U1 🟡 Repair Required

Mitsubishi Error Code U1: High Pressure Trip

⚠️ Your Mitsubishi HVAC system has experienced a high pressure trip. It's safe to operate, but you should schedule a professional repair soon.

How to Fix Mitsubishi Code U1

  1. Check and replace your air filter if it's dirty.
  2. Turn off your HVAC system and wait for the pressure to equalize (about 24 hours).
  3. If the system still doesn't work, call a professional HVAC technician.
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What Does Mitsubishi Error Code U1 Mean?

The U1 error code on your Mitsubishi HVAC system indicates that the high pressure switch has been activated, causing the system to shut down. This is a safety feature designed to prevent damage to the compressor. The most common causes of this error are a refrigerant leak, a faulty expansion valve, or a clogged air filter.

Common Causes of Mitsubishi Code U1

  • Refrigerant leak
  • Faulty expansion valve
  • Clogged air filter
  • Dirty evaporator coil

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 U1

High pressure switch OEM: 510140-0000
Expansion valve OEM: 510180-0000
Refrigerant