What causes Midea Mini Split P1?

Power supply problems: supply voltage that is too high, too low or unstable, for example a weak circuit, a loose breaker connection or brownouts (Midea's first check). Loose, burnt or wrong connections in the power wiring, including the L and N supply terminals (Midea's second check: correct the connections or replace the wires). A faulty IPM board (inverter power module), which Midea replaces when the DC voltage between P and N is out of range. A faulty reactor or outdoor main control board, the last items on Midea's flowchart. Midea's Mission Inverter and older wall-mount manuals also list "system leakage or block" among the supposed causes.

How do I fix Midea Mini Split P1?

Write down the code and when it shows up (right at power-up, on startup, or after running a while). That helps a technician tell a supply problem from a board problem. Check the outdoor disconnect and the breaker for the mini split. A breaker that feels warm, buzzes or keeps tripping needs an electrician. Notice whether lights dim or other appliances act up when the mini split starts, or whether P1 appears during storms or brownouts. Those point to the power supply, which is Midea's first check. Turn the system off at the breaker, wait a few minutes, then restore power and restart. If P1 clears and doesn't come back, it may have been a one-time voltage dip. If P1 keeps returning, stop resetting it and call a licensed HVAC technician or electrician. Don't open the outdoor unit's electrical box: Midea warns that electricity remains in the capacitors even when the power is off.

When should I call a pro for Midea Mini Split P1?

Measure the supply voltage at the outdoor unit and confirm it is within the nameplate range. If the supply is the problem, Midea's chart says to turn the unit off until it is corrected. Check the power and interconnecting wiring, the L and N terminals and every connection on the outdoor board; correct the connections or replace damaged wires. With the capacitors safely discharged and the cover off, power on and measure DC voltage between P and N: about 310, 340 or 380 V DC in standby and 220 to 400 V DC once the compressor starts. If it is out of range, Midea's flowchart says to replace the IPM board. If the P to N voltage is normal, follow Midea's chart to the reactor and then the outdoor main PCB; on models with a sealed electric control box, newer Midea manuals skip the P to N step and handle the box as a unit. On newer units showing PC 01, PC 10, PC 11 or PC 12, use that model's service manual section, which follows the same supply, wiring, P to N and reactor checks.

Code: P1🔧 Midea Mini Split

Midea Mini Split Error Code P1: Over Voltage or Low Voltage Protection (Meaning, Causes, Fixes)

Q: What does Midea Mini Split P1 mean?

P1 on a Midea mini split means the outdoor unit's voltage protection has tripped: its voltage detection circuit saw the power rise too high or drop too low, so the system stopped to protect the inverter electronics. Midea's service manuals point first at the power supply and the wiring connections, then at the outdoor unit's IPM (inverter power module) board, reactor and main board. Checking the breaker, the supply and a clean restart are fair homeowner steps; anything inside the outdoor unit's electrical box is a job for a licensed HVAC technician or electrician. Midea's error tables list P1 as "Over voltage or too low voltage protection" (the Oasis Plus 3D manual's table words it "over voltage or over low voltage protection"). The Mission Inverter, Oasis Plus 3D, MTIU cassette/duct and older wall-mount service manuals all describe it the same way: an abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. In plain terms, the voltage feeding the inverter drive, either the incoming AC supply or the DC bus the outdoor board makes from it, went outside the range the control accepts. Midea's check for a technician is the DC voltage between the P and N terminals on the outdoor board: about 310, 340 or 380 V DC in standby (Midea's remark says the normal value is around 310 V) and between 220 and 400 V DC once the unit starts. On older Midea wall units that use indicator lamps instead of a display, P1 shows as the operation lamp flashing 2 times with the timer lamp flashing. Newer Midea manuals, such as the Light Commercial Inverter (R32) and PortaSplit service manuals, use the code PC 01 for the same over or low voltage protection (2 flashes on the light commercial table), and add related codes PC 10, PC 11 and PC 12 for low AC voltage and DC bus high voltage.

Reviewed 2026-10-24 · Based on 5 manufacturer & service sources

What the code means

Midea's error tables list P1 as "Over voltage or too low voltage protection" (the Oasis Plus 3D manual's table words it "over voltage or over low voltage protection"). The Mission Inverter, Oasis Plus 3D, MTIU cassette/duct and older wall-mount service manuals all describe it the same way: an abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. In plain terms, the voltage feeding the inverter drive, either the incoming AC supply or the DC bus the outdoor board makes from it, went outside the range the control accepts. Midea's check for a technician is the DC voltage between the P and N terminals on the outdoor board: about 310, 340 or 380 V DC in standby (Midea's remark says the normal value is around 310 V) and between 220 and 400 V DC once the unit starts. On older Midea wall units that use indicator lamps instead of a display, P1 shows as the operation lamp flashing 2 times with the timer lamp flashing. Newer Midea manuals, such as the Light Commercial Inverter (R32) and PortaSplit service manuals, use the code PC 01 for the same over or low voltage protection (2 flashes on the light commercial table), and add related codes PC 10, PC 11 and PC 12 for low AC voltage and DC bus high voltage.

Likely causes

Power supply problems: supply voltage that is too high, too low or unstable, for example a weak circuit, a loose breaker connection or brownouts (Midea's first check)
Loose, burnt or wrong connections in the power wiring, including the L and N supply terminals (Midea's second check: correct the connections or replace the wires)
A faulty IPM board (inverter power module), which Midea replaces when the DC voltage between P and N is out of range
A faulty reactor or outdoor main control board, the last items on Midea's flowchart
Midea's Mission Inverter and older wall-mount manuals also list "system leakage or block" among the supposed causes

Safe DIY checks

⚠ Before you start

Unplug the appliance or switch off its breaker before opening panels.

Write down the code and when it shows up (right at power-up, on startup, or after running a while). That helps a technician tell a supply problem from a board problem.
Check the outdoor disconnect and the breaker for the mini split. A breaker that feels warm, buzzes or keeps tripping needs an electrician.
Notice whether lights dim or other appliances act up when the mini split starts, or whether P1 appears during storms or brownouts. Those point to the power supply, which is Midea's first check.
Turn the system off at the breaker, wait a few minutes, then restore power and restart. If P1 clears and doesn't come back, it may have been a one-time voltage dip.
If P1 keeps returning, stop resetting it and call a licensed HVAC technician or electrician. Don't open the outdoor unit's electrical box: Midea warns that electricity remains in the capacitors even when the power is off.

🛠 When to call a pro

Measure the supply voltage at the outdoor unit and confirm it is within the nameplate range. If the supply is the problem, Midea's chart says to turn the unit off until it is corrected.
Check the power and interconnecting wiring, the L and N terminals and every connection on the outdoor board; correct the connections or replace damaged wires.
With the capacitors safely discharged and the cover off, power on and measure DC voltage between P and N: about 310, 340 or 380 V DC in standby and 220 to 400 V DC once the compressor starts. If it is out of range, Midea's flowchart says to replace the IPM board.
If the P to N voltage is normal, follow Midea's chart to the reactor and then the outdoor main PCB; on models with a sealed electric control box, newer Midea manuals skip the P to N step and handle the box as a unit.
On newer units showing PC 01, PC 10, PC 11 or PC 12, use that model's service manual section, which follows the same supply, wiring, P to N and reactor checks.

Parts that commonly fix it

Always match the part number to your exact model.

⚙

Outdoor control board or IPM board (exact part for your outdoor model)

Midea replaces the IPM board when the P to N DC voltage is wrong and the outdoor main board at the end of the chart; match the outdoor unit's model number.

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⚙

Digital multimeter (CAT III rated)

For the supply voltage and P to N DC bus checks, done by a qualified technician with the capacitors discharged.

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Sources

Last reviewed 2026-10-24. Always confirm against the manual for your exact model number.

Midea Mini Split Error Code P1: Over Voltage or Low Voltage Protection (Meaning, Causes, Fixes)

What the code means

Likely causes

Safe DIY checks

🛠 When to call a pro

Parts that commonly fix it

Outdoor control board or IPM board (exact part for your outdoor model)

Digital multimeter (CAT III rated)

Related codes

Sources