Carrier error code P0
What it means
High voltage protection.
Possible causes
Supply voltage above acceptable operating range Wiring errors leading to overvoltage at unit Surge events affecting electronics
Suggested fix
Measure supply voltage under load, correct wiring or site power configuration and install surge protection where appropriate; inspect and replace damaged inverter or protective components before restarting.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other Carrier codes
- E1 — High pressure protection in the refrigeration circuit.
- E2 — Evaporator coil temperature sensor fault.
- E3 — Low pressure protection.
- E4 — Compressor discharge temperature protection.
- E5 — Overcurrent or overload protection.
- E6 — Communication error between indoor and outdoor units.
- EC — Refrigerant leak detection alarm.
- F0 — Low refrigerant protection.
- P1 — Low voltage protection.
- P4 — Fan speed fault.