Mitsubishi Electric R410A Service Handbook page 9

CONTENTS
Chapter 8 Troubleshooting Based on Observed Symptoms
8-1 MA Remote Controller Problems ...................................................................................................... 237
8-2 ME remote Controller Problems ....................................................................................................... 241
8-3 Refrigerant Control Problems ........................................................................................................... 245
8-4 Checking Transmission Waveform and for Electrical Noise Interference .................................... 250
8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ........ 253
8-6 Troubleshooting Solenoid Valve Problems .....................................................................................255
8-7 Troubleshooting Outdoor Unit Fan Problems ................................................................................. 257
8-8 Troubleshooting LEV Problems........................................................................................................ 258
8-9 Troubleshooting Inverter Problems (TLMU) ....................................................................................264
8-10 Troubleshooting Inverter Problems (YLMU) .................................................................................... 276
8-11 Control Circuit (TLMU) ....................................................................................................................... 285
8-12 Control Circuit (YLMU)....................................................................................................................... 290
8-13 Measures for Refrigerant Leakage ................................................................................................... 293
8-14 Compressor Replacement Instructions ........................................................................................... 295
8-15 Heat exchanger Replacement Instructions...................................................................................... 297
8-16 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ..................... 298
Chapter 9 LED Status Indicators on the Outdoor Unit Circuit Board
9-1 LED Status Indicators ........................................................................................................................ 301
9-2 LED Status Indicators Table............................................................................................................. 304
HWE14080 GB