Arrived onsite to investigate a no-heat issue on a Mitsubishi 1-to-1 mini split system. The outdoor unit was displaying a 10-blink error code (system protection fault). Refrigerant pressures were found to be low, which would cause this fault. I checked for leaks at the indoor unit, outdoor unit, and all flare connections but was unable to locate any visible leaks. Given that the unit is approximately four years old, this appears to be a very small refrigerant leak. Provided estimates to recover the refrigerant, add sealant, recharge the system, and perform an annual tune-up. The customer was also interested in comparing pricing for unit replacement; we will follow up with an estimate.
