P10 • Toshiba • Supported Toshiba VRF cassettes; check the model
Toshiba P10 cassette: indoor condensate overflow protection
Proof status : Manufacturer reference listed — check model coverage
Source: Toshiba Service Manual SVM-21002 — MMU-UP_1YHP-E · Last verified 28 September 2026
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Founder of AskMarcel.app. Sheets are written from manufacturer documentation; the reference is shown when it has been verified.
In brief
On supported Toshiba cassettes, P10 indicates indoor condensate overflow protection. The float, pump, drain or indoor board may be involved; it does not directly identify the pump. Switch the unit off, record its exact reference and have the condensate circuit checked against its service manual.
The Toshiba MMU-UP_1YHP-E manual lists P10 as indoor overflow trouble and checks for float, pump, drain and indoor board.
Continue this diagnosis in Marcel
Toshiba code P10: Marcel picks this code up for Supported Toshiba VRF cassettes; check the model and guides you, with the manufacturer reference when one exists.
For regular use on site: Install the app
What does fault code P10 on Toshiba mean?
On Toshiba cassettes covered by the MMU-UP_1YHP-E service manual, P10 indicates indoor overflow trouble. The float switch or its circuit may be faulty; the code alone does not identify a failed pump.
A blocked drain, float or connector issue, drain pump fault or indoor board fault may be involved. Use the exact model manual.
Differences between product ranges
| Range | Meaning | Exclusion |
|---|---|---|
| Cassette Toshiba MMU-UP_1YHP-E | Indoor overflow protection | Do not apply this procedure to another range without its manual |
Symptoms
- Complete unit shutdown to prevent water damage
- Possible pump noise
- Flashing P10 code
Safety notice
Do not open the electrical enclosure or force the unit to run when overflow is possible.
Diagnosis
1. Prevent water damage
- Switch the unit off and look for visible leakage or an accessible blocked drain without dismantling it.
- Record the full cassette model reference and any other codes.
2. Qualified diagnosis
- With power isolated, an engineer checks the float, connector, pump and drain against the matching manual.
- Replace the pump or board only when that test identifies the failure.
Repair and return to service — Toshiba fault P10
A qualified engineer checks the drain, float, pump and board against the exact model troubleshooting tree.
When should you call an F-Gas engineer?
Call an engineer if the float is clean, the drain is clear, and the pump still does not start.
Field context
Fault code P10 most often occurs during cooling operation, especially on Cassette / Ducted units. Complete unit shutdown to prevent water damage.
Technical source data
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P10 — Toshiba
Supported Toshiba VRF cassettes; check the model
On Toshiba cassettes covered by the MMU-UP_1YHP-E service manual, P10 indicates indoor overflow trouble. The float switch or its circuit may be faulty; the code alone does not identify a failed pump.
Source : Toshiba Service Manual SVM-21002 — MMU-UP_1YHP-E
Frequently asked questions
Can I use the air conditioning with P10?
No, the unit locks out to prevent flooding the false ceiling.
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