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STANDBY

STANDBY displayed on remote control — Refrigerant oil protection control is active

Mitsubishi Heavy Industries · Packaged Air Conditioners

What does STANDBY mean?

The remote control displays 'STANDBY' for up to 30 minutes after the first power-up following a breaker power supply input or recovery from a power failure. This is not a failure but a normal refrigerant oil protection control to safeguard the compressor.

Common Causes

  • Initial power-up of the unit.
  • Power failure and subsequent recovery.
  • Breaker power supply input.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Do not attempt to operate the unit; this is a normal protection cycle.

  2. 2

    Wait patiently for up to 30 minutes for the 'STANDBY' display to turn off automatically.

  3. 3

    Allow the unit to complete its refrigerant oil protection control before resuming normal operation.

  4. 4

    If 'STANDBY' persists for longer than 30 minutes or does not clear, consult your dealer for further assistance.

  5. 5

    Ensure stable power supply to prevent frequent power interruptions.

Browse all codes in this manual (21)
Verified technical data. Last updated: April 2026

Related Faults

Abnormal Compressor NoiseCompressor Making Abnormal Sound or Vibrating — Indicates a serious internal issueAbnormal DisplayAbnormal Display on Electric Component Box/Control Panel — Indicates an electrical issueAbnormal Fan NoiseFan Making Abnormal Sound or Vibrating — Indicates an internal issue
Source: Mitsubishi Heavy Industries Packaged Air Conditioners
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