P0299 The OBD-II code P0299 signifies a "Turbocharger/Supercharger A Underboost Condition," meaning the turbocharger isn't producing enough boost pressure for the engine. This is often caused by a leak in the boost system, a faulty turbocharger or actuator, a restricted air filter or diesel particulate filter, or a bad boost pressure sensor. Symptoms include loss of engine power and an illuminated check engine light. This video explains how to diagnose and fix a P0299 code: Common causes of P029

At MRCOOL, we don't expect you to have problems with your unit, but if you ever do see an error code, it's good to at least have some idea of what is going on. Here is what you need to know about the E3 Error Code. MRCOOL Phone Number: 270-366-0457 List of possible MRCOOL Error Codes: E0 - Indoor unit EEPROM parameter error E1 - Indoor / outdoor units communication error E2 - Zero-crossing signal detection error E3 - Indoor fan speed has been out of control E4 - Indoor room temperature sensor T1