Please read all of the instructions before using the air conditioner and keep this manual for future reference. The air conditioner you purchased has R410a gas refrigerant a environmental friendly gas which does not damage the ozone layer. Westinghouse Air Conditioner Error Codes Error signals on the display: In case of error, the display on the indoor unit shown the following error codes: Error Codes Description of the trouble 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 Open circuit or short circuit of indoor room temperature T1 sensor. E5 Open circuit or short circuit of evaporator coil temperature T2 sensor EC Refrigerant Leakage Detection F1 Open circuit or short circuit of outdoor ambient T4 temperature sensor F2 Open circuit or short circuit of condenser coil temperature T3 sensor F3 Open circuit or short circuit of compressor d...