CodeRegistry
Brands
  1. Home
  2. Mitsubishi Heavy Industries
  3. R410A Systems
  4. F1
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.

F1

F1 - Reverse phase detected

Mitsubishi Heavy Industries · R410A Systems

What does F1 mean?

The outdoor unit has detected that the electrical phases are reversed. This indicates an issue with the power supply wiring to the outdoor unit.

Common Causes

  • Incorrect electrical wiring to the outdoor unit.
  • Reverse phasing of the main power supply.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the main power supply to the unit at the circuit breaker.

  2. 2

    Wait for at least 30 seconds before turning the power back on.

  3. 3

    If the error persists, contact a qualified electrician to inspect the power supply wiring for correct phasing.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

E0E0 - Transmitting/receiving signal errorE12E12 - Auto address setting error or unit addressed at factory settingE14E14 (Flashes 3 times) - Master/slave system control wiring error
Source: Mitsubishi Heavy Industries R410A Systems
Open Manual (Page 1)Search more codes in this manual