Mitsubishi · Mini-split
P8 Abnormal pipe temperature (often refrigerant leak)
What this code means
Mitsubishi's own service documentation defines P8 as an abnormal refrigerant pipe temperature reading — most often caused by a refrigerant leak, though a dirty coil or failing compressor can also trigger it.
Most likely causes
- Refrigerant leak in the line set or coil
- Dirty outdoor condenser coil restricting heat exchange
- Failing compressor or run capacitor
What to try first
Turn off power at the breaker and clear leaves, dirt, or debris from the outdoor unit's coil and fan area. If cleaning the coil doesn't resolve it, this likely points to a refrigerant leak, which needs an EPA-608-certified technician.
Safety first: stop using the appliance and shut off its gas or power until it has been inspected — this fault category is associated with fire or gas risk.
Find the part on Amazon →FAQ
What does Mitsubishi error code P8 mean?
Abnormal pipe temperature (often refrigerant leak). Mitsubishi's own service documentation defines P8 as an abnormal refrigerant pipe temperature reading — most often caused by a refrigerant leak, though a dirty coil or failing compressor can also trigger it.
Can I fix Mitsubishi code P8 myself?
No — stop using the appliance and shut off its gas or power until it has been inspected. This fault category is associated with fire or gas risk.
What causes Mitsubishi code P8?
The most common causes are: refrigerant leak in the line set or coil; dirty outdoor condenser coil restricting heat exchange; failing compressor or run capacitor.
Other Mitsubishi mini-split codes
All Mitsubishi mini-split error codes →
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This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.