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.
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.
Source: Toshiba Outdoor Unit Service Manual
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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.
Symptômes
- Compressor stops suddenly
- Outdoor unit very hot
- Fault code P04 displayed
Diagnostic
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).
How to reset fault code P04 on Toshiba?
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?
Typical in hot weather on RAV commercial units, or after insufficient condenser cleaning. The outdoor unit remains hot to the touch.
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.
Technical source data
The Toshiba P04 activates the high-pressure switch protection on the outdoor unit. Estia/R32 procedure: check the operation of the high-pressure switch, the condition of associated components, and the opening of service valves.
Sources: toshiba-estia-r32-service-manual.pdf (p. 146)
Questions fréquentes
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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