Chapter 8
Troubleshooting Based on Observed Symptoms
8-1
8-1-1
The LCD Does Not Light Up. .................................................................................................................. 1
8-1-2
8-1-3
8-1-4
8-2
8-2-1
The LCD Does Not Light Up. .................................................................................................................. 5
8-2-2
8-2-3
"HO" or "Waiting for ···" Does Not Go Off the Screen............................................................................. 7
8-2-4
8-3
8-3-1
8-3-2
8-3-3
8-4
8-4-1
M-NET................................................................................................................................................... 15
8-4-2
MA Remote Controller .......................................................................................................................... 17
8-5
8-5-1
8-5-2
High-Pressure Sensor Configuration (Outdoor unit, HBC) (63HS1, PS1, PS3) ................................... 19
8-5-3
8-5-4
8-5-5
8-6
8-7
Troubleshooting Outdoor Unit Fan Problems.................................................................................. 23
8-8
Troubleshooting LEV, FCV Problems ............................................................................................... 24
8-8-1
General Overview on LEV Operation (Outdoor unit) ............................................................................ 24
8-8-2
General Overview on LEV Operation (HBC)......................................................................................... 27
8-8-3
8-8-4
8-8-5
Coil Removal Instructions ..................................................................................................................... 32
8-9
8-9-1
Pressure Sensor ................................................................................................................................... 34
8-9-2
Temperature Sensor ............................................................................................................................. 36
8-9-3
8-9-4
Water Pump Control ............................................................................................................................. 39
8-10
8-10-2 Checking the Inverter Board Error Detection Circuit............................................................................. 42
8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems ........................................ 42
GB_BS_08_L