 error mean on daikin air conditioner?

It indicates a compressor overload protection issue, affecting cooling and causing the outdoor unit to stop.

Can I fix daikin air conditioner P4-00 error myself?

Yes, you can perform a basic reset and visual check of the unit.

How much does it cost to fix P4-00 error?

Repair costs range from $80 to $300+, depending on parts and labor needed.

When should I call a technician for P4-00?

Call a technician if the reset doesn't work, components show clear malfunctions, or if you can't safely access the outdoor unit.

Data last verified: 2026-07-01

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