CodeRegistry
Brands
  1. Home
  2. Mitsubishi Electric
  3. Air Conditioning
  4. F7
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

F7

F7 - 1 red flash, 3 green flashes — Phase detection circuit fault

Mitsubishi Electric · Air Conditioning

What does F7 mean?

This indicates a fault within the phase detection circuit, often related to the outdoor unit's control board.

Common Causes

  • Faulty outdoor unit board
  • Wiring issue in the phase detection circuit
  • Power supply fluctuations

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the wiring connected to the outdoor unit board.

  2. 2

    Ensure the power supply is stable.

  3. 3

    If the issue persists, the outdoor board may need replacement.

Browse all codes in this manual (170)
Verified technical data. Last updated: April 2026

Related Faults

0.5-second ON / 0.5-second OFF blinkUpper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error00Normal operation - No error codes1 beep during error display mode1 beep during error display mode - Unit has an error (different code)
Source: Mitsubishi Electric Air Conditioning
Open Manual (Page 19)Search more codes in this manual