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Error Code P0 (PC00)Updated 5 months ago

Single-Zone Mini Split Systems
Multi-Zone and Light Commercial Mini Split Systems
YN009AMFI20RPD / WS009AMFI20HLDYN020GMFI22M2E
YN009GMFI20RPD / WS009GMFI20HLDYN030GMFI22M3E
YN012AMFI20RPD / WS012AMFI20HLDYN040GMFI22M4E
YN012GMFI20RPD / WS012GMFI20HLDYN050GMFI22M5E
YN018GMFI20RPD / WS018GMFI20HLDCB009GMFILCFHD / CB012GMFILCFHD / CB018GMFILCFHD / CB024GMFILCFHD
YN024GMFI20RPD / WS024GMFI20HLDRB009GMFILDFHD / RB012GMFILDFHD / 
RB018GMFILDFHD / RB024GMFILDFHD
YN030GMFI20RPD / WS030GMFI20HLDFB012GMFILDFHE / UB018GMFILCFHD / UB024GMFILCFHD
YN036GMFI20RPD / WS036GMFI20HLDWS009GMFI22HLE / WS012GMFI22HLE / WS018GMFI22HLE / WS024GMFI22HLE
YN009AMFI22RPE / WS009AMFI22HLE
YN012AMFI22RPE / WS012AMFI22HLE
YN009GMFI22RPE / YN012GMFI22RPE / YN018GMFI22RPE / YN024GMFI22RPE


The "P0" or "PC00" code on a QUANTUM series (WS/CB/RB/FB/UB) is an inverter drive error. It can either be the compressor failing or an outdoor board failure.

If this is a new unit, ensure that your outdoor refrigerant valves are backed out all the way counterclockwise to the open position.

Outdoor Unit's Valves


This can usually be confirmed with ohming Ω out the compressor with a multimeter, which requires the power completely off at your breaker or disconnect. Remove the top and front panels of the unit to see the compressor. You will have to pull out the sound insulation blanket that is wrapped around it.

You will then ohm Ω out 3 compressor lead pairs on the large white Molex plug between the compressor and the board. This plug usually has red, blue, and white (or black) wires. This means you will test each pin against each other.

Then, test each one individually against ground, you may use the metal casing of the unit or a ground screw. These should not have any reading against ground; the compressor should not be grounded. It should read 0 or Open Line. 

If the compressor checks out fine, the outdoor IPM board needs to be replaced.
You can contact our parts department at 800-919-0150 - option 4.

Please review attached, this is the manual for the WYS wall mount. Page 21/155 will show you the correct wiring for the compressor. 
Additionally, page 90/155 of this pdf will show how to open the outdoor condenser unit.


You may also use this youtube video to reference the troubleshooting for this error code(0:00 - 3:30): https://www.youtube.com/watch?v=BbWekj6Uoyk&t=4s&ab_channel=PioneerMiniSplitStore


Troubleshooting Diagram:


You may require an HVAC professional for assistance.
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