I am a home service technician, and I recently completed a job for a customer who was experiencing issues with their air conditioning system. The customer had a Mitsubishi split system, and the condenser unit was not cooling properly. After inspecting the system, I found that the thermistors and temperature sensor were faulty. I replaced all four thermistors and tested the system, and it is now operating properly. If the issue reoccurs, I will need to call Mitsubishi to inspect the system.