P04 • Toshiba • RAV / Tertiaire
Fault Code P04 Toshiba: Compressor Fault — Diagnosis
Fault code P04 is a physical safety triggered by the high-pressure switch on the Toshiba outdoor unit. The pressure has exceeded the critical threshold. The same logic applies to wall-mounted air conditioning units or RAV heat pumps.
Proof status : Manufacturer reference needed for the exact range
Source: Toshiba Outdoor Unit Service Manual
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In brief
Fault code P04 on Toshiba RAV / Tertiaire means: Fault code P04 is a physical safety triggered by the high-pressure switch on the Toshiba outdoor unit. The pressure has exceeded the critical threshold. The same logic applies to wall-mounted air conditioning units or RAV heat pumps. Most common cause: Outdoor condenser fouled (dust/pollen), outdoor fan failure, refrigerant overcharge, or discharge valve closed. Common fault during heatwaves. First action: Check if the rear of the outdoor unit is blocked. Clean it with a water jet or brush.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).
According to the Toshiba Estia R32 service manual, the P04 fault activates the high-pressure switch protection on the outdoor unit.
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What does fault code P04 on Toshiba mean?
Fault code P04 is a physical safety triggered by the high-pressure switch on the Toshiba outdoor unit. The pressure has exceeded the critical threshold. The same logic applies to wall-mounted air conditioning units or RAV heat pumps.
Outdoor condenser fouled (dust/pollen), outdoor fan failure, refrigerant overcharge, or discharge valve closed. Common fault during heatwaves.
Symptoms
- Compressor stops suddenly
- Outdoor unit very hot
- Fault code P04 displayed
Diagnosis
1. Clean the heat exchanger
- Check if the rear of the outdoor unit is blocked. Clean it with a water jet or brush.
2. Check ventilation
- Ensure the outdoor fan is running at full speed.
- Check that there is no obstruction in front of the grille (wall too close).
Repair and return to service — Toshiba fault P04
Clean the outdoor unit. If the problem persists after cooling down, have the refrigerant charge checked (too much gas causes high pressure).
When should you call an F-Gas engineer?
Contact an F-Gas registered engineer if the fault returns after basic checks, involves refrigerant charging, or requires PCB or compressor replacement on Toshiba RAV / Tertiaire.
Affected models
- RAV / Tertiaire
- Estia R32
Field context
Typical in hot weather on RAV commercial units, or after insufficient condenser cleaning. The outdoor unit remains hot to the touch.
Frequently asked questions
Can a Toshiba air conditioner in P04 be restarted immediately?
A reset by cutting the power is possible, but without addressing the cause (dirty condenser, fan, charge), the P04 will return within minutes.
Does P04 affect Toshiba heat pumps?
Yes, on RAV systems and Toshiba heat pumps, P04 activates the same high-pressure protection. Clean the outdoor condenser before any charge check.
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