Trianco Activair R32 S700, S1200 fault ER05
High pressure protection
Heat pumpWhat it means
High refrigerant pressure protection has tripped, indicating pressure has exceeded the safe operating threshold.
Likely causes
- Blocked condenser/coil
- Fan failure
- Refrigerant overcharge
- Restriction in refrigerant circuit
- High pressure switch fault
Where to start
- Check high pressure switch wiring
- Check fan operation
- Check refrigerant charge
The full answer, free
- How to put it right, step by step
- The manual page for this fault (page 11), right under the answer
Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.
From the Trianco manual for the Activair R32 S700, S1200. Check the model on the data plate before you order parts.