4 🟡 Repair Required

Mitsubishi Error Code 4: Inverter Error

⚠️ Your Mitsubishi HVAC system has an inverter error and needs professional attention.

How to Fix Mitsubishi Code 4

  1. Step 1: Turn off your HVAC system at the thermostat and the circuit breaker.
  2. Step 2: Check and replace your air filter if it's dirty.
  3. Step 3: Call a professional HVAC technician to diagnose and repair the issue.
Type: led blink count Display: indoor unit led

What Does Mitsubishi Error Code 4 Mean?

The Mitsubishi 4 error indicates a problem with your system's inverter, which controls the speed of the compressor. This error can be caused by a variety of issues, but it's important to note that it's not an immediate safety hazard. However, it's crucial to address this issue promptly to prevent further damage to your system.

Common Causes of Mitsubishi Code 4

  • Faulty inverter board
  • Low refrigerant level
  • Dirty or clogged filter
  • Wiring issues or poor electrical connection

Applicable Mitsubishi Models

City Multi (VRF)⚡City Multi (Y)⚡Diamond (PJ)⚡Diamond Plus⚡Diamond Series⚡Ducted Systems⚡M-Series⚡MSZ⚡MSZ Series⚡MSZ-AP⚡MSZ-AP Series⚡MSZ-AP5 Series⚡MSZ-AS⚡MSZ-FD⚡MSZ-FE⚡MSZ-FS⚡MSZ-FS/FD Series⚡MSZ-FT⚡MSZ-FY⚡MSZ-GE⚡MSZ-LV⚡MUZ-FE Series⚡P-Series⚡PUMA⚡PUMY⚡Puff (P-Series)⚡
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Replacement Parts for Mitsubishi Mini-Split Code 4

Inverter board OEM: 505489-0000