P0
Carrier
Inverter Module / IPM Protection
Indoor unit shows P0 and system will not start or stops shortly after starting
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Overcurrent in inverter module, Shorted IPM, Poor heat sinking or blocked airflow around PCB, Incorrect supply voltage
How to Fix / Troubleshooting
Safety: High-voltage DC is present on inverter boards. Only qualified personnel should perform live testing. Always turn OFF power at the disconnect and breaker before opening panels.
- Step 1 – Check supply voltage: Have a qualified person verify that line voltage matches the Carrier unit nameplate and is stable.
- Step 2 – Inspect PCB cooling: Ensure the outdoor control box is clean and that any cooling fan or heat sink is not blocked by dirt or debris.
- Step 3 – Power reset: Turn OFF power for 10 minutes, then restore and test. If P0 returns, shut down the system.
- Step 4 – Technician repair: A Carrier technician should test the inverter module, compressor windings, and replace the outdoor PCB/IPM if necessary.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Power Module (IPM) Board
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