Mitsubishi Error Code P8: Pipe Temperature Abnormality
Refrigerant pipe temperature thermistor reading out of range (defective sensor or low refrigerant charge).
Equipment TypeMr Slim & City Multi Heat PumpBrand: Mitsubishi Electric
Fault SeverityCriticalSystem Lockout Active
Estimated Repair Cost$150 โ $480Parts & Certified Labor
๐จ Symptoms of Mitsubishi Electric Error P8
- Unit shuts down with P8 error on remote controller
- Blinking timer light
- Air blowing ambient temperature without heating/cooling
๐ Root Causes for Mitsubishi Electric Code P8
- Low refrigerant charge due to flare nut leak
- Faulty liquid pipe or gas pipe thermistor
- Clogged air filters restricting airflow across indoor coil
- Defective electronic expansion valve (EEV) stuck closed
๐ ๏ธ How to Reset & Troubleshoot Mitsubishi Electric Error P8
- Clean indoor unit dust filters to restore proper airflow
- Measure thermistor resistance (should read ~5k to 10k Ohms at 25ยฐC)
- Check system operating pressure with manifold gauges for refrigerant leaks
- Replace defective thermistor or electronic expansion valve coil
Frequently Asked Questions โ Mitsubishi Electric Code P8
What does Mitsubishi Electric error code P8 mean?
Mitsubishi Electric code P8 indicates: Refrigerant pipe temperature thermistor reading out of range (defective sensor or low refrigerant charge).
How do I reset error code P8 on Mitsubishi Electric?
Turn off the electrical circuit breaker or isolator to the unit for at least 5 minutes to discharge the capacitors and reset the microprocessor. If the code reappears immediately upon restarting, professional inspection is required.
What causes error code P8 on Mitsubishi Electric systems?
Common triggers include: Low refrigerant charge due to flare nut leak, Faulty liquid pipe or gas pipe thermistor, Clogged air filters restricting airflow across indoor coil.