Over-Voltage or Under-Voltage Protection

Home Appliance Error Codes Midea Split AC

Can you still use it? No, unplug it

Who can fix it? Needs a technician

Typical repair time 30 minutes – 3 hours

Typical cost SAR 100 to 2,500

What it means

This code appears on Midea inverter split air conditioners with the classic code set when the supply voltage, or the DC voltage inside the outdoor board, goes above or below the allowed range, and the compressor stops until voltage returns to normal. Some Midea series use this code differently, so check the unit manual. The same code can mean something else on other brands.

Models covered: Midea residential split air conditioners with the classic display codes (E0–EC, F1–F4, P0–P4); newer Midea series use different codes (EH, EL, PC) and some models differ.

Symptoms4

The unit stops at peak times or when other large appliances start.
It restarts on its own once the power settles.
House lights flicker when the code appears.
It repeats more on generators or in buildings with old wiring.

Possible causes5

Low grid voltage at summer peak or high voltage at night.
Thin or long supply cable, or loose connections, causing voltage drop when the compressor starts.
Running on an unstable generator.
Partly burnt breaker or terminals.
Faulty voltage-sensing circuit or smoothing capacitors on the outdoor board.

How to diagnose5

Note whether the code shows at certain times or with other appliances running.
Check the breaker and confirm the AC is on a suitable dedicated circuit.
The technician measures voltage at the outdoor unit terminals while the compressor runs.
The technician checks connections and terminals for looseness or burning.
If the voltage is fine, the technician checks the sensing circuit on the outdoor board per the service manual.

How to fix5

Run the unit on a dedicated circuit with a suitable breaker.
Tighten terminals or replace a burnt breaker or terminals.
Fit a voltage protector (stabiliser) rated for the unit.
Upgrade the supply cable if it is undersized.
Replace the outdoor board if its sensing circuit is proven faulty, then confirm the code is gone.

Repair cost

0–200

200–600

600–1,500

1,500+

In Saudi riyals; the highlighted part is the expected range for this fault.

Most cases are solved with a voltage protector or terminal repair; the cost only reaches the top if the outdoor board has failed.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions

Will a voltage protector fix P1?

It usually reduces repeats, but a thin cable or loose terminal must be fixed first if that is the cause.

Does P1 harm the AC?

The code itself is protection, but unstable voltage stresses the outdoor board over time, so the cause is worth fixing.

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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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