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

Next step

Choose the next step for P4-00

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

Thermistor

Measures precise temperature changes and sends resistance feedback to the control board.

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 parts options

Check related components first; use model search as a fallback.

Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

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: 2026-07-25

User Comments (0)

Share your experience or solution below.

Be the first to comment!