CodeRegistry
Brands
  1. Home
  2. Mitsubishi Electric
  3. MSZ-AP Air Conditioners
  4. Dim Indicator, No Beep
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.

Dim Indicator, No Beep

Operation indicator lamp is dim and unit does not beep - NIGHT MODE activated

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Dim Indicator, No Beep mean?

The operation indicator lamp on the indoor unit appears dim, and the unit does not produce beep sounds when operating (except for start or stop actions).

Common Causes

  • NIGHT MODE is currently active on the air conditioner.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press the NIGHT MODE button on your remote controller again to deactivate NIGHT MODE.

  2. 2

    Check the remote controller's display to confirm that NIGHT MODE is no longer active.

  3. 3

    If you prefer a brighter indicator lamp and audible beep sounds for all operations, ensure NIGHT MODE remains off.

Browse all codes in this manual (87)
Verified technical data. Last updated: April 2026

Related Faults

3 Min Restart DelayUnit cannot be operated for about 3 minutes after restart - Microprocessor protection3 Short Beeps3 short beeps from indoor unit - Weekly timer setting failedAP Mode activatedNET and MODE LEDs flashing (every 5 seconds) - Access Point Mode activated
Source: Mitsubishi Electric MSZ-AP Air Conditioners
Open Manual (Page 17)Search more codes in this manual